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228 results on '"Cammas, J.-P."'

3. Exploring fine-scale variability of stratospheric wind above the tropical la reunion island using rayleigh-mie doppler lidar

Author

Khaykin S. M., Hauchecorne A., Cammas J.-P., Marqestaut N., Mariscal J.-F., Posny F., Payen G., Porteneuve J., and Keckhut P.

Subjects
Physics, QC1-999
Abstract

A unique Rayleigh-Mie Doppler lidar capable of wind measurements in the 5-50 km altitude range is operated routinely at La Reunion island (21° S, 55° E) since 2015. We evaluate instrument’s capacities in capturing fine structures in stratospheric wind profiles and their temporal and spatial variability through comparison with collocated radiosoundings and ECMWF analysis. Perturbations in the wind velocity are used to retrieve gravity wave frequency spectrum.

Published
2018
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5. Ground-Based Rayleigh-Mie Doppler Lidar for Wind Measurements in the Middle Atmosphere

Author

Khaykin S. M., Hauchecorne A., Porteneuve J., Mariscal J.-F., D’Almeida E., Cammas J.-P., Payen G., Evan S., and Keckhut P.

Subjects
Physics, QC1-999
Abstract

A unique Rayleigh-Mie Doppler wind lidar, measuring Doppler shift between the emitted and backscattered light using directdetection technique is deployed at Observatory of Haute Provence Southern France) and at Reunion island (tropical Indian Ocean). The instrument was shown capable of wind measurements between 5 and 50 km with accuracy better than 1 m/s up to 30 km. The system consists of a monomode Nd:Yag laser operating at 532 nm, three telescopes and a double-edge Fabry-Perot interferometer. The laser light is sent alternatively in the vertical as well as zonal and meridional directions at 40° from the zenith using a rotating mirror. The two components of the horizontal wind are obtained from the measurement of the Doppler shift of the return signal spectrally filtered by the Fabry-Perot etalon. After demonstration of the method in 1989 the measurements were used for studying stratospheric dynamics as well as for constructing wind climatology up to 50 km altitude. A new system, featuring a more compact design was installed at Maïdo observatory at Reunion Island (21° S). The design of the instrument, results of observations and comparison against GPS radiosondes are presented. Application of Doppler lidar for validation of the future ADM-Aeolus satellite mission is discussed as well.

Published
2016
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7. Wave breaking and mixing at the subtropical tropopause

Author

Scott, R.K. and Cammas, J.-P.

Subjects
Atmospheric research -- Analysis, Rossby waves -- Research, Ocean -- Observations, Earth sciences, Science and technology
Abstract

This paper discusses Rossby wave breaking on the isentropic surfaces that intersect the subtropical tropopause, using winds and isentropic potential vorticity from high-resolution meteorological analysis. The focus is both on particular aspects of individual wave breaking events, as well as on more general aspects such as the spatial and temporal distribution of the mixing associated with these events. The direction and intensity of wave breaking is shown to exhibit the same dependence on stagnation points in the wind field as that seen in previous highly idealized numerical model studies. Wave breaking that results in stratospheric intrusions into the troposphere can be categorized as weak or strong, depending on the development of filaments or larger, coherent vortices or cutoff lows. The events presented show a deep vertical structure that approximately spans the region between the 330-K and 370-K isentropic surfaces, where the tropopause is steeply sloping through the subtropical jets. This is in contrast with tropospheric intrusions into the stratosphere, which appear to be less directly related to wave breaking than to the interaction of coherent structures in the tropospheric circulation. Transport estimates during weak wave breaking are shown to be very sensitive to the definition of the tropopause. Contour stretching is used as a measure of the mixing properties at the tropopause associated with the Rossby wave breaking and reveals longitudinal inhomogeneities that are consistent with the different structure of the subtropical jets over the Atlantic and Pacific Oceans. A strong seasonal cycle and interannual variability are also present, with generally stronger mixing in the summer and weaker mixing over the western Pacific during the warm phase of the El Nino--Southern Oscillation.

Published
2002

10. GT6 - Gaz traces réactifs

Author

SAUVAGE, S., Colomb, A., Gros, V., Salameh, T., Dusanter, Sébastien, Locoge, N., Gheusi, F., CAMMAS, J. P., DUFLOT, V., Borbon, A., Conil, S., Chelin, P., Pascal, N., XUEREF-REMI, I., Doussin, J., Michoud, V., Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Laboratoire d'aérologie (LA), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Groupe d'étude de l'atmosphère météorologique (CNRM-GAME), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), Institut National de la Santé et de la Recherche Médicale EMI 0011, Faculty of Medicine, Paris XII University, Creteil 94010, France, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Paris (UP)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Biochimie et Physiologie Moléculaire des Plantes (BPMP), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[INFO]Computer Science [cs], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

11. GT6 - Gaz réactifs bilan et actions en cours

Author

SAUVAGE, S., Colomb, A., Gros, V., Gheusi, F., CAMMAS, J. P., Duflot, Valentin, Borbon, A., Conil, S., Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Chimie Atmosphérique Expérimentale (CAE), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Laboratoire d'aérologie (LA), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Atmosphère et des Cyclones (LACy), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[INFO]Computer Science [cs], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

13. The first regular measurements of ozone, carbon monoxide and water vapour in the Pacific UTLS by IAGOS

Author

Clark, H., Sauvage, B., Thouret, V., Nédélec, P., Blot, R., Wang, K.-Y., Smit, H., Petzold, A., Athier, G., Boulanger, D., Cousin, J.-M., Beswick, K., Gallagher, M., Baumgardner, D., Kaiser, J., Flaud, J.-M., Wahner, A., Volz-Thomas, A., and Cammas, J.-P.

