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391 results on '"Drummond, J. R."'

11. An Introduction to the Mars Atmospheric Trace Molecule Occultation Spectrometer (MATMOS)

Author

Wennberg, P. O, Hipkin, V. J, Drummond, J. R, Toon, G. C, Allen, M, Blavier, J.-F, Brown, L. R, Kleinbohl, A, Abbatt, J. P. D, Lollar, B. Sherwood, Strong, K, Walker, K. A, Bernath, P .F, Clancy, R. T, Cloutis, E. A, DesMarais, D. J, Eiler, J. M, Yung, Y. L, Encrenaz, T, and McConnell, J. C

Subjects
Lunar And Planetary Science And Exploration
Published
2011

13. Southern Hemisphere Carbon Monoxide Inferannual Variability Observed by Terra/Measurement of Pollution in the Troposphere (MOPITT)

Author

Edwards, D. P, Petron, G, Novelli, P. C, Emmons, L. K, Gille, J. C, and Drummond, J. R

Subjects
Meteorology And Climatology
Abstract

Biomass burning is an annual occurrence in the tropical southern hemisphere (SH) and represents a major source of regional pollution. Vegetation fires emit carbon monoxide (CO), which due to its medium lifetime is an excellent tracer of tropospheric transport. CO is also one of the few tropospheric trace gases currently observed from satellite and this provides long-term global measurements. In this paper, we use the 5 year CO data record from the Measurement Of Pollution In The Troposphere (MOPITT) instrument to examine the inter-annual variability of the SH CO loading and show how this relates to climate conditions which determine the intensity of fire sources. The MOPITT observations show an annual austral springtime peak in the SH zonal CO loading each year with dry-season biomass burning emissions in S. America, southern Africa, the Maritime Continent, and northwestern Australia. Although fires in southern Africa and S. America typically produce the greatest amount of CO, the most significant inter-annual variation is due to varying fire activity and emissions from the Maritime Continent and northern Australia. We find that this variation in turn correlates well with the El Nino Southern Oscillation precipitation index. Between 2000 and 2005, emissions were greatest in late 2002 and an inverse modeling of the MOPITT data using the MOZART chemical transport model estimates the southeast Asia regional fire source for the year August 2002 to September 2003 to be 52 Tg CO. Comparison of the MOPITT retrievals and NOAA surface network measurements indicate that the latter do not fully capture the inter-annual variability or the seasonal range of the CO zonal average concentration due to biases associated with atmospheric and geographic sampling.

Published
2010
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19. Investigation of CO, C2H6 and aerosols in a boreal fire plume over eastern Canada during BORTAS 2011 using ground- and satellite-based observations and model simulations

Author

Griffin, D., Walker, K. A., Franklin, J. E., Parrington, M., Whaley, C., Hopper, J., Drummond, J. R., Palmer, P. I., Strong, K., Duck, T. J., Abboud, I., Bernath, P. F., Clerbaux, Cathy, Coheur, Pierre-François, Curry, K. R., Dan, L., Hyer, E., Kliever, J., Lesins, G., Maurice, M., Saha, A., Tereszchuk, K., Weaver, D., Department of Physics [Toronto], University of Toronto, Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], School of Geosciences [Edinburgh], University of Edinburgh, AEROCAN Network, Université de Sherbrooke (UdeS)-Environment and Climate Change Canada, Department of Chemistry [York, UK], University of York [York, UK], Department of Chemistry and Biochemistry [Norfolk], Old Dominion University [Norfolk] (ODU), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Spectroscopie de l'atmosphère, Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), NRL's Marine Meteorology Division, Naval Research Laboratory (NRL), and Université de Sherbrooke (UdeS)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], lcsh:Chemistry, Physico-chimie générale, lcsh:QD1-999, [SDE]Environmental Sciences, lcsh:Physics, lcsh:QC1-999
Abstract

