194 results on '"Crevoisier, Cyril"'
Search Results
2. Overview and Status of the Methane Remote Sensing Lidar Mission: MERLIN
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Arnold, Sabrina G., primary, Ehret, Gerhard, additional, Alpers, Matthias, additional, Bès, Caroline, additional, Bousquet, Philippe, additional, Crevoisier, Cyril, additional, Fix, Andreas, additional, Millet, Bruno, additional, and Wirth, Martin, additional
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- 2023
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3. A full physics algorithm to retrieve nighttime sea surface temperature with IASI: Toward an independent homogeneous long time-series for climate studies
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Capelle, Virginie, Hartmann, Jean-Michel, and Crevoisier, Cyril
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- 2022
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4. Improving Error Estimates for Evaluating Satellite-Based Atmospheric CO 2 Measurement Concepts through Numerical Simulations.
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Silveira, Bruna Barbosa, Cassé, Vincent, Chomette, Olivier, and Crevoisier, Cyril
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ATMOSPHERIC carbon dioxide ,CARBON emissions ,CARBON dioxide ,COMPUTER simulation ,AEROSOLS ,ESTIMATES ,KALMAN filtering - Abstract
To assess the accuracy of satellite monitoring of anthropogenic CO 2 emissions, inversions of satellite data in SWIR are usually combined with the assimilation of the total CO 2 column into a Kalman filter that reconstructs the sources and sinks of atmospheric CO 2 . To provide error estimates of the total CO 2 column for multi-month assimilation experiments of simulated satellite data, we parametrise these errors using linear regressions. These regression are obtained from a database that links meteorological situations, albedos, and aerosols to the errors in the inversion of the total CO 2 column based on simulated satellite data for those conditions. The errors in this database are explicitly computed using the Bayesian estimation formalism, and the linear regressions are optimised by selecting appropriate predictors and predictants. For different levels of measurement noise, error simulations are performed over a period of several months using the albedo and aerosol data from MODIS. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Greenhouse Effect : The Relative Contributions of Emission Height and Total Absorption
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Dufresne, Jean-Louis, Eymet, Vincent, Crevoisier, Cyril, and Grandpeix, Jean-Yves
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- 2020
6. Variability and quasi-decadal changes in the methane budget over the period 2000–2012
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Saunois, Marielle, Bousquet, Philippe, Poulter, Ben, Peregon, Anna, Ciais, Philippe, Canadell, Josep G, Dlugokencky, Edward J, Etiope, Giuseppe, Bastviken, David, Houweling, Sander, Janssens-Maenhout, Greet, Tubiello, Francesco N, Castaldi, Simona, Jackson, Robert B, Alexe, Mihai, Arora, Vivek K, Beerling, David J, Bergamaschi, Peter, Blake, Donald R, Brailsford, Gordon, Bruhwiler, Lori, Crevoisier, Cyril, Crill, Patrick, Covey, Kristofer, Frankenberg, Christian, Gedney, Nicola, Höglund-Isaksson, Lena, Ishizawa, Misa, Ito, Akihiko, Joos, Fortunat, Kim, Heon-Sook, Kleinen, Thomas, Krummel, Paul, Lamarque, Jean-François, Langenfelds, Ray, Locatelli, Robin, Machida, Toshinobu, Maksyutov, Shamil, Melton, Joe R, Morino, Isamu, Naik, Vaishali, O'Doherty, Simon, Parmentier, Frans-Jan W, Patra, Prabir K, Peng, Changhui, Peng, Shushi, Peters, Glen P, Pison, Isabelle, Prinn, Ronald, Ramonet, Michel, Riley, William J, Saito, Makoto, Santini, Monia, Schroeder, Ronny, Simpson, Isobel J, Spahni, Renato, Takizawa, Atsushi, Thornton, Brett F, Tian, Hanqin, Tohjima, Yasunori, Viovy, Nicolas, Voulgarakis, Apostolos, Weiss, Ray, Wilton, David J, Wiltshire, Andy, Worthy, Doug, Wunch, Debra, Xu, Xiyan, Yoshida, Yukio, Zhang, Bowen, Zhang, Zhen, and Zhu, Qiuan
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Earth Sciences ,Atmospheric Sciences ,Climate Action ,Astronomical and Space Sciences ,Meteorology & Atmospheric Sciences ,Atmospheric sciences ,Climate change science - Abstract
Following the recent Global Carbon Project (GCP) synthesis of the decadal methane (CH4) budget over 2000-2012 (Saunois et al., 2016), we analyse here the same dataset with a focus on quasi-decadal and inter-annual variability in CH4 emissions. The GCP dataset integrates results from top-down studies (exploiting atmospheric observations within an atmospheric inverse-modelling framework) and bottom-up models (including process-based models for estimating land surface emissions and atmospheric chemistry), inventories of anthropogenic emissions, and data-driven approaches. The annual global methane emissions from top-down studies, which by construction match the observed methane growth rate within their uncertainties, all show an increase in total methane emissions over the period 2000-2012, but this increase is not linear over the 13 years. Despite differences between individual studies, the mean emission anomaly of the top-down ensemble shows no significant trend in total methane emissions over the period 2000-2006, during the plateau of atmospheric methane mole fractions, and also over the period 2008-2012, during the renewed atmospheric methane increase. However, the top-down ensemble mean produces an emission shift between 2006 and 2008, leading to 22 [16-32]Tg CH4yr-1 higher methane emissions over the period 2008-2012 compared to 2002-2006. This emission increase mostly originated from the tropics, with a smaller contribution from mid-latitudes and no significant change from boreal regions. The regional contributions remain uncertain in top-down studies. Tropical South America and South and East Asia seem to contribute the most to the emission increase in the tropics. However, these two regions have only limited atmospheric measurements and remain therefore poorly constrained. The sectorial partitioning of this emission increase between the periods 2002-2006 and 2008-2012 differs from one atmospheric inversion study to another. However, all top-down studies suggest smaller changes in fossil fuel emissions (from oil, gas, and coal industries) compared to the mean of the bottom-up inventories included in this study. This difference is partly driven by a smaller emission change in China from the top-down studies compared to the estimate in the Emission Database for Global Atmospheric Research (EDGARv4.2) inventory, which should be revised to smaller values in a near future. We apply isotopic signatures to the emission changes estimated for individual studies based on five emission sectors and find that for six individual top-down studies (out of eight) the average isotopic signature of the emission changes is not consistent with the observed change in atmospheric 13CH4. However, the partitioning in emission change derived from the ensemble mean is consistent with this isotopic constraint. At the global scale, the top-down ensemble mean suggests that the dominant contribution to the resumed atmospheric CH4 growth after 2006 comes from microbial sources (more from agriculture and waste sectors than from natural wetlands), with an uncertain but smaller contribution from fossil CH4 emissions. In addition, a decrease in biomass burning emissions (in agreement with the biomass burning emission databases) makes the balance of sources consistent with atmospheric 13CH4 observations. In most of the top-down studies included here, OH concentrations are considered constant over the years (seasonal variations but without any inter-annual variability). As a result, the methane loss (in particular through OH oxidation) varies mainly through the change in methane concentrations and not its oxidants. For these reasons, changes in the methane loss could not be properly investigated in this study, although it may play a significant role in the recent atmospheric methane changes as briefly discussed at the end of the paper.