Abstract

We present the features seen in the first 2 months (July and August 2012) of data collected over the Pacific by IAGOS (In-service Aircraft for a Global Observing System)-equipped aircraft. IAGOS is the continuation and development of the well-known MOZAIC (Measurement of Ozone and Water Vapour on Airbus in-service Aircraft) project where scientific instruments were carried on commercially operated A340 aircraft to make measurements of chemical species in the atmosphere. Here, we show data from an aircraft operated by China Airlines on routes from Taipei to Vancouver, which provided the first trans-Pacific measurements by an IAGOS-equipped aircraft. We describe the chemical composition of the extratropical upper troposphere/lower stratosphere (Ex-UTLS) across the Pacific basin in the Northern Hemisphere. The observed concentrations of ozone span a range from 18 to 500 ppbv indicating sources in the marine boundary layer and lowermost stratosphere, respectively. Concentrations of carbon monoxide (CO) greater than 400 ppbv are observed in the Ex-UTLS suggesting that plumes of pollution have been exported from the continent. These low concentrations of ozone and high concentrations of CO were rarely recorded in 8 yr of MOZAIC observations over the Atlantic.

Published
2015

18. Changes in ozone over Europe: Analysis of ozone measurements from sondes, regular aircraft (MOZAIC) and alpine surface sites

Author

Logan J. A., Staehelin J., Megretskaia I. A., Cammas J. P., Thouret V., Claude H., De Backer H., Steinbacher M., Scheel H. E., Stuebi R., Froehlich M., Derwent R., Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), Harvard University [Cambridge], Institute for Atmospheric and Climate Science [Zürich] (IAC), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Ozone et Précurseurs (O3P ), Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées, Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Institut Royal Météorologique de Belgique [Bruxelles] (IRM), Laboratory of Air Pollution and Environmental Technology, Swiss Federal Laboratories for Materials Science and Technology [Thun] (EMPA), Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Air Pollution Control and Climate Change Mitigation, Environment Agency Austria, Rdscientific [Newbury], Harvard University, Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Laboratory for Air Pollution/Environmental Technology, Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] (EMPA), and Umweltbundesamt GmbH = Environment Agency Austria

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; We use ozone observations from sondes, regular aircraft, and alpine surface sites in a self-consistent analysis to determine robust changes in the time evolution of ozone over Europe. The data are most coherent since 1998, with similar interannual variability and trends. Ozone has decreased slowly since 1998, with an annual mean trend of −0.15 ppb yr−1 at ∼3 km and the largest decrease in summer. There are some substantial differences between the sondes and other data, particularly in the early 1990s. The alpine and aircraft data show that ozone increased from late 1994 until 1998, but the sonde data do not. Time series of differences in ozone between pairs of locations reveal inconsistencies in various data sets. Differences as small as few ppb for 2-3 years lead to different trends for 1995-2008, when all data sets overlap. Sonde data from Hohenpeissenberg and in situ data from nearby Zugspitze show ozone increased by ∼1 ppb yr−1 during 1978-1989. We construct a mean alpine time series using data for Jungfraujoch, Zugspitze, and Sonnblick. Using Zugspitze data for 1978-1989, and the mean time series since 1990, we find that the ozone increased by 6.5-10 ppb in 1978-1989 and 2.5-4.5 ppb in the 1990s and decreased by 4 ppb in the 2000s in summer with no significant changes in other seasons. It is hard to reconcile all these changes with trends in emissions of ozone precursors, and in ozone in the lowermost stratosphere. We recommend data sets that are suitable for evaluation of model hindcasts.

Published
2012
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19. Current status of the ability of the GEMS/MACC models to reproduce the tropospheric CO vertical distribution as measured by MOZAIC

Author

Elguindi, N., Ordonez, C., Turquety, S., Cammas, J.-P., Schultz, M., Thouret, V., Flemming, J., Stein, O., Huijnen, V., Moinat, P., Inness, A., Peuch, V.-H., and Stohl, A.