We present the results of total column measurements of CO, C2H6 and fine-mode aerosol optical depth (AOD) during the "Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites" (BORTAS-B) campaign over eastern Canada. Ground-based observations, using Fourier transform spectrometers (FTSs) and sun photometers, were carried out in July and August 2011. These measurements were taken in Halifax, Nova Scotia, which is an ideal location to monitor the outflow of boreal fires from North America, and also in Toronto, Ontario. Measurements of fine-mode AOD enhancements were highly correlated with enhancements in coincident trace gas (CO and C2H6) observations between 19 and 21 July 2011, which is typical for a smoke plume event. In this paper, we focus on the identification of the origin and the transport of this smoke plume. We use back trajectories calculated by the Canadian Meteorological Centre as well as FLEXPART forward trajectories to demonstrate that the enhanced CO, C2H6 and fine-mode AOD seen near Halifax and Toronto originated from forest fires in northwestern Ontario that occurred between 17 and 19 July 2011. In addition, total column measurements of CO from the satellite-borne Infrared Atmospheric Sounding Interferometer (IASI) have been used to trace the smoke plume and to confirm the origin of the CO enhancement. Furthermore, the enhancement ratio-that is, in this case equivalent to the emission ratio (ERC2H6/CO)-was estimated from these ground-based observations. These C2H6 emission results from boreal fires in northwestern Ontario agree well with C2H6 emission measurements from other boreal regions, and are relatively high compared to fires from other geographical regions. The ground-based CO and C2H6 observations were compared with outputs from the 3-D global chemical transport model GEOS-Chem, using the Fire Locating And Modeling of Burning Emissions (FLAMBE) inventory. Agreement within the stated measurement uncertainty (∼3% for CO and ∼8% for C2H6) was found for the magnitude of the enhancement of the CO and C2H6 total columns between the measured and modelled results. However, there is a small shift in time (of approximately 6 h) of arrival of the plume over Halifax between the results. © Author(s) 2013., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2013

20. Broadening and line mixing in the 20 00←01 10, 11 10←00 00 and 12 20←01 10 Q branches of carbon dioxide: Experimental results and energy-corrected sudden modeling.

Author

Predoi-Cross, A., May, A. D., Vitcu, A., Drummond, J. R., Hartmann, J.-M., and Boulet, C.

Subjects
MIXING, FLUID dynamics, HYDRODYNAMICS, CARBON dioxide, CARBON compounds, SPECTROMETERS, FOURIER analysis
Abstract

Using both a difference frequency spectrometer and a Fourier transform spectrometer, we have measured transitions in the 1220←01 10 band of carbon dioxide at room temperature and pressures up to 19 atm. The low-pressure spectra were analyzed using a variety of standard spectral profiles, all with an asymmetric component to account for weak line mixing. For this band, we have been able to retrieve experimental line strengths and the broadening and weak mixing parameters. In this paper we also compare the suitability of the energy-corrected sudden model to predict mixing in the two previously measured Q branches 2000←01 10, the 11 10←00 00, and the present Q branch of pure CO2, all at room temperature. [ABSTRACT FROM AUTHOR]

Published
2004
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21. Shifting and broadening in the fundamental band of CO highly diluted in He and Ar: A comparison with theory.

Author

Luo, Caiyan, Wehr, R., Drummond, J. R., May, A. D., Thibault, F., Boissoles, J., Launay, J. M., Boulet, C., Bouanich, J.-P., and Hartmann, J.-M.

Subjects
CARBON monoxide, DILUTION
Abstract

We present measurements of the shifts and widths of the rovibrational lines of the fundamental band of CO highly diluted in He and Ar at 296 K. The shifts are decomposed into parts odd and even in the line number, m. These are then compared with close coupled calculations carried out with the best known interaction potentials. There is general agreement between the calculated and measured values of the broadening and shifting. Furthermore, the results illustrate that the decomposition of the shifts into parts, odd and even in m, is a powerful tool for separating out the relative contributions of the isotropic and anisotropic part of the interaction to the shifts and which part needs to be corrected if there is a discrepancy. Thus, shift measurements can be added to the list of experiments that may be used to determine reliable interaction potentials. The results also show, given a potential, that close coupled calculations are accurate and could be used to confirm or establish empirical models of the temperature dependence of the broadening or shifting, etc. Such modeling is important at atmospheric physics. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2001
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23. Intercomparison of ground-based ozone and NO2 measurements during the MANTRA 2004 campaign

Author

Fraser, A., Bernath, P. F., Blatherwick, R. D., Drummond, J. R., Fogal, P. F., Fu, D., Goutail, F., Kerzenmacher, T. E., McElroy, C. T., Midwinter, C., Olson, J. R., Strong, K., Walker, K. A., Wunch, D., and Young, I. J.