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- 2017
7. The Global Methane Budget: 2000–2012
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Saunois, Marielle, Bousquet, Philippe, Poulter, Ben, Peregon, Anna, Ciais, Philippe, Canadell, Josep G, Dlugokencky, Edward J, Etiope, Giuseppe, Bastviken, David, Houweling, Sander, Janssens-Maenhout, Greet, Tubiello, Francesco N, Castaldi, Simona, Jackson, Robert B, Alexe, Mihai, Arora, Vivek K, Beerling, David J, Bergamaschi, Peter, Blake, Donald R, Brailsford, Gordon, Brovkin, Victor, Bruhwiler, Lori, Crevoisier, Cyril, Crill, Patrick, Curry, Charles, Frankenberg, Christian, Gedney, Nicola, Höglund-Isaksson, Lena, Ishizawa, Misa, Ito, Akihiko, Joos, Fortunat, Kim, Heon-Sook, Kleinen, Thomas, Krummel, Paul, Lamarque, Jean-François, Langenfelds, Ray, Locatelli, Robin, Machida, Toshinobu, Maksyutov, Shamil, McDonald, Kyle C, Marshall, Julia, Melton, Joe R, Morino, Isamu, O'Doherty, Simon, Parmentier, Frans-Jan W, Patra, Prabir K, Peng, Changhui, Peng, Shushi, Peters, Glen P, Pison, Isabelle, Prigent, Catherine, Prinn, Ronald, Ramonet, Michel, Riley, William J, Saito, Makoto, Schroeder, Ronny, Simpson, Isobel J, Spahni, Renato, Steele, Paul, Takizawa, Atsushi, Thornton, Brett F, Tian, Hanqin, Tohjima, Yasunori, Viovy, Nicolas, Voulgarakis, Apostolos, van Weele, Michiel, van der Werf, Guido, Weiss, Ray, Wiedinmyer, Christine, Wilton, David J, Wiltshire, Andy, Worthy, Doug, Wunch, Debra B, Xu, Xiyan, Yoshida, Yukio, Zhang, Bowen, Zhang, Zhen, and Zhu, Qiuan
- Abstract
Abstract. The global methane (CH4) budget is becoming an increasingly important component for managing realistic pathways to mitigate climate change. This relevance, due to a shorter atmospheric lifetime and a stronger warming potential than carbon dioxide, is challenged by the still unexplained changes of atmospheric CH4 over the past decade. Emissions and concentrations of CH4 are continuing to increase making CH4 the second most important human-induced greenhouse gas after carbon dioxide. Two major difficulties in reducing uncertainties come from the large variety of diffusive CH4 sources that overlap geographically, and from the destruction of CH4 by the very short-lived hydroxyl radical (OH). To address these difficulties, we have established a consortium of multi-disciplinary scientists under the umbrella of the Global Carbon Project to synthesize and stimulate research on the methane cycle, and producing regular (~biennial) updates of the global methane budget. This consortium includes atmospheric physicists and chemists, biogeochemists of surface and marine emissions, and socio-economists who study anthropogenic emissions. Following Kirschke et al. (2013), we propose here the first version of a living review paper that integrates results of top-down studies (T-D, exploiting atmospheric observations within an atmospheric inverse-modelling framework) and bottom-up models, inventories, and data-driven approaches (B-U, including process-based models for estimating land surface emissions and atmospheric chemistry, and inventories for anthropogenic emissions, data-driven extrapolations). For the 2003–2012 decade, global methane emissions are estimated by T-D inversions at 558 Tg CH4 yr−1 (range [540–568]). About 60 % of global emissions are anthropogenic (range [50–65 %]). B-U approaches suggest larger global emissions (736 Tg CH4 yr−1 [596–884]) mostly because of larger natural emissions from individual sources such as inland waters, natural wetlands and geological sources. Considering the atmospheric constraints on the T-D budget, it is likely that some of the individual emissions reported by the B-U approaches are overestimated, leading to too large global emissions. Latitudinal data from T-D emissions indicate a predominance of tropical emissions (~64 % of the global budget,
- Published
- 2016
8. Synthetic mapping of XCO2 retrieval performance from shortwave infrared measurements: impact of spectral resolution, signal-to-noise ratio and spectral band selection
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Dogniaux, Matthieu, primary and Crevoisier, Cyril, additional
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- 2023
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9. Supplementary material to "Synthetic mapping of XCO2 retrieval performance from shortwave infrared measurements: impact of spectral resolution, signal-to-noise ratio and spectral band selection"
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Dogniaux, Matthieu, primary and Crevoisier, Cyril, additional
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- 2023
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10. Structure and Dynamical Influence of Water Vapor in the Lower Tropical Troposphere
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Stevens, Bjorn, Brogniez, Hélène, Kiemle, Christoph, Lacour, Jean-Lionel, Crevoisier, Cyril, Kiliani, Johannes, Pincus, Robert, editor, Winker, David, editor, Bony, Sandrine, editor, and Stevens, Bjorn, editor
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- 2018
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11. Synthetic mapping of XCO2 retrieval performance from shortwave infrared measurements: impact of spectral resolution, signal-to-noise ratio and spectral band selection.
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Dogniaux, Matthieu and Crevoisier, Cyril
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ATMOSPHERIC layers , *SIGNAL-to-noise ratio , *INFRARED spectra , *MEASUREMENT ,PARIS Agreement (2016) - Abstract
Satellites have been providing spaceborne observations of the total column of CO2 (noted xco2) for over two decades now and, with the need for independent verification of Paris Agreement objectives, many new satellite concepts are currently planned or being studied to complement or extend the already existing instruments. Depending on whether they are targeting natural and/or anthropogenic fluxes of CO2, the design of these future concepts vary greatly. The characteristics of their shortwave infrared (SWIR) observations notably explore several orders of magnitude in spectral resolution (from λ/Δλ~400 for Carbon Mapper to λ/Δλ~25000 for MicroCarb) and include different selections of spectral bands (from one to four bands, among which the CO2-sensitive 1.6 µm and/or 2.05 µm bands). Besides, the very nature of the spaceborne measurements is also explored: for instance, the NanoCarb imaging concept proposes to measure CO2-sensitive truncated interferograms, instead of infrared spectra as other concepts, in order to significantly reduce the instrument size. This study synthetically explores the impact of three different design parameters on xco2 retrieval performance, as obtained through Optimal Estimation: (1) the spectral resolution; (2) the signal-to-noise ratio (SNR) and (3) the spectral band selection. Similar performance assessments are completed for the exactly-defined MicroCarb, Copernicus CO2 Monitoring (CO2M) and NanoCarb concepts. We show that improving SNR is more efficient than improving spectral resolution to increase xco2 precision when perturbating these parameters across two orders of magnitude, and that low-SNR and/or low spectral resolution yield xco2 with vertical sensitivities giving more weight to atmospheric layers close to the surface. The exploration of various spectral band combinations illustrates, especially for lower spectral resolutions, how including an O2- sensitive band helps to increase optical path length information, and how the 2.05 µm CO2-sensitive band contains more geophysical information than the 1.6 µm band. With very different characteristics, MicroCarb shows a CO2 information content only slightly higher than CO2M, which translates into lower xco2 random errors, by a factor ranging from 1.1 to 1.9 depending on the observational situation. The NanoCarb performance for a single pixel of its imager compares to concepts that measure spectra at low-SNR and low-spectral resolution but, as this novel concept would observe a given target several times during a single overpass, its performance improves when combining all the observations. Overall, the broad range of results obtained through this synthetic xco2 performance mapping hints at the future intercomparison challenges that the wide variety of upcoming CO2-observing concepts will pose. [ABSTRACT FROM AUTHOR]