Subjects
ddc:910
Abstract

Vertical profiles of CO taken from the MOZAIC aircraft database are used to present (1) a global analysis of CO seasonal averages and interannual variability for the years 2002–2007 and (2) a global validation of CO estimates produced by the MACC models for 2004, including an assessment of their ability to transport pollutants originating from the Alaskan/Canadian wildfires. Seasonal averages and interannual variability from several MOZAIC sites representing different regions of the world show that CO concentrations are highest and most variable during the winter season. The inter-regional variability is significant with concentrations increasing eastward from Europe to Japan. The impact of the intense boreal fires, particularly in Russia, during the fall of 2002 on the Northern Hemisphere CO concentrations throughout the troposphere is well represented by the MOZAIC data. A global validation of the GEMS/MACC GRG models which include three stand-alone CTMs (MOZART, MOCAGE and TM5) and the coupled ECMWF Integrated Forecasting System (IFS)/MOZART model with and without MOPITT CO data assimilation show that the models have a tendency to underestimate CO. The models perform best in Europe and the US where biases range from 0 to –25% in the free troposphere and from 0 to –50% in the surface and boundary layers (BL). The biases are largest in the winter and during the daytime when emissions are highest, indicating that current inventories are too low. Data assimilation is shown to reduce biases by up to 25% in some regions. The models are not able to reproduce well the CO plumes originating from the Alaskan/Canadian wildfires at downwind locations in the eastern US and Europe, not even with assimilation. Sensitivity tests reveal that this is mainly due to deficiencies in the fire emissions inventory and injection height.

Published
2010
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20. Water vapor observations up to the lower stratosphere through the Raman lidar during the Maïdo Lidar Calibration Campaign

Author

Dionisi, D., primary, Keckhut, P., additional, Courcoux, Y., additional, Hauchecorne, A., additional, Porteneuve, J., additional, Baray, J. L., additional, Leclair de Bellevue, J., additional, Vérèmes, H., additional, Gabarrot, F., additional, Payen, G., additional, Decoupes, R., additional, and Cammas, J. P., additional

Published
2015
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21. Global model simulations of air pollution during the 2003 European heat wave

Author

Ordóñez, C. Elguindi, N. Stein, O. Huijnen, V. Flemming, J. Inness, A. Flentje, H. Katragkou, E. Moinat, P. Peuch, V.-H. Segers, A. Thouret, V. Athier, G. Van Weele, M. Zerefos, C.S. Cammas, J.-P. Schultz, M.G.

Abstract

Three global Chemistry Transport Models ĝ€" MOZART, MOCAGE, and TM5 ĝ€" as well as MOZART coupled to the IFS meteorological model including assimilation of ozone (O3) and carbon monoxide (CO) satellite column retrievals, have been compared to surface measurements and MOZAIC vertical profiles in the troposphere over Western/Central Europe for summer 2003. The models reproduce the meteorological features and enhancement of pollution during the period 2ĝ€"14 August, but not fully the ozone and CO mixing ratios measured during that episode. Modified normalised mean biases are around −25% (except ∼5% for MOCAGE) in the case of ozone and from −80% to −30% for CO in the boundary layer above Frankfurt. The coupling and assimilation of CO columns from MOPITT overcomes some of the deficiencies in the treatment of transport, chemistry and emissions in MOZART, reducing the negative biases to around 20%. The high reactivity and small dry deposition velocities in MOCAGE seem to be responsible for the overestimation of O3 in this model. Results from sensitivity simulations indicate that an increase of the horizontal resolution to around 1°×1° and potential uncertainties in European anthropogenic emissions or in long-range transport of pollution cannot completely account for the underestimation of CO and O3 found for most models. A process-oriented TM5 sensitivity simulation where soil wetness was reduced results in a decrease in dry deposition fluxes and a subsequent ozone increase larger than the ozone changes due to the previous sensitivity runs. However this latest simulation still underestimates ozone during the heat wave and overestimates it outside that period. Most probably, a combination of the mentioned factors together with underrepresented biogenic emissions in the models, uncertainties in the modelling of vertical/horizontal transport processes in the proximity of the boundary layer as well as limitations of the chemistry schemes are responsible for the underestimation of ozone (overestimation in the case of MOCAGE) and CO found in the models during this extreme pollution event.

Published
2010

22. Midlatitude stratosphere - troposphere exchange as diagnosed by MLS O3 and MOPITT CO assimilated fields

Author

El Amraoui, L., Attié, J.-L., Semane, N., Claeyman, M., Peuch, V.-H., Warner, J., Ricaud, P., Cammas, J.-P., Piacentini, A., Josse, B., Cariolle, D., Massart, S., Bencherif, H., Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire d'aérologie (LAERO), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Direction de la Météorologie Nationale, Direction de la Météorologie Nationale du Maroc, University of Maryland [College Park], University of Maryland System, Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Groupe d'étude de l'atmosphère météorologique (CNRM-GAME), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, CERFACS, and Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
modèle global, mesures, méthode variationnelle, analyse, transport chimique, O3, [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology, assimilation des données, variational method, carbon monoxide, lcsh:Chemistry, radioprobe, coefficient de correlation, chemical transport, data assimilation, validation, monoxyde de carbone, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], RMS, lcsh:QC1-999, CO, atmosphère, ozone, lcsh:QD1-999, troposphere, Iles britanniques, radiosonde, stratosphère, lcsh:Physics, biais
Abstract