Subjects
lcsh:Chemistry, lcsh:QD1-999, Caltech Library Services, lcsh:Physics, lcsh:QC1-999
Abstract

The MANTRA (Middle Atmosphere Nitrogen TRend Assessment) 2004 campaign took place in Vanscoy, Saskatchewan, Canada (52° N, 107° W) from 3 August to 15 September, 2004. In support of the main balloon launch, a suite of five zenith-sky and direct-Sun-viewing UV-visible ground-based spectrometers was deployed, primarily measuring ozone and NO2 total columns. Three Fourier transform spectrometers (FTSs) that were part of the balloon payload also performed ground-based measurements of several species, including ozone. Ground-based measurements of ozone and NO2 differential slant column densities from the zenith-viewing UV-visible instruments are presented herein. They are found to partially agree within NDACC (Network for the Detection of Atmospheric Composition Change) standards for instruments certified for process studies and satellite validation. Vertical column densities of ozone from the zenith-sky UV-visible instruments, the FTSs, a Brewer spectrophotometer, and ozonesondes are compared, and found to agree within the combined error estimates of the instruments (15%). NO2 vertical column densities from two of the UV-visible instruments are compared, and are also found to agree within combined error (15%).

Published
2007

25. Departures from the soft collision model for Dicke narrowing: Raman measurements in the Q branch of D2.

Author

Forsman, J. W., Sinclair, P. M., May, A. D., Duggan, P., and Drummond, J. R.

Subjects
COLLISIONS (Nuclear physics), RAMAN effect
Abstract

With high quality spectral data, we have observed departures from the soft collision model for translational motion, in the transition region from Doppler broadening to Dicke narrowing. The departures are in agreement with theoretical calculations based on the Boltzmann equation. The implications of the results concerning the dynamics of fluids are discussed. In addition we show that the mass diffusion constant describes the translational diffusion of the optical coherence and we give precise measurements of the broadening coefficients of the Q(0) to Q(6) lines. [ABSTRACT FROM AUTHOR]

Published
1992
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28. Severe 2011 ozone depletion assessed with 11 years of ozone, NO2, and OClO measurements at 80°N

Author

Adams, C., Strong, K., Zhao, X., Bassford, M. R., Chipperfield, M., Daffer, W. H., Drummond, J. R., Farahani, E., Feng, W., Fraser, A., Goutail, Florence, Manney, G. L., Mclinden, C. A., Pazmino, Andrea, Rex, M., Walker, K. A., Department of Physics [Toronto], University of Toronto, RAND Europe [Cambridge], School of Earth and Environment [Leeds] (SEE), University of Leeds, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], School of Geosciences [Edinburgh], University of Edinburgh, STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), Air Quality Research Division [Toronto], Environment and Climate Change Canada, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Department of Chemistry [Waterloo], University of Waterloo [Waterloo], and California Institute of Technology (CALTECH)-NASA

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], DOAS, PEARL, CANDAC, Polar vortex, UV-visible spectroscopy, Arctic ozone depletion
Abstract

International audience; Unusually cold conditions in Arctic winter 2010/11 led to large stratospheric ozone loss. We investigate this with UV-visible measurements made at Eureka, Canada (80.05°N, 86.42°W) from 1999-2011. For 8-22 March 2011, OClO was enhanced, indicating chlorine activation above Eureka. Ozone columns were lower than in any other year in the record, reaching minima of 237 DU and 247 DU in two datasets. The average NO2 column inside the vortex, measured at visible and UV wavelengths, was 46±30% and 45±27% lower in 2011 than the average NO2 column from previous years. Ozone column loss was estimated from two ozone datasets, using a modeled passive ozone tracer. For 12-20 March 2011, the average ozone loss was 27% and 29% (99 DU and 108 DU). The largest percent ozone loss in the 11-year record of 47% (250 DU and 251 DU) was observed on 5 April 2011.

Published
2012

29. Validation of ACE and OSIRIS ozone and NO2 measurements using ground-based instruments at 80° N

Author

Adams, C., Strong, K., Batchelor, R. L., Bernath, P. F., Brohede, S., Boone, C., Degenstein, D., Daffer, W. H., Drummond, J. R., Fogal, P. F., Farahani, E., Fayt, C., Fraser, A., Goutail, Florence, Hendrick, F., Kolonjari, F., Lindenmaier, R., Manney, G., Mcelroy, C. T., Mclinden, C. A., Mendonca, J., Park, J.-H., Pavlovic, B., Pazmino, Andrea, Roth, C., Savastiouk, V., Walker, K. A., Weaver, D., Zhao, X., Department of Physics [Toronto], University of Toronto, NCAR Earth Systems Laboratory (NESL), National Center for Atmospheric Research [Boulder] (NCAR), Department of Chemistry [York, UK], University of York [York, UK], Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Chemistry and Biochemistry [Norfolk], Old Dominion University [Norfolk] (ODU), Department of Earth and Space Sciences [Göteborg], Chalmers University of Technology [Göteborg], University of Saskatchewan [Saskatoon] (U of S), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), School of Geosciences [Edinburgh], University of Edinburgh, STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), Air Quality Research Division [Toronto], Environment and Climate Change Canada, York University [Toronto], Full Spectrum Science Inc. [Toronto], National Aeronautics and Space Administration (NASA), Belgian PRODEX SECPEA and A3C projects, European Commission, European Project: GEOMON, European Project: 284421,EC:FP7:SPA,FP7-SPACE-2011-1,NORS(2011), and California Institute of Technology (CALTECH)-NASA