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- 2023
12. Technical note: The CAMS greenhouse gas reanalysis from 2003 to 2020
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Agustí-Panareda, Anna, primary, Barré, Jérôme, additional, Massart, Sébastien, additional, Inness, Antje, additional, Aben, Ilse, additional, Ades, Melanie, additional, Baier, Bianca C., additional, Balsamo, Gianpaolo, additional, Borsdorff, Tobias, additional, Bousserez, Nicolas, additional, Boussetta, Souhail, additional, Buchwitz, Michael, additional, Cantarello, Luca, additional, Crevoisier, Cyril, additional, Engelen, Richard, additional, Eskes, Henk, additional, Flemming, Johannes, additional, Garrigues, Sébastien, additional, Hasekamp, Otto, additional, Huijnen, Vincent, additional, Jones, Luke, additional, Kipling, Zak, additional, Langerock, Bavo, additional, McNorton, Joe, additional, Meilhac, Nicolas, additional, Noël, Stefan, additional, Parrington, Mark, additional, Peuch, Vincent-Henri, additional, Ramonet, Michel, additional, Razinger, Miha, additional, Reuter, Maximilian, additional, Ribas, Roberto, additional, Suttie, Martin, additional, Sweeney, Colm, additional, Tarniewicz, Jérôme, additional, and Wu, Lianghai, additional
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- 2023
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13. The first balloon-borne sample analysis of atmospheric carbonaceous components reveals new insights into formation processes
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Benoit, Roland, primary, Vernier, Hazel, additional, Vernier, Jean-Paul, additional, Joly, Lilian, additional, Dumelié, Nicolas, additional, Wienhold, Frank G., additional, Crevoisier, Cyril, additional, Delpeux, Sandrine, additional, Bernard, François, additional, Dagaut, Philippe, additional, and Berthet, Gwenaël, additional
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- 2023
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14. Natural methane emissions at high latitudes: A study through the MAGIC2021 measurements campaign
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Langot, Félix, primary, Crevoisier, Cyril, additional, Lauvaux, Thomas, additional, Guedj, Axel, additional, Pernin, Jérôme, additional, Berchet, Antoine, additional, Pison, Isabelle, additional, and Wittig, Sophie, additional
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- 2023
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15. Airborne in-situ observations of natural methane emissions in Scandinavia during MAGIC 2021
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Gottschaldt, Klaus-Dirk, primary, Crevoisier, Cyril, additional, Fiehn, Alina, additional, Fix, Andreas, additional, Hartung, Kerstin, additional, Huntrieser, Heidi, additional, Jöckel, Patrick, additional, Kern, Bastian, additional, Kostinek, Julian, additional, Markkanen, Tiina, additional, Mertens, Mariano, additional, Middleton, Callum, additional, Pühl, Magdalena, additional, Quatrevalet, Mathieu, additional, Wooster, Martin, additional, and Roiger, Anke, additional
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- 2023
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16. Evaluation of spectroscopic databases through radiative transfer simulations compared to observations. Application to the validation of GEISA 2015 with IASI and TCCON
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Armante, Raymond, Scott, Noelle, Crevoisier, Cyril, Capelle, Virginie, Crepeau, Laurent, Jacquinet, Nicole, and Chédin, Alain
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- 2016
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17. Airborne in-situ observations of natural methane emissions in Scandinavia during MAGIC 2021
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Gottschaldt, Klaus-Dirk, Crevoisier, Cyril, Fiehn, Alina, Fix, Andreas, Hartung, Kerstin, Huntrieser, Heidi, Jöckel, Patrick, Kern, Bastian, Kostinek, Julian, Markkanen, Tina, Mertens, Mariano, Middleton, Callum, Pühl, Magdalena, Quatrevalet, Mathieu, Wooster, Martin, and Roiger, Anke-Elisabeth
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methane ,airborne measurements ,wetlands - Published
- 2023
18. Structure and Dynamical Influence of Water Vapor in the Lower Tropical Troposphere
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Stevens, Bjorn, Brogniez, Hélène, Kiemle, Christoph, Lacour, Jean-Lionel, Crevoisier, Cyril, and Kiliani, Johannes
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- 2017
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19. Synergetic use of IASI profile and TROPOMI total-column level 2 methane retrieval products
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Schneider, Matthias, Ertl, Benjamin, Tu, Qiansi, Diekmann, Christopher J., Khosrawi, Farahnaz, Röhling, Amelie N., Hase, Frank, Dubravica, Darko, García, Omaira E., Sepúlveda, Eliezer, Borsdorff, Tobias, Landgraf, Jochen, Lorente, Alba, Butz, André, Chen, Huilin, Kivi, Rigel, Laemmel, Thomas, Ramonet, Michel, Crevoisier, Cyril, Pernin, Jérome, Steinbacher, Martin, Meinhardt, Frank, Strong, Kimberly, Wunch, Debra, Warneke, Thorsten, Roehl, Coleen, Wennberg, Paul O., Morino, Isamu, Iraci, Laura T., Shiomi, Kei, Deutscher, Nicholas M., Griffith, David W.T., Velazco, Voltaire A., Pollard, David F., Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), ICOS-RAMCES (ICOS-RAMCES), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Isotope Research
- Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,Earth sciences ,IASI ,Infrared Atmospheric Sounding Interferometer ,ddc:550 ,Tropospheric Monitoring Instrument ,Atmospheric trace gas ,TROPOMI ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment ,Methane - Abstract
The thermal infrared nadir spectra of IASI (Infrared Atmospheric Sounding Interferometer) are successfully used for retrievals of different atmospheric trace gas profiles. However, these retrievals offer generally reduced information about the lowermost tropospheric layer due to the lack of thermal contrast close to the surface. Spectra of scattered solar radiation observed in the near-infrared and/or shortwave infrared, for instance by TROPOMI (TROPOspheric Monitoring Instrument), offer higher sensitivity near the ground and are used for the retrieval of total-column-averaged mixing ratios of a variety of atmospheric trace gases. Here we present a method for the synergetic use of IASI profile and TROPOMI total-column level 2 retrieval products. Our method uses the output of the individual retrievals and consists of linear algebra a posteriori calculations (i.e. calculation after the individual retrievals). We show that this approach has strong theoretical similarities to applying the spectra of the different sensors together in a single retrieval procedure but with the substantial advantage of being applicable to data generated with different individual retrieval processors, of being very time efficient, and of directly benefiting from the high quality and most recent improvements of the individual retrieval processors. We demonstrate the method exemplarily for atmospheric methane (CH4). We perform a theoretical evaluation and show that the a posteriori combination method yields a total-column-averaged CH4 product (XCH4) that conserves the good sensitivity of the corresponding TROPOMI product while merging it with the high-quality upper troposphere–lower stratosphere (UTLS) CH4 partial-column information of the corresponding IASI product. As a consequence, the combined product offers additional sensitivity for the tropospheric CH4 partial column, which is not provided by the individual TROPOMI nor the individual IASI product. The theoretically predicted synergetic effect is verified by comparisons to CH4 reference data obtained from collocated XCH4 measurements at 14 globally distributed TCCON (Total Carbon Column Observing Network) stations, CH4 profile measurements made by 36 individual AirCore soundings, and tropospheric CH4 data derived from continuous ground-based in situ observations made at two nearby Global Atmospheric Watch (GAW) mountain stations. The comparisons clearly demonstrate that the combined product can reliably detect the actual variations of atmospheric XCH4, CH4 in the UTLS, and CH4 in the troposphere. A similar good reliability for the latter is not achievable by the individual TROPOMI and IASI products.