International audience; This paper presents a comprehensive characterization of a very deep stratospheric intrusion which occurred over the British Isles on 15 August 2007. The signature of this event is diagnosed using ozonesonde measurements over Lerwick, UK (60.14 N, 1.19 W) and is also well characterized using meteorological analyses from the global operational weather prediction model of Météo-France, ARPEGE. Modelled as well as assimilated fields of both ozone (O3) and carbon monoxide (CO) have been used in order to better document this event. O3 and CO from Aura/MLS and Terra/MOPITT instruments, respectively, are assimilated into the three-dimensional chemical transport model MOCAGE of Météo-France using a variational 3-DFGAT (First Guess at Appropriate Time) method. The validation of O3 and CO assimilated fields is done using selfconsistency diagnostics and by comparison with independent observations such as MOZAIC (O3 and CO), AIRS (CO) and OMI (O3). It particularly shows in the upper troposphere and lower stratosphere region that the assimilated fields are closer to MOZAIC than the free model run. The O3 bias between MOZAIC and the analyses is −11.5 ppbv with a RMS of 22.4 ppbv and a correlation coefficient of 0.93, whereas between MOZAIC and the free model run, the corresponding values are 33 ppbv, 38.5 ppbv and 0.83, respectively. In the same way, for CO, the bias, RMS and correlation coefficient between MOZAIC and the analyses are −3.16 ppbv, 13 ppbv and 0.79, respectively, whereas between MOZAIC and the free model run, the corresponding values are 33 ppbv, 38.5 ppbv and 0.83, respectively. In the same way, for CO, the bias, RMS and correlation coefficient between MOZAIC and the analyses are −3.16 ppbv, 13 ppbv and 0.79, respectively, whereas between MOZAIC and the free model they are 6.3 ppbv, 16.6 ppbv and 0.71, respectively. The paper also presents a demonstration of the capability of O3 and CO assimilated fields to better describe a stratosphere-troposphere exchange (STE) event in comparison with the free run modelled O3 and CO fields. Although the assimilation of MLS data improves the distribution of O3 above the tropopause compared to the free model run, it is not sufficient to reproduce the STE event well. Assimilated MOPITT CO allows a better qualitative description of the stratospheric intrusion event. The MOPITT CO analyses appear more promising than the MLS O3 analyses in terms of their ability to capture a deep STE event. Therefore, the results of this study open the perspectives for using MOPITT CO in the STE studies.

Published
2010
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23. Observational characteristics of the tropopause inversion layer derived from CHMAP/GRACE radio occultations and MOZAIC aircraft data

Author

Schmidt, T., Cammas, J.-P., Smit, H.G.J., Heise, S., Wickert, J., and Haser, A.

Subjects
ddc:550
Abstract

In this study we discuss characteristics of the Northern Hemisphere (NH) midlatitude (40 degrees N-60 degrees N) tropopause inversion layer (TIL) based on two data sets. First, temperature measurements from GPS radio occultation data (CHAMP and GRACE) for the time interval 2001-2009 are used to exhibit seasonal properties of the TIL bottom height defined here as the height of the squared buoyancy frequency minimum N-2 below the thermal tropopause, the TIL maximum height as the height of the N-2 maximum above the tropopause, and the TIL top height as the height of the temperature maximum above the tropopause. Mean values of the TIL bottom, TIL maximum, and TIL top heights relative to the thermal tropopause for the NH midlatitudes are (-2.08 +/- 0.35) km, (0.52 +/- 0.10) km and (2.10 +/- 0.23) km, respectively. A seasonal cycle of the TIL bottom and TIL top height is observed with values closer to the thermal tropopause during summer. Secondly, high-resolution temperature and trace gas profile measurements on board commercial aircrafts (Measurement of Ozone and Water Vapor by Airbus In-Service Aircraft (MOZAIC) program) from 2001-2008 for the NH midlatitude (40 degrees N-60 degrees N) region are used to characterize the TIL as a mixing layer around the tropopause. Mean TIL bottom, TIL maximum, and TIL top heights based on the MOZAIC temperature (N-2) measurements confirm the results from the GPS data, even though most of the MOZAIC profiles used here are available under cyclonic situations. Further, we demonstrate that the mixing ratio gradients of ozone (O-3) and carbon monoxide (CO) are suitable parameters for characterizing the TIL structure.