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], lcsh:TA715-787, lcsh:Earthwork. Foundations, lcsh:TA170-171, lcsh:Environmental engineering
Abstract

The Optical Spectrograph and Infra-Red Imager System (OSIRIS) and the Atmospheric Chemistry Experiment (ACE) have been taking measurements from space since 2001 and 2003, respectively. This paper presents intercomparisons between ozone and NO2 measured by the ACE and OSIRIS satellite instruments and by ground-based instruments at the Polar Environment Atmospheric Research Laboratory (PEARL), which is located at Eureka, Canada (80° N, 86° W) and is operated by the Canadian Network for the Detection of Atmospheric Change (CANDAC). The ground-based instruments included in this study are four zenith-sky differential optical absorption spectroscopy (DOAS) instruments, one Bruker Fourier transform infrared spectrometer (FTIR) and four Brewer spectrophotometers. Ozone total columns measured by the DOAS instruments were retrieved using new Network for the Detection of Atmospheric Composition Change (NDACC) guidelines and agree to within 3.2%. The DOAS ozone columns agree with the Brewer spectrophotometers with mean relative differences that are smaller than 1.5%. This suggests that for these instruments the new NDACC data guidelines were successful in producing a homogenous and accurate ozone dataset at 80° N. Satellite 14-52 km ozone and 17-40 km NO2 partial columns within 500 km of PEARL were calculated for ACE-FTS Version 2.2 (v2.2) plus updates, ACE-FTS v3.0, ACE-MAESTRO (Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) v1.2 and OSIRIS SaskMART v5.0x ozone and Optimal Estimation v3.0 NO2 data products. The new ACE-FTS v3.0 and the validated ACE-FTS v2.2 partial columns are nearly identical, with mean relative differences of 0.0 ± 0.2% for ozone and -0.2 ± 0.1% for v2.2 minus v3.3 NO2. Ozone columns were constructed from 14-52 km satellite and 0-14 km ozonesonde partial columns and compared with the ground-based total column measurements. The satellite-plus-sonde measurements agree with the ground-based ozone total columns with mean relative differences of 0.1-7.3%. For NO2, partial columns from 17 km upward were scaled to noon using a photochemical model. Mean relative differences between OSIRIS, ACE-FTS and ground-based NO2 measurements do not exceed 20%. ACE-MAESTRO measures more NO2 than the other instruments, with mean relative differences of 25-52%. Seasonal variation in the differences between partial columns is observed, suggesting that there are systematic errors in the measurements, the photochemical model corrections, and/or in the coincidence criteria. For ozone spring-time measurements, additional coincidence criteria based on stratospheric temperature and the location of the polar vortex were found to improve agreement between some of the instruments. For ACE-FTS v2.2 minus Bruker FTIR, the 2007-2009 spring-time mean relative difference improved from -5.0 ± 0.4% to -3.1 ± 0.8% with the dynamical selection criteria. This was the largest improvement, likely because both instruments measure direct sunlight and therefore have well-characterized lines-of-sight compared with scattered sunlight measurements. For NO2, the addition of a ±1° latitude coincidence criterion improved spring-time intercomparison results, likely due to the sharp latitudinal gradient of NO2 during polar sunrise. The differences between satellite and ground-based measurements do not show any obvious trends over the missions, indicating that both the ACE and OSIRIS instruments continue to perform well.

Published
2012

30. Characteristics of Arctic tides at CANDAC-PEARL (80 degrees N, 86 degrees W) and Svalbard (78 degrees N, 16 degrees E) for 2006-2009 : radar observations and comparisons with the model CMAM-DAS

Author

Manson, Alan, Meek, Chris, Xu, X., Aso, Takehiko, Drummond, J. R., Hall, Chris, Hocking, W. K., Tsutsumi, Masaki, and Ward, W. E.