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- 2022
20. The Space Carbon Observatory (SCARBO) concept: assessment of XCO2 and XCH4 retrieval performance
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Dogniaux, Matthieu, primary, Crevoisier, Cyril, additional, Gousset, Silvère, additional, Le Coarer, Étienne, additional, Ferrec, Yann, additional, Croizé, Laurence, additional, Wu, Lianghai, additional, Hasekamp, Otto, additional, Sic, Bojan, additional, and Brooker, Laure, additional
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- 2022
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21. Technical note: The CAMS greenhouse gas reanalysis from 2003 to 2020
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Agusti-Panareda, Anna, primary, Barré, Jérôme, additional, Massart, Sébastien, additional, Inness, Antje, additional, Aben, Ilse, additional, Ades, Melanie, additional, Baier, Bianca C., additional, Balsamo, Gianpaolo, additional, Borsdorff, Tobias, additional, Bousserez, Nicolas, additional, Boussetta, Souhail, additional, Buchwitz, Michael, additional, Cantarello, Luca, additional, Crevoisier, Cyril, additional, Engelen, Richard, additional, Eskes, Henk, additional, Flemming, Johannes, additional, Garrigues, Sébastien, additional, Hasekamp, Otto, additional, Huijnen, Vincent, additional, Jones, Luke, additional, Kipling, Zak, additional, Langerock, Bavo, additional, McNorton, Joe, additional, Meilhac, Nicolas, additional, Noel, Stefan, additional, Parrington, Mark, additional, Peuch, Vincent-Henri, additional, Ramonet, Michel, additional, Ratzinger, Miha, additional, Reuter, Maximilian, additional, Ribas, Roberto, additional, Suttie, Martin, additional, Sweeney, Colm, additional, Tarniewicz, Jérôme, additional, and Wu, Lianghai, additional
- Published
- 2022
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22. Computation of longwave radiative flux and vertical heating rate with 4A-Flux v1.0 as an integral part of the radiative transfer code 4A/OP v1.5
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Tellier, Yoann, primary, Crevoisier, Cyril, additional, Armante, Raymond, additional, Dufresne, Jean-Louis, additional, and Meilhac, Nicolas, additional
- Published
- 2022
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23. The Adaptable 4A Inversion (5AI): description and first XCO2 retrievals from Orbiting Carbon Observatory-2 (OCO-2) observations
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DOGNIAUX, Matthieu, CREVOISIER, Cyril, ARMANTE, Raymond, CAPELLE, Virginie, DELAHAYE, Thibault, CASSE, Vincent, DE, MAZIERE Martine, DEUTSCHER, Nicholas M., FEIST, Dietrich G., GARCIA, Omaira E., GRIFFITH, David W. T., HASE, Frank, IRACI, Laura T., KIVI, Rigel, NOTHOLT, Justus, POLLARD, David F., ROEHIColeen, M., MORINO, Isamu, and SHIOMI, Kei
- Abstract
著者人数: 23名, 形態: カラー図版あり, Number of authors: 23, Physical characteristics: Original contains color illustrations, Accepted: 2021-04-18, 資料番号: PA2210073000
- Published
- 2021
24. Structure and Dynamical Influence of Water Vapor in the Lower Tropical Troposphere
- Author
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Stevens, Bjorn, primary, Brogniez, Hélène, additional, Kiemle, Christoph, additional, Lacour, Jean-Lionel, additional, Crevoisier, Cyril, additional, and Kiliani, Johannes, additional
- Published
- 2017
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25. Mission aéroportée Double-Lidar au-dessus de la Scandinavie pour l'évaluation du transport atmosphérique de méthane et de dioxyde de carbone
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Cézard, Nicolas, Valla, Matthieu, Lombard, Laurent, Goular, Didier, Augère, Béa- Trice, Dolfi-Bouteyre, Agnès, Fix, Andreas, Quatrevalet, Mathieu, Bès, Caroline, Crevoisier, Cyril, and WIBAUX, Laurine
- Subjects
CH4 ,Lidar Gaz ,[SPI] Engineering Sciences [physics] ,Airborne ,Doppler ,LIDAR à absorption différentielle - DIAL ,CO2 ,Dial ,Lidar doppler ,Lidar aérien ,[PHYS] Physics [physics] - Abstract
In August 2021 took place in northern Scandinavia the MAGIC-2021 campaign, dedicated to the Monitoring of Atmospheric composition and Greenhouse gases through multi-Instruments Campaigns. Gathering 17 research teams from 7 countries, the campaign involved a large suite of instruments and payloads (ground-based, balloon-borne, and airborne). Among them, an original combination of two airborne lidars was deployed onboard the same aircraft (SAFIRE ATR42): on one side DLR’s CHARM-F direct detection lidar for CH4 and CO2 measurement in IPDA mode (Integrated Path Differential Absorption), and on the other side ONERA’s LIVE coherent lidar for range-resolved vertical wind vector profiles.The scientific goal of this double-lidar experiment was to record greenhouse gas (GHG) concentration and wind data with very good temporal and spatial matching, so as to characterize GHG atmospheric transport and infer regional fluxes. Indeed, the boreal region is known to host significant sources of CH4, either anthropogenic (gas and oil platforms) or natural (wetlands, peat bogs, lakes…). Moreover, high latitudes are generally considered to be a sink for atmospheric CO2, but this effect could be strongly impacted by the rapid warming at these latitudes. However, due to the low population density and harsh environment, the boreal area is poorly covered by in-situ instrumentation. Therefore, airborne measurements appear as a preferred solution in these conditions.The airborne campaign was based in Kiruna (Sweden), and lasted 10 days. Though it suffered from poor weather conditions, six flights were successfully completed by the ATR42 above northern Sweden, Finland, and Norway. CHARM-F and LIVE lidars operated nominally during those flights, collecting hours of data in various sky conditions (clear, haze, broken clouds…). The expected precision of CHARM-F and LIVE lidars were respectively around 0.3% for integrated columns of CH4 and CO2 (10 km-along track averaging) and 0.6 m/s for horizontal wind (2.5 km along-track averaging, for average aerosol load in France). The paper will detail the payload arrangement, and review CHARM-F and LIVE lidars main properties. The data processing work is currently in progress, but selected preliminary results of measured collocated GHG columns and wind profiles will be shown and discussed., En août 2021 a eu lieu dans le nord de la Scandinavie la campagne MAGIC-2021, dédiée à la surveillance de la composition atmosphérique et des gaz à effet de serre à travers des campagnes multi-instruments. Rassemblant 17 équipes de recherche de 7 pays, la campagne impliquait une large gamme d'instruments et de charges utiles (au sol, en ballon et aéroportées). Parmi eux, une combinaison originale de deux lidars aéroportés a été déployée à bord du même avion (SAFIRE ATR42) : d'un côté le lidar à détection directe CHARM-F du DLR pour la mesure du CH4 et du CO2 en mode IPDA (Integrated Path Differential Absorption), et de l'autre côté le lidar cohérent LIVE de l'ONERA pour les profils de vecteur vent verticaux résolus en distance.L'objectif scientifique de cette expérience à double lidar était d'enregistrer des données de concentration de gaz à effet de serre (GES) et de vent avec un très bon appariement temporel et spatial, afin de caractériser le transport atmosphérique des GES et d'en déduire les flux régionaux. En effet, la région boréale est connue pour abriter d'importantes sources de CH4, soit anthropiques (plateformes gazières et pétrolières), soit naturelles (zones humides, tourbières, lacs…). De plus, les hautes latitudes sont généralement considérées comme un puits de CO2 atmosphérique, mais cet effet pourrait être fortement impacté par le réchauffement rapide à ces latitudes. Cependant, en raison de la faible densité de population et de l'environnement hostile, la zone boréale est mal couverte par l'instrumentation in situ. Les mesures aéroportées apparaissent donc comme une solution privilégiée dans ces conditions.La campagne aéroportée était basée à Kiruna (Suède) et a duré 10 jours. Bien qu'il ait souffert de mauvaises conditions météorologiques, six vols ont été effectués avec succès par l'ATR42 au-dessus du nord de la Suède, de la Finlande et de la Norvège. Les lidars CHARM-F et LIVE ont fonctionné nominalement pendant ces vols, collectant des heures de données dans diverses conditions de ciel (clair, brumeux, nuages fragmentés…). La précision attendue des lidars CHARM-F et LIVE était respectivement d'environ 0,3 % pour les colonnes intégrées de CH4 et de CO2 (moyenne de 10 km le long de la trajectoire) et de 0,6 m/s pour le vent horizontal (moyenne de 2,5 km le long de la trajectoire, pour une charge moyenne d'aérosols en France). L'article détaillera l'agencement de la charge utile et passera en revue les principales propriétés des lidars CHARM-F et LIVE. Le travail de traitement des données est actuellement en cours, mais des résultats préliminaires sélectionnés de colonnes de GES et de profils de vent mesurés au même endroit seront présentés et discutés.