Published
2010
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24. The influence of biogenic emissions from Africa on tropical tropospheric ozone during 2006: a global modeling study

Author

Williams, J. E., Scheele, M. P., Velthoven, P. F. J., Cammas, J. -P, Thouret, V., Galy-Lacaux, C., and Andreas Volz-Thomas

Subjects
lcsh:Chemistry, lcsh:QD1-999, ddc:550, lcsh:Physics, lcsh:QC1-999
Abstract

We have performed simulations using a 3-D global chemistry-transport model to investigate the influence that biogenic emissions from the African continent exert on the composition of the troposphere in the tropical region. For this purpose we have applied two recently developed biogenic emission inventories provided for use in large-scale global models (Granier et al., 2005; LathiSre et al., 2006) whose seasonality and temporal distribution for biogenic emissions of isoprene, other volatile organic compounds and NO is markedly different. The use of the 12 year average values for biogenic emissions provided by LathiSre et al. (2006) results in an increase in the amount of nitrogen sequestrated into longer lived reservoir compounds which contributes to the reduction in the tropospheric ozone burden in the tropics. The associated re-partitioning of nitrogen between PAN, HNO3 and organic nitrates also results in a similar to 5% increase in the loss of nitrogen by wet deposition. At a global scale there is a reduction in the oxidizing capacity of the model atmosphere which increases the atmospheric lifetimes of CH4 and CO by similar to 1.5% and similar to 4%, respectively. Comparisons against a range of different measurements indicate that applying the 12 year average of LathiSre et al. (2006) improves the performance of TM4_AMMA for 2006 in the tropics. By the use of sensitivity studies we show that the release of NO from soils in Africa accounts for between similar to 2-45% of tropospheric ozone in the African troposphere, similar to 10% in the upper troposphere and between similar to 5-20% of the tropical tropospheric ozone column over the tropical Atlantic Ocean. The subsequent reduction in OH over the source regions allows enhanced transport of CO out of the region. For biogenic volatile organic C1 to C3 species released from Africa, the effects on tropical tropospheric ozone are rather limited, although this source contributes to the global burden of VOC by between similar to 2-4% and has a large influence on the organic composition of the troposphere over the tropical Atlantic Ocean.

Published
2009

25. Severe ozone air pollution in the Persian Gulf region

Author

Johannes (Jos) Lelieveld, Hoor, P., Joeckel, P., Pozzer, A., Hadjinicolaou, P., Cammas, J. -P, and Beirle, S.

Subjects
lcsh:Chemistry, lcsh:QD1-999, lcsh:Physics, lcsh:QC1-999
Abstract

Recently it was discovered that over the Middle East during summer ozone mixing ratios can reach a pronounced maximum in the middle troposphere. Here we extend the analysis to the surface and show that especially in the Persian Gulf region conditions are highly favorable for ozone air pollution. We apply the EMAC atmospheric chemistry-climate model to investigate long-distance transport and the regional formation of ozone. Further, we make use of available in situ and satellite measurements and compare these with model output. The results indicate that the region is a hot spot of photochemical smog where European Union air quality standards are violated throughout the year. Long-distance transports of air pollution from Europe and the Middle East, natural emissions and stratospheric ozone conspire to bring about relatively high background ozone mixing ratios. This provides a hotbed to strong and growing indigenous air pollution in the dry local climate, and these conditions are likely to get worse in the future.

Published
2009
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27. Ozone profiles obtained by DIAL technique at Maïdo Observatory in La Reunion Island: comparisons with ECC ozone-sondes, ground-based FTIR spectrometer and microwave radiometer measurements.

Author

Portafaix, T., Godin-Beekmann, S., Payen, G., de Mazière, M., Langerock, B., Fernandez, S., Posny, F., Cammas, J. P., Metzger, J. M., Bencherif, H., Vigouroux, C., and Marquestaut, N.

Subjects
OZONESONDES, FOURIER transform infrared spectrophotometers, MICROWAVE radiometers, LIDAR
Abstract

A DIAL lidar system performing stratospheric ozone profile measurements from 15 to 45 km is installed at Reunion Island (southwest of Indian Ocean). The purpose of this communication is to present this DIAL system mounted now at the new Maïdo Observatory since February 2013, and the ozone profile retrieval. The first stratospheric ozone profiles obtained during 2013 and 2014 will be presented and discussed. Inter-comparison and differences observed with other high vertical resolution ozone profiles performed by ECC ozonesonde will be shown. Finally, comparisons with low vertical resolution ozone profiles retrieved from microwave and FTIR remote sensing measurements performed at Maïdo will be carried out, making appropriate use of the associated averaging kernels. [ABSTRACT FROM AUTHOR]

Published
2016
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28. Cross-tropopause fluxes of ozone using assimilation of MOZAIC observations in a global CTM

Author

Clark, H. L., Cathala, M.-L., Teyssèdre, H., Cammas, J.-P., Peuch, V.-H., Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Atmospheric Science, 010504 meteorology & atmospheric sciences, 13. Climate action, 7. Clean energy, 01 natural sciences, 0105 earth and related environmental sciences
Abstract

Ozone measurements from Measurements of OZone and wAter vapour by aIrbus in-service airCraft (MOZAIC) have been assimilated into the global chemical transport model of Météo France known as Modèle de Chimie Atmosphérique à Grande Echelle (MOCAGE). The assimilation makes improvements to the free model simulations of ozone in the upper troposphere and lower stratosphere, which are generally overestimated in the tropical region and underestimated in mid-latitudes. The tropical–subtropical gradient of ozone is also improved following assimilation and comparison with vertical profiles from ozonesondes suggests that the assimilation leads to a better representation of the vertical gradient around the tropopause. We use the assimilated fields to calculate a value for the flux of ozone across the tropopause. The net flux of ozone from stratosphere to troposphere is found to be 451 Tg yr-1 before assimilation and 383 Tg yr-1 after assimilation. The downward flux of ozone in the mid-latitudes exhibits an annual cycle with maximum flux occurring in early spring and minimum flux in autumn.DOI: 10.1111/j.1600-0889.2006.00243.x