Subjects
VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453, VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453
Abstract

Operation of a Meteor Radar (MWR) at Eureka, Ellesmere Island (80° N, 86° W) began in February 2006: this is the location of the Polar Environmental and Atmospheric Research Laboratory (PEARL), operated by the "Canadian Network for the Detection of Atmospheric Change" (CANDAC). The first 36 months of tidal wind data (82–97 km) are here combined with contemporaneous tides from the Meteor Radar (MWR) at Adventdalen, Svalbard (78° N, 16° E), to provide the first significant evidence for interannual variability (IAV) of the High Arctic's diurnal and semidiurnal migrating (MT) and non-migrating tides (NMT). The three-year monthly means for both diurnal (DT) and semi-diurnal (SDT) winds demonstrate significantly different amplitudes and phases at Eureka and Svalbard. Typically the summer-maximizing DT is much larger (~24 m s−1 at 97 km) at Eureka, while the Svalbard tide (5–24 m s−1 at 97 km)) is almost linear (north-south) rather than circular. Interannual variations are smallest in the summer and autumn months. The High Arctic SDT has maxima centred on August/September, followed in size by the winter features; and is much larger at Svalbard (24 m s−1 at 97 km, versus 14–18 m s−1 in central Canada). Depending on the location, the IAV are largest in spring/winter (Eureka) and summer/autumn (Svalbard). Fitting of wave-numbers for the migrating and non-migrating tides (MT, NMT) determines dominant tides for each month and height. Existence of NMT is consistent with nonlinear interactions between migrating tides and (quasi) stationary planetary wave (SPW) S=1 (SPW1). For the diurnal oscillation, NMT s=0 for the east-west (EW) wind component dominates (largest tide) in the late autumn and winter (November–February); and s=+2 is frequently seen in the north-south (NS) wind component for the same months. The semi-diurnal oscillation's NMT s=+1 dominates from March to June/July. There are patches of s=+3 and +1, in the late fall-winter. These wave numbers are also consistent with SPW1-MT interactions. Comparisons for 2007 of the observed DT and SDT at 78–80° N, with those within the Canadian Middle Atmosphere Model Data Assimilation System CMAM-DAS, are a major feature of this paper. The diurnal tides for the two locations have important similarities as observed and modeled, with seasonal maxima in the mesosphere from April to October, and similar phases with long/evanescent wavelengths. However, differences are also significant: observed Eureka amplitudes are generally larger than the model; and at Svalbard the modeled tide is classically circular, rather than anomalous. For the semi-diurnal tide, the amplitudes and phases differ markedly between Eureka and Svalbard for both MWR-radar data and CMAM-DAS data. The seasonal variations from observed and modeled archives also differ at each location. Tidal NMT-amplitudes and wave-numbers for the model differ substantially from observations.

Published
2011

31. Characteristics of Arctic winds at CANDAC-PEARL (80 degrees N, 86 degrees W) and Svalbard (78 degrees N, 16 degrees E) for 2006-2009: radar observations and comparisons with the model CMAM-DAS

Author

Hall, Chris, Manson, Alan, Meek, Chris, Xu, X, Aso, Takehiko, Drummond, J. R., Hocking, W. K., Tsutsumi, Masaki, and Ward, W. E.

Subjects
VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453, VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453
Abstract

Operation of a Meteor Wind Radar (MWR) at Eureka, Ellesmere Island (80° N, 86° W) began in February 2006; this is the location of the Polar Environmental and Atmospheric Research Laboratory (PEARL), operated by the "Canadian Network for the Detection of Atmospheric Change" (CANDAC). The first 36 months of wind data (82–97 km) are here combined with contemporaneous winds from the Meteor Wind Radar at Adventdalen, Svalbard (78° N, 16° E), to provide the first evidence for substantial interannual variability (IAV) of longitudinally spaced observations of mean/background winds and waves at such High Arctic latitudes. The influences of "Sudden Stratospheric Warmings" (SSW) are also apparent. Monthly meridional (north-south, NS) 3-year means for each location/radar demonstrate that winds (82–97 km) differ significantly between Canada and Norway, with winter-equinox values generally northward over Eureka and southward over Svalbard. Using January 2008 as case study, these oppositely directed meridional winds are related to mean positions of the Arctic mesospheric vortex. The vortex is from the Canadian Middle Atmosphere Model, with its Data Assimilation System (CMAM-DAS). The characteristics of "Sudden stratospheric Warmings" SSW in each of the three winters are noted, as well as their uniquely distinctive short-term mesospheric wind disturbances. Comparisons of the mean winds over 36 months at 78 and 80° N, with those within CMAM-DAS, are featured. E.g. for 2007, while both monthly mean EW and NS winds from CMAM/radar are quite similar over Eureka (82–88 km), the modeled autumn-winter NS winds over Svalbard (73–88 km) differ significantly from observations. The latter are southward, and the modeled winds over Svalbard are predominately northward. The mean positions of the winter polar vortex are related to these differences.