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- 2022
26. HYPERSPECTRAL EARTH OBSERVATION FROM IASI : Five Years of Accomplishments
- Author
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Hilton, Fiona, Armante, Raymond, August, Thomas, Barnet, Chris, Bouchard, Aurelie, Camy-Peyret, Claude, Capelle, Virginie, Clarisse, Lieven, Clerbaux, Cathy, Coheur, Pierre-Francois, Collard, Andrew, Crevoisier, Cyril, Dufour, Gaelle, Edwards, David, Faijan, Francois, Fourrié, Nadia, Gambacorta, Antonia, Goldberg, Mitchell, Guidard, Vincent, Hurtmans, Daniel, Illingworth, Samuel, Jacquinet-Husson, Nicole, Kerzenmacher, Tobias, Klaes, Dieter, Lavanant, Lydie, Masiello, Guido, Matricardi, Marco, McNally, Anthony, Newman, Stuart, Pavelin, Edward, Payan, Sebastien, Péquignot, Eric, Peyridieu, Sophie, Phulpin, Thierry, Remedios, John, Schlüssel, Peter, Serio, Carmine, Strow, Larrabee, Stubenrauch, Claudia, Taylor, Jonathan, Tobin, David, Wolf, Walter, and Zhou, Daniel
- Published
- 2012
27. Impact of Meteorological Uncertainties in the Methane Retrieval Ground Segment of the MERLIN Lidar Mission
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Cassé, Vincent, primary, Chomette, Olivier, additional, Crevoisier, Cyril, additional, Gibert, Fabien, additional, Brožková, Radmila, additional, El Khatib, Ryad, additional, and Nahan, Frédéric, additional
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- 2022
- Full Text
- View/download PDF
28. Regional US carbon sinks from three-dimensional atmospheric CO₂ sampling
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Crevoisier, Cyril, Sweeney, Colm, Gloor, Manuel, Sarmiento, Jorge L., Tans, Pieter P., and Law, Bev E.
- Published
- 2010
29. An end-to-end simulator and gas concentration retrieval processor applied to the MERLIN lidar mission to check its performance and study its sensitivity to geophysical parameters
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Cassé, Vincent, Armante, Raymond, Bousquet, Philippe, Chomette, Olivier, Crevoisier, Cyril, Delahaye, Thibault, Edouart, Dimitri, Gibert, Fabien, Millet, Bruno, Nahan, Frédéric, Pierangelo, Clémence, Centre National de la Recherche Scientifique (CNRS), and Gibert, Fabien
- Subjects
[SDE] Environmental Sciences ,[SDE]Environmental Sciences ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2021
30. CH4 IPDA Lidar mission data simulator and processor for MERLIN: prototype development at LMD/CNRS/Ecole Polytechnique
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Olivier Chomette, Armante Raymond, Crevoisier Cyril, Delahaye Thibault, Edouart Dimitri, Gibert Fabien, Nahan Frédéric, and Tellier Yoann
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Physics ,QC1-999 - Abstract
The MEthane Remote sensing Lidar missioN (MERLIN), currently in phase C, is a joint cooperation between France and Germany on the development of a spatial Integrated Path Differential Absorption (IPDA) LIDAR (LIght Detecting And Ranging) to conduct global observations of atmospheric methane. This presentation will focus on the status of a LIDAR mission data simulator and processor developed at LMD (Laboratoire de Météorologie Dynamique), Ecole Polytechnique, France, for MERLIN to assess the performances in realistic observational situations.
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- 2018
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31. Computation of longwave radiative flux and vertical heating rate with 4A-Flux v1.0 as integral part of the radiative transfer code 4A/OP v1.5
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Tellier, Yoann, primary, Crevoisier, Cyril, additional, Armante, Raymond, additional, Dufresne, Jean-Louis, additional, and Meilhac, Nicolas, additional
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- 2021
- Full Text
- View/download PDF
32. Supplementary material to "The Space CARBon Observatory (SCARBO) concept: Assessment of XCO<sub>2</sub> and XCH<sub>4</sub> retrieval performance"
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Dogniaux, Matthieu, primary, Crevoisier, Cyril, additional, Gousset, Silvère, additional, Le Coarer, Étienne, additional, Ferrec, Yann, additional, Croizé, Laurence, additional, Wu, Lianghai, additional, Hasekamp, Otto, additional, Sic, Bojan, additional, and Brooker, Laure, additional
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- 2021
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- View/download PDF
33. The Space CARBon Observatory (SCARBO) concept: Assessment of XCO<sub>2</sub> and XCH<sub>4</sub> retrieval performance
- Author
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Dogniaux, Matthieu, primary, Crevoisier, Cyril, additional, Gousset, Silvère, additional, Le Coarer, Étienne, additional, Ferrec, Yann, additional, Croizé, Laurence, additional, Wu, Lianghai, additional, Hasekamp, Otto, additional, Sic, Bojan, additional, and Brooker, Laure, additional
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- 2021
- Full Text
- View/download PDF
34. Overview of the MAGIC initiative for GHG and future plans
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Crevoisier, Cyril, Bès, Caroline, Joly, Lilian, Té, Yao, Ramonet, Michel, Herbin, Hervé, Catoire, Valéry, Fix, Andreas, Cézard, Nicolas, and Aurélien, Bourdon
- Subjects
Greenhouse gas measurements - Published
- 2021
35. Development and Validation of an End-to-End Simulator and Gas Concentration Retrieval Processor Applied to the MERLIN Lidar Mission
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Cassé, Vincent, primary, Armante, Raymond, additional, Bousquet, Philippe, additional, Chomette, Olivier, additional, Crevoisier, Cyril, additional, Delahaye, Thibault, additional, Edouart, Dimitri, additional, Gibert, Fabien, additional, Millet, Bruno, additional, Nahan, Frédéric, additional, and Pierangelo, Clémence, additional