Published
2007
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32. Water vapor observations up to the lower stratosphere through the Raman lidar during the MAïdo LIdar Calibration Campaign

Author

Dionisi, D., primary, Keckhut, P., additional, Courcoux, Y., additional, Hauchecorne, A., additional, Porteneuve, J., additional, Baray, J. L., additional, Leclair de Bellevue, J., additional, Vérèmes, H., additional, Gabarrot, F., additional, Payen, G., additional, Decoupes, R., additional, and Cammas, J. P., additional

Published
2014
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33. Stretching rates and equivalent length near the tropopause

Author

Scott, R. K., Emily Shuckburgh, Cammas, J. -P, Legras, B., British Antarctic Survey (BAS), Natural Environment Research Council (NERC), Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), 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), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Columbia University [New York], 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, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Abstract

Diagnostics of mixing in the upper troposphere/lower stratosphere region reveal interesting seasonal and interannual variability and illustrate how the subtropical tropopause can be identified with a region of minimum mixing, a partial barrier to the transport of air between the troposphere and stratosphere. Both the strength and the location of this barrier show substantial seasonal variability, with a stronger barrier and weaker mixing observed during winter. The interannual variability of the mixing intensity near the tropopause on the 350 K isentropic surface suggests a correlation with the phase of the El Niño-Southern Oscillation, with weaker mixing occurring during strong El Niño years. The diagnostics are based on the analyses and reanalyses from the European Centre for Medium-Range Weather Forecasts over the 21 year period 1979–2000 and include the exponential stretching rates of material contours and Nakamura's [1996] modified Lagrangian mean effective diffusivity/equivalent length. As well as providing information about the spatial and temporal distribution of mixing intensity, the diagnostics also indicate sensitivity to changes in the analyses/reanalyses data sets. In particular, a stronger seasonal cycle and greater interannual variability is found in the more recent (1994–2000) analyses than in the earlier (1979-1993) reanalyses.

Published
2003
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35. Maïdo observatory: a new high-altitude station facility at Reunion Island (21° S, 55° E) for long-term atmospheric remote sensing and in situ measurements

Author

Baray, J.-L., primary, Courcoux, Y., additional, Keckhut, P., additional, Portafaix, T., additional, Tulet, P., additional, Cammas, J.-P., additional, Hauchecorne, A., additional, Godin Beekmann, S., additional, De Mazière, M., additional, Hermans, C., additional, Desmet, F., additional, Sellegri, K., additional, Colomb, A., additional, Ramonet, M., additional, Sciare, J., additional, Vuillemin, C., additional, Hoareau, C., additional, Dionisi, D., additional, Duflot, V., additional, Vérèmes, H., additional, Porteneuve, J., additional, Gabarrot, F., additional, Gaudo, T., additional, Metzger, J.-M., additional, Payen, G., additional, Leclair de Bellevue, J., additional, Barthe, C., additional, Posny, F., additional, Ricaud, P., additional, Abchiche, A., additional, and Delmas, R., additional

Published
2013
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37. Maïdo observatory: a new altitude station facility at Reunion Island (21° S, 55° E) for long-term atmospheric remote sensing and in-situ measurements

Author

Baray, J.-L., primary, Courcoux, Y., additional, Keckhut, P., additional, Portafaix, T., additional, Tulet, P., additional, Cammas, J.-P., additional, Hauchecorne, A., additional, Godin-Beekmann, S., additional, De Mazière, M., additional, Hermans, C., additional, Desmet, F., additional, Sellegri, K., additional, Colomb, A., additional, Ramonet, M., additional, Sciare, J., additional, Vuillemin, C., additional, Hoareau, C., additional, Dionisi, D., additional, Duflot, V., additional, Vérèmes, H., additional, Porteneuve, J., additional, Gabarrot, F., additional, Gaudo, T., additional, Metzger, J.-M., additional, Payen, G., additional, Leclair de Bellevue, J., additional, Barthe, C., additional, Posny, F., additional, Ricaud, P., additional, Abchiche, A., additional, and Delmas, R., additional

Published
2013
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38. Airborne observations of the impact of a convective system on the planetary boundary layer thermodynamics and aerosol distribution in the inter-tropical discontinuity region of the West African Monsoon

Author

Flamant, C., Chaboureau, J-P., Parker, D. J., Taylor, C. M., Cammas, J-P., Bock, O., Timouk, F., Pelon, J., Flamant, C., Chaboureau, J-P., Parker, D. J., Taylor, C. M., Cammas, J-P., Bock, O., Timouk, F., and Pelon, J.