Published
2011

32. Intercomparison of ground-based and satellite NO2measurements above eureka, Nunavut

Author

Adams, C., Strong, K., Lindenmaier, Rodica, Batchelor, R., Park, J.-H., Weaver, D., Fraser, A., Mendonca, J., Drummond, J. R., Goutail, Florence, Pazmino, Andrea, Walker, K. A., Bernath, P., Boone, C., Mcelroy, C. T., Degenstein, D., Mclinden, C. A., Manney, G., Daffer, W., Adams, Christopher, Department of Physics [Toronto], University of Toronto, National Center for Atmospheric Research [Boulder] (NCAR), Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Chemistry [York, UK], University of York [York, UK], Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Air Quality Research Division [Toronto], Environment and Climate Change Canada, University of Saskatchewan [Saskatoon] (U of S), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Facultad de Quimica [Santiago], Pontificia Universidad Católica de Chile (UC), and Cardon, Catherine

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Published
2010

33. Characterizing the Chemistry of the Polar Stratosphere above Eureka, Canada with Ground-Based and Satellite Instruments During IPY

Author

Adams, C., Strong, K., Lindenmaier, R., Batchelor, R., Park, J.-H., Fraser, A., Mendonca, J., Drummond, J. R., Goutail, Florence, Pazmino, Andrea, Walker, K. A., Bernath, P., Boone, C., Degenstein, D., Mclinden, C. A., Manney, G., Daffer, W., Department of Physics [Toronto], University of Toronto, National Center for Atmospheric Research [Boulder] (NCAR), Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Chemistry [York, UK], University of York [York, UK], Department of Chemistry [Waterloo], University of Waterloo [Waterloo], University of Saskatchewan [Saskatoon] (U of S), Air Quality Research Division [Toronto], Environment and Climate Change Canada, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), and Cardon, Catherine

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

Arctic stratospheric ozone varies greatly year-to-year and season-to-season as it depends on stratospheric dynamics and concentrations of other highly variable trace gases. One of these trace gases is NO2, which is involved in catalytic ozone depletion cycles in the upper stratosphere but can prevent spring-time ozone depletion in the lower stratosphere. NO2 has a short lifetime in the stratosphere, so concentrations depend strongly on available sunlight, which varies greatly throughout the year in the Arctic. We will investigate the variability of Arctic ozone, NO2 and related constituents through the sunlit parts of the International Polar Year with measurements taken at the Polar Environment Atmospheric Research Laboratory (PEARL) in Eureka, Nunavut, Canada (80oN, 86oW). We will compare measurements from three ground-based UV-visible spectrometers and a Bruker 125HR Fourier transform infrared spectrometer with ACE and OSIRIS satellite measurements. Furthermore, we will discuss the seasonal, day-to-day, and diurnal variations of these species and will relate these measurements to available sunlight and dynamical conditions above Eureka.

Published
2010

35. Arctic tidal characteristics at Eureka (80 degrees N, 86 degrees W) and Svalbard (78 degrees N, 16 degrees E) for 2006/07 : seasonal and longitudinal variations, migrating and non-migrating tides

Author

Hall, Chris, Manson, Alan, Meek, Chris, Chshyolkova, Tatyana, Xu, X., Aso, Takehiko, Drummond, J. R., Hocking, Wayne, Jacobi, Ch., Tsutsumi, Masaki, and Ward, W.

Subjects
VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453, VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453
Published
2009

36. Validation of water vapour profiles from the Atmospheric Chemistry Experiment (ACE)

Author

Carleer, M. R., Boone, C. D., Walker, K. A., Bernath, P. F., Strong, K., Sica, R. J., Randall, C. E., Vömel, H., Kar, J., Höpfner, M., Milz, M., Von Clarmann, T., Kivi, R., Valverde-Canossa, J., Sioris, C. E., Izawa, M. R. M., Dupuy, E., Mcelroy, C. T., Drummond, J. R., Nowlan, C. R., Zou, J., Nichitiu, F., Lossow, S., Urban, Jakub, Murtagh, D., Dufour, D. G., Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Physics [Toronto], University of Toronto, Department of Chemistry, Department of Physics and Astronomy [London, ON], University of Western Ontario (UWO), Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado [Boulder]-National Oceanic and Atmospheric Administration (NOAA), Forschungszentrum Karlsruhe and Universität Karlsruhe, Finnish Meteorological Institute (FMI), Universidad Nacional, UNIVERSIDAD NACIONAL, Environment and Climate Change Canada, Department of Earth Sciences [London, ON], Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], Department of Meteorology [Stockholm] (MISU), Stockholm University, Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Picomole Instruments Inc., and EGU, Publication