- Published
- 2021
- Full Text
- View/download PDF
36. Technical note: The CAMS greenhouse gas reanalysis from 2003 to 2020.
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Agustí-Panareda, Anna, Barré, Jérôme, Massart, Sébastien, Inness, Antje, Aben, Ilse, Ades, Melanie, Baier, Bianca C., Balsamo, Gianpaolo, Borsdorff, Tobias, Bousserez, Nicolas, Boussetta, Souhail, Buchwitz, Michael, Cantarello, Luca, Crevoisier, Cyril, Engelen, Richard, Eskes, Henk, Flemming, Johannes, Garrigues, Sébastien, Hasekamp, Otto, and Huijnen, Vincent
- Abstract
The Copernicus Atmosphere Monitoring Service has recently produced a greenhouse gases reanalysis (version egg4) that covers almost two decades from 2003 to 2020 and will be extended in the future. This reanalysis dataset includes carbon dioxide (CO2) and methane (CH4). The reanalysis procedure combines model data with satellite data into a globally complete and consistent dataset using the European Centre for Medium-range Weather Forecasts' Integrated Forecasting System (IFS). This dataset has been carefully evaluated against independent observations to ensure validity and point out deficiencies to the user. The greenhouse gas reanalysis can be used to examine the impact of atmospheric greenhouse gases concentrations on climate change, such as global and regional climate radiative forcing, assess intercontinental transport, and also serve as boundary conditions for regional simulations, among other applications and scientific studies. The caveats associated with changes in assimilated observations and fixed underlying emissions are highlighted, as well as their impact on the estimation of trends and annual growth rates of these long-lived greenhouse gases. [ABSTRACT FROM AUTHOR]
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- 2022
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37. The Adaptable 4A Inversion (5AI): description and first <i>X</i><sub>CO<sub>2</sub></sub> retrievals from Orbiting Carbon Observatory-2 (OCO-2) observations
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Dogniaux, Matthieu, primary, Crevoisier, Cyril, additional, Armante, Raymond, additional, Capelle, Virginie, additional, Delahaye, Thibault, additional, Cassé, Vincent, additional, De Mazière, Martine, additional, Deutscher, Nicholas M., additional, Feist, Dietrich G., additional, Garcia, Omaira E., additional, Griffith, David W. T., additional, Hase, Frank, additional, Iraci, Laura T., additional, Kivi, Rigel, additional, Morino, Isamu, additional, Notholt, Justus, additional, Pollard, David F., additional, Roehl, Coleen M., additional, Shiomi, Kei, additional, Strong, Kimberly, additional, Té, Yao, additional, Velazco, Voltaire A., additional, and Warneke, Thorsten, additional
- Published
- 2021
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38. Benchmark Calculations of Radiative Forcing by Greenhouse Gases
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Crevoisier, Cyril, Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
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[SDE]Environmental Sciences ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2020
39. The Adaptable 4A Inversion (5AI): Description and first XCO2 retrievals from OCO-2 observations
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Dogniaux, Matthieu, Crevoisier, Cyril, Armante, Raymond, Capelle, Virginie, Delahaye, Thibault, Cassé, Vincent, Mazière, Martine, Deutscher, Nicholas M., Feist, Dietrich G., Garcia, Omaira E., Griffith, David W. T., Hase, Frank, Iraci, Laura T., Kivi, Rigel, Morino, Isamu, Notholt, Justus, Pollard, David F., Roehl, Coleen M., Shiomi, Kei, Strong, Kimberly, Té, Yao, Velazco, Voltaire A., and Warneke, Thorsten
- Abstract
A better understanding of greenhouse gas surface sources and sinks is required in order to address the global challenge of climate change. Spaceborne remote estimations of greenhouse gas atmospheric concentrations can offer the global coverage that is necessary to improve the constraint on their fluxes, thus enabling a better monitoring of anthropogenic emissions. In this work, we introduce the Adaptable 4A Inversion (5AI) inverse scheme that aims to retrieve geophysical parameters from any remote sensing observation. The algorithm is based on Bayesian optimal estimation relying on the Operational version of the Automatized Atmospheric Absorption Atlas (4A/OP) radiative transfer forward model along with the Gestion et Étude des Informations Spectroscopiques Atmosphériques: Management and Study of Atmospheric Spectroscopic Information (GEISA) spectroscopic database. Here, the 5AI scheme is applied to retrieve the column-averaged dry-air mole fraction of carbon dioxide (XCO2) from measurements performed by the Orbiting Carbon Observatory-2 (OCO-2) mission, and uses an empirically corrected absorption continuum in the O2 A-band. For airmasses below 3.0, XCO2 retrievals successfully capture the latitudinal variations of CO2, as well as its seasonal cycle and long-term increasing trend. Comparison with ground-based observations from the Total Carbon Column Observing Network (TCCON) yields a difference of 1.33 ± 1.29 ppm, which is similar to the standard deviation of the Atmospheric CO2 Observations from Space (ACOS) official products. We show that the systematic differences between 5AI and ACOS results can be fully removed by adding an average calculated – observed spectral residual correction to OCO-2 measurements, thus underlying the critical sensitivity of retrieval results to forward modelling. These comparisons show the reliability of 5AI as a Bayesian optimal estimation implementation that is easily adaptable to any instrument designed to retrieve column-averaged dry-air mole fractions of greenhouse gases.
- Published
- 2020
40. Synergetic use of IASI and TROPOMI space borne sensors for generating a tropospheric methane profile product
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Schneider, Matthias, primary, Ertl, Benjamin, additional, Diekmann, Christopher J., additional, Khosrawi, Farahnaz, additional, Röhling, Amelie N., additional, Hase, Frank, additional, Dubravica, Darko, additional, García, Omaira E., additional, Sepúlveda, Eliezer, additional, Borsdorff, Tobias, additional, Landgraf, Jochen, additional, Lorente, Alba, additional, Chen, Huilin, additional, Kivi, Rigel, additional, Laemmel, Thomas, additional, Ramonet, Michel, additional, Crevoisier, Cyril, additional, Pernin, Jérome, additional, Steinbacher, Martin, additional, Meinhardt, Frank, additional, Deutscher, Nicholas M., additional, Griffith, David W. T., additional, Velazco, Voltaire A., additional, and Pollard, David F., additional
- Published
- 2021
- Full Text
- View/download PDF
41. The Adaptable 4A Inversion (5AI): Description and first XCO2 retrievals from OCO-2 observations [Discussion paper]
- Author
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Dogniaux, Matthieu, Crevoisier, Cyril, Armante, Raymond, Capelle, Virginie, Delahaye, Thibault, Cassé, Vincent, Mazière, Martine de, Deutscher, Nicholas Michael, Feist, Dietrich G., García Rodríguez, Omaira Elena, Griffith, David W. T., Hase, Frank, Iraci, Laura, Kivi, Rigel, Morino, Isamu, Notholt, Justus, Pollard, David F., Roehl, Coleen M., Shiomi, Kei, Strong, Kimberly, Te, Yao, Velazco, Voltaire A., and Warneke, Thorsten
- Subjects
Greenhouse gases ,Carbon dioxide ,Climate change ,Remote sensing - Abstract
A better understanding of greenhouse gas surface sources and sinks is required in order to address the global challenge of climate change. Spaceborne remote estimations of greenhouse gas atmospheric concentrations can offer the global coverage that is necessary to improve the constraint on their fluxes, thus enabling a better monitoring of anthropogenic emissions. In this work, we introduce the Adaptable 4A Inversion (5AI) inverse scheme that aims to retrieve geophysical parameters from any remote sensing observation. The algorithm is based on Bayesian optimal estimation relying on the Operational version of the Automatized Atmospheric Absorption Atlas (4A/OP) radiative transfer forward model along with the Gestion et Étude des Informations Spectroscopiques Atmosphériques: Management and Study of Atmospheric Spectroscopic Information (GEISA) spectroscopic database. Here, the 5AI scheme is applied to retrieve the column-averaged dry-air mole fraction of carbon dioxide (XCO2) from measurements performed by the Orbiting Carbon Observatory-2 (OCO-2) mission, and uses an empirically corrected absorption continuum in the O2 A-band. For airmasses below 3.0, XCO2 retrievals successfully capture the latitudinal variations of CO2, as well as its seasonal cycle and long-term increasing trend. Comparison with ground-based observations from the Total Carbon Column Observing Network (TCCON) yields a difference of 1.33 ± 1.29 ppm, which is similar to the standard deviation of the Atmospheric CO2 Observations from Space (ACOS) official products. We show that the systematic differences between 5AI and ACOS results can be fully removed by adding an average calculated – observed spectral residual correction to OCO-2 measurements, thus underlying the critical sensitivity of retrieval results to forward modelling. These comparisons show the reliability of 5AI as a Bayesian optimal estimation implementation that is easily adaptable to any instrument designed to retrieve column-averaged dry-air mole fractions of greenhouse gases. This work has received funding from CNES and CNRS.