Abstract

The impact of a convective system downdraught and associated gravity current on the monsoon and harmattan flow structure as well as on aerosol vertical distribution over the Sahel and the Sahara is investigated using dropsondes and an airborne lidar. Complementary ground-based and satellite observations, as well as European Centre for Medium-range Weather Forecasts analyses are also used. The mission was conducted on 5 June 2006, in the framework of the African Monsoon Multidisciplinary Analysis Special Observing Period. The targeted area was the Saharan heat low region, and Mali in particular, over which the inter-tropical discontinuity was strongly perturbed by the convective system. To the north, away from the influence of the gravity current, the atmosphere exhibited a two-layer structure, with a well mixed 3 km deep internal boundary layer capped by a stable layer 2-2.5 km deep layer referred to as the Saharan aerosol layer (SAL). The aerosol loading in the internal boundary layer (as determined by lidar) was observed to be much less than in the SAL above. Plumes of dust generated by strong low-level winds west of the Hoggar as observed in Spinning Enhanced Visible and Infra-Red Imager (SEVIRI) images, and possibly injected in the upper SAL through orographic lifting, contributed to the dust loading of the elevated SAL over much of the domain observed by the lidar. In the northernmost part of the domain investigated, the depth of the SAL top was decreased as the result of subsidence enhanced by the presence of an elevated jet associated with the monsoon trough and/or related to the return circulation of plain-mountain wind system involving the Atlas range. Associated with the gravity current passing over dust sources, a large aerosol plume was observed by means of lidar measurements and SEVIRI imagery. The plume was seen to reach heights of approximately 3 km above ground level a few tens of kilometres behind the leading edge. Lidar measurements suggest that a

Published
2007

39. CO measurements from the ACE-FTS satellite instrument: data analysis and validation using ground-based, airborne and spaceborne observations

Author

Clerbaux, C, George, M, Turquety, S, Walker, K A, Jones, Nicholas B, Griffith, David W, Rinsland, C P, Mahieu, E, De Maziere, M, Kagawa, A., Hannigan, J, Coffey, M, Hase, F, Hopfner, M, Duchatelet, P, Kramer, I, Strandberg, A, Strong, K, Kasai, Y, Barret, B, Ricaud, p, Murtagh, D, Dupuy, E, Catoire, V, Robert, C, Senten, C, Livesey, N J, Luo, M, Lopez-Puertas, M, Medelec, Ph, Pazmino, A, Pumphrey, H, Borsdorff, T, Coheur, P F, Cammas, J P, Drummond, James, de Zafra, R, Deeter, M, Emmons, L, Eddounia, F, Gille, J C, le Flochmoen, E, Boone, C, Funke, B, Schneider, M, Stiller, G P, Bernath, P, Edwards, D P, Clerbaux, C, George, M, Turquety, S, Walker, K A, Jones, Nicholas B, Griffith, David W, Rinsland, C P, Mahieu, E, De Maziere, M, Kagawa, A., Hannigan, J, Coffey, M, Hase, F, Hopfner, M, Duchatelet, P, Kramer, I, Strandberg, A, Strong, K, Kasai, Y, Barret, B, Ricaud, p, Murtagh, D, Dupuy, E, Catoire, V, Robert, C, Senten, C, Livesey, N J, Luo, M, Lopez-Puertas, M, Medelec, Ph, Pazmino, A, Pumphrey, H, Borsdorff, T, Coheur, P F, Cammas, J P, Drummond, James, de Zafra, R, Deeter, M, Emmons, L, Eddounia, F, Gille, J C, le Flochmoen, E, Boone, C, Funke, B, Schneider, M, Stiller, G P, Bernath, P, and Edwards, D P

Abstract

The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Carbon monoxide (CO), a good tracer of pollution plumes and atmospheric dynamics, is one of the key species provided by the primary instrument, the ACE-Fourier Transform Spectrometer (ACE-FTS). This instrument performs measurements in both the CO 1-0 and 2-0 ro-vibrational bands, from which vertically resolved CO concentration profiles are retrieved, from the mid-troposphere to the thermosphere. This paper presents an updated description of the ACE-FTS version 2.2 CO data product, along with a comprehensive validation of these profiles using available observations (February 2004 to December 2006). We have compared the CO partial columns with ground-based measurements using Fourier transform infrared spectroscopy and millimeter wave radiometry, and the volume mixing ratio profiles with airborne (both high-altitude balloon flight and airplane) observations. CO satellite observations provided by nadir-looking instruments (MOPITT and TES) as well as limb-viewing remote sensors (MIPAS, SMR and MLS) were also compared with the ACE-FTS CO products. We show that the ACE-FTS measurements provide CO profiles with small retrieval errors (better than 5% from the upper troposphere to 40 km, and better than 10% above). These observations agree well with the correlative measurements, considering the rather loose coincidence criteria in some cases. Based on the validation exercise we assess the following uncertainties to the ACE-FTS measurement data: better than 15% in the upper troposphere (812 km), than 30% in the lower stratosphere (1230 km), and than 25% from 30 to 100 km.