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere
Abstract

International audience; The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Water vapour (H2O), one of the most important molecules for climate and atmospheric chemistry, is one of the key species provided by the two principal instruments, the infrared Fourier Transform Spectrometer (ACE-FTS) and the MAESTRO UV-Visible spectrometer (ACE-MAESTRO). The first instrument performs measurements on several lines in the 1362?2137 cm?1 range, from which vertically resolved H2O concentration profiles are retrieved, from 7 to 90 km altitude. ACE-MAESTRO measures profiles using the water absorption band in the near infrared part of the spectrum at 926.0?969.7 nm. This paper presents a comprehensive validation of the ACE-FTS profiles. We have compared the H2O volume mixing ratio profiles with space-borne (SAGE II, HALOE, POAM III, MIPAS, SMR) observations and measurements from balloon-borne frostpoint hygrometers and a ground based lidar. We show that the ACE-FTS measurements provide H2O profiles with small retrieval uncertainties in the stratosphere (better than 5% from 15 to 70 km, gradually increasing above). The situation is unclear in the upper troposphere, due mainly to the high variability of the water vapour volume mixing ratio in this region. A new water vapour data product from the ACE-MAESTRO (Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) is also presented and initial comparisons with ACE-FTS are discussed.

Published
2008

37. Validation of NO2 and NO from the Atmospheric Chemistry Experiment (ACE)

Author

Kerzenmacher, T., Wolff, M. A., Strong, K., Dupuy, E., Walker, K. A., Amekudzi, L. K., Batchelor, R. L., Bernath, P. F., Berthet, Gwenaël, Blumenstock, T., Boone, C. D., Bramstedt, K., Brogniez, C., Brohede, S., Burrows, J. P., Catoire, Valéry, Dodion, J., Drummond, J. R., Dufour, D. G., Funke, B., Fussen, D., Goutail, Florence, Griffith, D. W. T., Haley, C. S., Hendrick, F., Höpfner, M., Huret, Nathalie, Jones, N., Kar, J., Kramer, I., Llewellyn, E. J., López-Puertas, M., Manney, G., Mcelroy, C. T., Mclinden, C. A., Melo, S., Mikuteit, S., Murtagh, D., Nichitiu, F., Notholt, J., Nowlan, C., Piccolo, C., Pommereau, Jean-Pierre, Randall, C., Raspollini, P., Ridolfi, M., Richter, A., Schneider, M., Schrems, O., Silicani, M., Stiller, G. P., Taylor, James, Tétard, C., Toohey, M., Vanhellemont, F., Warneke, T., Zawodny, J. M., Zou, J., Department of Physics [Toronto], University of Toronto, Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Institut für Umweltphysik [Bremen] (IUP), Universität Bremen, Department of Chemistry [York, UK], University of York [York, UK], Laboratoire de physique et chimie de l'environnement (LPCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], Picomole Instruments Inc., Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), School of Chemistry [Wollongong], University of Wollongong [Australia], Centre for Research in Earth and Space Science [Toronto] (CRESS), York University [Toronto], Institute of Space and Atmospheric Studies [Saskatoon] (ISAS), Department of Physics and Engineering Physics [Saskatoon], University of Saskatchewan [Saskatoon] (U of S)-University of Saskatchewan [Saskatoon] (U of S), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), Environment and Climate Change Canada, Canadian Space Agency (CSA), Department of Atmospheric, Oceanic and Planetary Physics [Oxford] (AOPP), University of Oxford, Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], Department of Atmospheric and Oceanic Sciences [Boulder] (ATOC), Istituto di Fisica Applicata 'Nello Carrara' (IFAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Dipartimento di Chimica Fisica e Inorganica [Bologna], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), NASA Langley Research Center [Hampton] (LaRC), Institut für Umweltphysik [Bremen] ( IUP ), Laboratoire de physique et chimie de l'environnement ( LPCE ), Institut national des sciences de l'Univers ( INSU - CNRS ) -Université d'Orléans ( UO ) -Centre National de la Recherche Scientifique ( CNRS ), Institut für Meteorologie und Klimaforschung ( IMK ), Karlsruher Institut für Technologie ( KIT ), Laboratoire d’Optique Atmosphérique - UMR 8518 ( LOA ), Institut national des sciences de l'Univers ( INSU - CNRS ) -Université de Lille-Centre National de la Recherche Scientifique ( CNRS ), Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique ( BIRA-IASB ), Instituto de Astrofísica de Andalucía ( IAA ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ), Service d'aéronomie ( SA ), Université de Versailles Saint-Quentin-en-Yvelines ( UVSQ ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), University of Wollongong, Centre for Research in Earth and Space Science [Toronto] ( CRESS ), Institute of Space and Atmospheric Studies [Saskatoon] ( ISAS ), University of Saskatchewan [Saskatoon] ( U of S ), Jet Propulsion Laboratory ( JPL ), NASA-California Institute of Technology ( CALTECH ), New Mexico Institute of Mining and Technology [New Mexico Tech] ( NMT ), Canadian Space Agency ( CSA ), Department of Atmospheric, Oceanic and Planetary Physics [Oxford] ( AOPP ), University of Oxford [Oxford], Laboratory for Atmospheric and Space Physics [Boulder] ( LASP ), University of Colorado Boulder [Boulder], Department of Atmospheric and Oceanic Sciences [Boulder] ( ATOC ), Istituto di Fisica Applicata 'Nello Carrara' ( IFAC ), Consiglio Nazionale delle Ricerche [Roma] ( CNR ), Università di Bologna [Bologna] ( UNIBO ), Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research ( AWI ), NASA Langley Research Center [Hampton] ( LaRC ), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille, Consejo Superior de Investigaciones Científicas [Spain] (CSIC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), California Institute of Technology (CALTECH)-NASA, Consiglio Nazionale delle Ricerche [Roma] (CNR), and Università di Bologna [Bologna] (UNIBO)