- Published
- 2020
42. Impact of atomic chlorine on the modelling of total methane and its 13C : 12C isotopic ratio at global scale
- Author
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Thanwerdas, Joël, Saunois, Marielle, Berchet, Antoine, Pison, Isabelle, Hauglustaine, Didier, Ramonet, Michel, Crevoisier, Cyril, Baier, Bianca, Sweeney, Colm, and Bousquet, Philippe
- Abstract
Methane (CH4) is the second strongest anthropogenic greenhouse gas after carbon dioxide (CO2) and is responsible for about 20 % of the warming induced by long-lived greenhouse gases since pre-industrial times. Oxidation by the hydroxyl radical (OH) is the dominant atmospheric sink for methane, contributing to approximately 90 % of the total methane loss. Chemical losses by reaction with atomic oxygen (O1D) and chlorine radicals (Cl) in the stratosphere are other sinks, contributing about 3 % to the total methane destruction. Moreover, the reaction with Cl is very fractionating, thus it has a much larger impact on δ13C-CH4 than the reaction with OH. In this paper, we assess the impact of atomic Cl on atmospheric methane mixing ratios, methane atmospheric loss and atmospheric δ13C-CH4. The offline version of the Global Circulation Model (GCM) LMDz, coupled to a chemistry module including the major methane chemical reactions, is run to simulate CH4 concentrations and δ13C-CH4 at the global scale. Atmospheric methane sink by Cl atoms in the stratosphere is found to be 7.32 ± 0.16 Tg/yr. Methane observations from vertical profiles obtained using AirCore samplers above 11 different locations across the globe and balloon measurements of δ13C-CH4 and methane are used to assess the impact of the Cl sink in the chemistry transport model. Above 10 km, the presence of Cl in the model is found to have only a small impact on the vertical profile of total methane but a major influence on δ13C-CH4 values, significantly improving the agreement between simulations and available observations. Stratospheric Cl is also found to have a substantial impact on surface δ13C-CH4 values, leading to a difference of +0.27 ‰ (less negative values) after a 19-year run. As a result, this study suggests that the Cl sink needs to be properly taken into account (magnitude and trends) in order to better understand trends in the atmospheric δ13C-CH4 signal when using atmospheric chemistry transport models for forward or inverse calculations.
- Published
- 2019
43. Benchmark Calculations of Radiative Forcing by Greenhouse Gases
- Author
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Pincus, Robert, primary, Buehler, Stefan A., additional, Brath, Manfred, additional, Crevoisier, Cyril, additional, Jamil, Omar, additional, Franklin Evans, K., additional, Manners, James, additional, Menzel, Raymond L., additional, Mlawer, Eli J., additional, Paynter, David, additional, Pernak, Rick L., additional, and Tellier, Yoann, additional
- Published
- 2020
- Full Text
- View/download PDF
44. The Adaptable 4A Inversion (5AI): Description and first XCO2 retrievals from OCO-2 observations
- Author
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Dogniaux, Matthieu, primary, Crevoisier, Cyril, additional, Armante, Raymond, additional, Capelle, Virginie, additional, Delahaye, Thibault, additional, Cassé, Vincent, additional, De Mazière, Martine, additional, Deutscher, Nicholas M., additional, Feist, Dietrich G., additional, Garcia, Omaira E., additional, Griffith, David W. T., additional, Hase, Frank, additional, Iraci, Laura T., additional, Kivi, Rigel, additional, Morino, Isamu, additional, Notholt, Justus, additional, Pollard, David F., additional, Roehl, Coleen M., additional, Shiomi, Kei, additional, Strong, Kimberly, additional, Té, Yao, additional, Velazco, Voltaire A., additional, and Warneke, Thorsten, additional
- Published
- 2020
- Full Text
- View/download PDF
45. The Global Methane Budget 2000–2017
- Author
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Saunois, Marielle, primary, Stavert, Ann R., additional, Poulter, Ben, additional, Bousquet, Philippe, additional, Canadell, Josep G., additional, Jackson, Robert B., additional, Raymond, Peter A., additional, Dlugokencky, Edward J., additional, Houweling, Sander, additional, Patra, Prabir K., additional, Ciais, Philippe, additional, Arora, Vivek K., additional, Bastviken, David, additional, Bergamaschi, Peter, additional, Blake, Donald R., additional, Brailsford, Gordon, additional, Bruhwiler, Lori, additional, Carlson, Kimberly M., additional, Carrol, Mark, additional, Castaldi, Simona, additional, Chandra, Naveen, additional, Crevoisier, Cyril, additional, Crill, Patrick M., additional, Covey, Kristofer, additional, Curry, Charles L., additional, Etiope, Giuseppe, additional, Frankenberg, Christian, additional, Gedney, Nicola, additional, Hegglin, Michaela I., additional, Höglund-Isaksson, Lena, additional, Hugelius, Gustaf, additional, Ishizawa, Misa, additional, Ito, Akihiko, additional, Janssens-Maenhout, Greet, additional, Jensen, Katherine M., additional, Joos, Fortunat, additional, Kleinen, Thomas, additional, Krummel, Paul B., additional, Langenfelds, Ray L., additional, Laruelle, Goulven G., additional, Liu, Licheng, additional, Machida, Toshinobu, additional, Maksyutov, Shamil, additional, McDonald, Kyle C., additional, McNorton, Joe, additional, Miller, Paul A., additional, Melton, Joe R., additional, Morino, Isamu, additional, Müller, Jurek, additional, Murguia-Flores, Fabiola, additional, Naik, Vaishali, additional, Niwa, Yosuke, additional, Noce, Sergio, additional, O'Doherty, Simon, additional, Parker, Robert J., additional, Peng, Changhui, additional, Peng, Shushi, additional, Peters, Glen P., additional, Prigent, Catherine, additional, Prinn, Ronald, additional, Ramonet, Michel, additional, Regnier, Pierre, additional, Riley, William J., additional, Rosentreter, Judith A., additional, Segers, Arjo, additional, Simpson, Isobel J., additional, Shi, Hao, additional, Smith, Steven J., additional, Steele, L. Paul, additional, Thornton, Brett F., additional, Tian, Hanqin, additional, Tohjima, Yasunori, additional, Tubiello, Francesco N., additional, Tsuruta, Aki, additional, Viovy, Nicolas, additional, Voulgarakis, Apostolos, additional, Weber, Thomas S., additional, van Weele, Michiel, additional, van der Werf, Guido R., additional, Weiss, Ray F., additional, Worthy, Doug, additional, Wunch, Debra, additional, Yin, Yi, additional, Yoshida, Yukio, additional, Zhang, Wenxin, additional, Zhang, Zhen, additional, Zhao, Yuanhong, additional, Zheng, Bo, additional, Zhu, Qing, additional, Zhu, Qiuan, additional, and Zhuang, Qianlai, additional
- Published
- 2020
- Full Text
- View/download PDF
46. Performance of upcoming CO2 monitoring satellites in the new high-resolution inverse model CTDAS-WRF
- Author