Published
2007

40. Retrieval of MetOp-A/IASI CO profiles and validation with MOZAIC data

Author

De Wachter, E., primary, Barret, B., additional, Le Flochmoën, E., additional, Pavelin, E., additional, Matricardi, M., additional, Clerbaux, C., additional, Hadji-Lazaro, J., additional, George, M., additional, Hurtmans, D., additional, Coheur, P.-F., additional, Nedelec, P., additional, and Cammas, J. P., additional

Published
2012
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41. Assimilation of IASI satellite CO fields into a global chemistry transport model for validation against aircraft measurements

Author

Klonecki, A., primary, Pommier, M., additional, Clerbaux, C., additional, Ancellet, G., additional, Cammas, J.-P., additional, Coheur, P.-F., additional, Cozic, A., additional, Diskin, G. S., additional, Hadji-Lazaro, J., additional, Hauglustaine, D. A., additional, Hurtmans, D., additional, Khattatov, B., additional, Lamarque, J.-F., additional, Law, K. S., additional, Nedelec, P., additional, Paris, J.-D., additional, Podolske, J. R., additional, Prunet, P., additional, Schlager, H., additional, Szopa, S., additional, and Turquety, S., additional

Published
2012
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43. 3-D evaluation of tropospheric ozone simulations by an ensemble of regional Chemistry Transport Model

Author

Zyryanov, D., primary, Foret, G., additional, Eremenko, M., additional, Beekmann, M., additional, Cammas, J.-P., additional, D'Isidoro, M., additional, Elbern, H., additional, Flemming, J., additional, Friese, E., additional, Kioutsioutkis, I., additional, Maurizi, A., additional, Melas, D., additional, Meleux, F., additional, Menut, L., additional, Moinat, P., additional, Peuch, V.-H., additional, Poupkou, A., additional, Razinger, M., additional, Schultz, M., additional, Stein, O., additional, Suttie, A. M., additional, Valdebenito, A., additional, Zerefos, C., additional, Dufour, G., additional, Bergametti, G., additional, and Flaud, J.-M., additional

Published
2012
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44. Emission sources contributing to tropospheric ozone over Equatorial Africa during the summer monsoon

Author

Bouarar, I., primary, Law, K. S., additional, Pham, M., additional, Liousse, C., additional, Schlager, H., additional, Hamburger, T., additional, Reeves, C. E., additional, Cammas, J.-P., additional, Nédéléc, P., additional, Szopa, S., additional, Ravegnani, F., additional, Viciani, S., additional, D'Amato, F., additional, Ulanovsky, A., additional, and Richter, A., additional

Published
2011
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45. Assimilation of IASI satellite CO fields into a global chemistry transport model for validation against aircraft measurements

Author

Klonecki, A., primary, Pommier, M., additional, Clerbaux, C., additional, Ancellet, G., additional, Cammas, J.-P., additional, Coheur, P.-F., additional, Cozic, A., additional, Diskin, G. S., additional, Hadji-Lazaro, J., additional, Hauglustaine, D. A., additional, Hurtmans, D., additional, Khattatov, B., additional, Lamarque, J.-F., additional, Law, K. S., additional, Nedelec, P., additional, Paris, J.-D., additional, Podolske, J. R., additional, Prunet, P., additional, Schlager, H., additional, Szopa, S., additional, and Turquety, S., additional

Published
2011
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46. Supplementary material to "3-D evaluation of tropospheric ozone simulations by an ensemble of regional Chemistry Transport Model"

Author

Zyryanov, D., primary, Foret, G., additional, Eremenko, M., additional, Beekmann, M., additional, Cammas, J.-P., additional, D'Isidoro, M., additional, Elbern, H., additional, Flemming, J., additional, Friese, E., additional, Kioutsioutkis, I., additional, Maurizi, A., additional, Melas, D., additional, Meleux, F., additional, Menut, L., additional, Moinat, P., additional, Peuch, V.-H., additional, Poupkou, A., additional, Razinger, M., additional, Schultz, M., additional, Stein, O., additional, Suttie, A. M., additional, Valdebenito, A., additional, Zerefos, C., additional, Dufour, G., additional, Bergametti, G., additional, and Flaud, J.-M., additional

Published
2011
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47. 3-D evaluation of tropospheric ozone simulations by an ensemble of regional Chemistry Transport Model

Author

Zyryanov, D., primary, Foret, G., additional, Eremenko, M., additional, Beekmann, M., additional, Cammas, J.-P., additional, D'Isidoro, M., additional, Elbern, H., additional, Flemming, J., additional, Friese, E., additional, Kioutsioutkis, I., additional, Maurizi, A., additional, Melas, D., additional, Meleux, F., additional, Menut, L., additional, Moinat, P., additional, Peuch, V.-H., additional, Poupkou, A., additional, Razinger, M., additional, Schultz, M., additional, Stein, O., additional, Suttie, A. M., additional, Valdebenito, A., additional, Zerefos, C., additional, Dufour, G., additional, Bergametti, G., additional, and Flaud, J.-M., additional

Published
2011
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