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Reum, Friedemann, primary, Florentie, Liesbeth, additional, Peters, Wouter, additional, Dogniaux, Matthieu, additional, Crevoisier, Cyril, additional, Sic, Bojan, additional, and Houweling, Sander, additional
- Published
- 2020
- Full Text
- View/download PDF
47. Supplementary material to "Impact of atomic chlorine on the modelling of total methane and its 13C : 12C isotopic ratio at global scale"
- Author
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Thanwerdas, Joël, primary, Saunois, Marielle, additional, Berchet, Antoine, additional, Pison, Isabelle, additional, Hauglustaine, Didier, additional, Ramonet, Michel, additional, Crevoisier, Cyril, additional, Baier, Bianca, additional, Sweeney, Colm, additional, and Bousquet, Philippe, additional
- Published
- 2019
- Full Text
- View/download PDF
48. Impact of atomic chlorine on the modelling of total methane and its 13C : 12C isotopic ratio at global scale
- Author
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Thanwerdas, Joël, primary, Saunois, Marielle, additional, Berchet, Antoine, additional, Pison, Isabelle, additional, Hauglustaine, Didier, additional, Ramonet, Michel, additional, Crevoisier, Cyril, additional, Baier, Bianca, additional, Sweeney, Colm, additional, and Bousquet, Philippe, additional
- Published
- 2019
- Full Text
- View/download PDF
49. Computation of longwave radiative flux and vertical heating rate with 4A-Flux v1.0 as integral part of the radiative transfer code 4A/OP v1.5.
- Author
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Tellier, Yoann, Crevoisier, Cyril, Armante, Raymond, Dufresne, Jean-Louis, and Meilhac, Nicolas
- Subjects
- *
HEAT flux , *RADIATIVE transfer , *INTEGRALS - Abstract
Based on advanced spectroscopic databases, line-by-line and layer-by-layer radiative transfer codes numerically solve the radiative transfer equation with a very high accuracy. Taking advantage of its pre-calculated optical depth look-up table, the fast and accurate radiative transfer model Automatized Atmospheric Absorption Atlas OPerational (4A/OP) calculates the transmission and radiance spectra for a user defined layered atmospheric model. Here we present a module, called 4A-Flux, developed and implemented into 4A/OP in order to include the calculation of the clear-sky longwave radiative flux profiles and heating rate profiles at a very high spectral resolution. Calculations are performed under the assumption of local thermodynamic equilibrium, plane-parallel atmosphere and specular reflection on the surface. The computation takes advantage of pre-tabulated exponential integral functions that are used instead of a classic angular quadrature. Furthermore, the sublayer variation of the Planck function is implemented to better represent the emission of layers with a high optical depth. Thanks to the implementation of 4A-Flux, 4A/OP model have participated in the Radiative Forcing Model Intercomparison Project (RFMIP-IRF) along with other state-of-the-art radiative transfer models. 4A/OP hemispheric flux profiles are compared to other models over the 1800 representative atmospheric situations of RFMIP, yielding an Outgoing Longwave Radiation (OLR) mean difference between 4A/OP and other models of -0.148 W .m-2 and a mean standard deviation of 0.218 W .m-2, showing a good agreement between 4A/OP and other models. 4A/OP is applied to the Thermodynamic Initial Guess Retrieval (TIGR) atmospheric database to analyze the response of the OLR and vertical heating rate to several perturbations of temperature or gas concentration. This work shows that 4A/OP with 4A-Flux module can successfully be used to simulate accurate flux and heating rate profiles and provide useful sensitivity studies including sensitivities to minor trace gases such as HFC134a, HCFC22 and CFC113. We also highlight the interest for the modeling community to extend intercomparison between models to comparisons between spectroscopic databases and modelling to improve the confidence in model simulations. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
50. The Space CARBon Observatory (SCARBO) concept: Assessment of XCO2 and XCH4 retrieval performance.
- Author
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Dogniaux, Matthieu, Crevoisier, Cyril, Gousset, Silvère, Le Coarer, Étienne, Ferrec, Yann, Croizé, Laurence, Lianghai Wu, Hasekamp, Otto, Sic, Bojan, and Brooker, Laure
- Subjects
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SPATIAL resolution , *OBSERVATORIES , *DEGREES of freedom , *MICROSPACECRAFT , *GREENHOUSE gases , *SPACE-based radar - Abstract
Several single-platform satellite missions have been designed during the past decades in order to retrieve the atmospheric concentrations of anthropogenic greenhouse gases (GHG), initiating worldwide efforts towards better monitoring of their sources and sinks. To set up a future operational system for anthropogenic GHG emission monitoring, both revisit frequency and spatial resolution need to be improved. The Space CARBon Observatory (SCARBO) project aims at significantly increasing the revisit frequency of spaceborne GHG measurements, while reaching state-of-the-art precision requirements, by implementing a concept of small satellite constellation. It would accommodate a miniaturized GHG sensor named NanoCarb coupled with an aerosol instrument, the multi-angle polarimeter SPEXone. More specifically, the NanoCarb sensor is a static Fabry-Perot imaging interferometer with a 2.3 x 2.3 km² spatial resolution and 200 km swath. It samples a truncated interferogram at optical path differences (OPDs) optimally sensitive to all the geophysical parameters necessary to retrieve column-averaged dry-air mole fractions of CO2 and CH4 (hereafter XCO2 and XCH4). In this work, we present the Level 2 performance assessment of the concept proposed in the SCARBO project. We perform inverse radiative transfer to retrieve XCO2 and XCH4 directly from synthetic NanoCarb truncated interferograms, and provide their systematic and random errors, column vertical sensitivities and degrees of freedom as a function of five scattering error-critical atmospheric and observational parameters. We show that NanoCarb XCO2 and XCH4 systematic retrieval errors can be greatly reduced with SPEXone posterior outputs used as improved prior aerosol constraints. For two thirds of the soundings, located at the centre of the 200 km NanoCarb swath, XCO2 and XCH4 random errors span 0.5 – 1 ppm and 4 – 6 ppb, respectively, compliant with their respective 1-ppm and 6-ppb precision objectives. Finally, these Level 2 performance results are parameterized as a function of the explored scattering error-critical atmospheric and observational parameters in order to time-efficiently compute extensive L2 error maps for future CO2 and CH4 flux estimation performance studies. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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