Subjects
lcsh:Chemistry, [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, lcsh:QD1-999, lcsh:Physics, lcsh:QC1-999
Abstract

Vertical profiles of NO2 and NO have been obtained from solar occultation measurements by the Atmospheric Chemistry Experiment (ACE), using an infrared Fourier Transform Spectrometer (ACE-FTS) and (for NO2) an ultraviolet-visible-near-infrared spectrometer, MAESTRO (Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation). In this paper, the quality of the ACE-FTS version 2.2 NO2 and NO and the MAESTRO version 1.2 NO2 data are assessed using other solar occultation measurements (HALOE, SAGE II, SAGE III, POAM III, SCIAMACHY), stellar occultation measurements (GOMOS), limb measurements (MIPAS, OSIRIS), nadir measurements (SCIAMACHY), balloon-borne measurements (SPIRALE, SAOZ) and ground-based measurements (UV-VIS, FTIR). Time differences between the comparison measurements were reduced using either a tight coincidence criterion, or where possible, chemical box models. ACE-FTS NO2 and NO and the MAESTRO NO2 are generally consistent with the correlative data. The ACE-FTS and MAESTRO NO2 volume mixing ratio (VMR) profiles agree with the profiles from other satellite data sets to within about 20% between 25 and 40 km, with the exception of MIPAS ESA (for ACE-FTS) and SAGE II (for ACE-FTS (sunrise) and MAESTRO) and suggest a negative bias between 23 and 40 km of about 10%. MAESTRO reports larger VMR values than the ACE-FTS. In comparisons with HALOE, ACE-FTS NO VMRs typically (on average) agree to ±8% from 22 to 64 km and to +10% from 93 to 105 km, with maxima of 21% and 36%, respectively. Partial column comparisons for NO2 show that there is quite good agreement between the ACE instruments and the FTIRs, with a mean difference of +7.3% for ACE-FTS and +12.8% for MAESTRO.

Published
2008

38. Validation of GOMOS-Envisat vertical profiles of O3, NO2, NO3, and aerosol extinction using balloon-borne instruments and analysis of the retrievals

Author

Bernath, P. F., Mcelroy, C. T., Abrams, M. C., Boone, C. D., Butler, M., Camy-Peyret, C., Carleer, M., Clerbaux, Cathy, Coheur, P.-F., Colin, R., De Cola, P., De Mazière, M., Drummond, J. R., Dufour, D., Evans, W. F. J., Fast, H., Fussen, D., Gilbert, K., Jennings, D. E., Llewellyn, E. J., Lowe, R. P., Mahieu, E., Mcconnell, J. C., Mchugh, M., Mcleod, S. D., Michaud, R., Midwinter, C., Nassar, R., Nichitiu, F., Nowlan, C., Rinsland, C. P., Rochon, Y. J., Rowlands, N., Semeniuk, K., Simon, P., Skelton, R., Sloan, J. J., Soucy, M.-A., Strong, K., Tremblay, P., Turnbull, D., Walker, K. A., Walkty, I., Wardle, D. A., Wehrle, V., Zander, R., Zou, J., Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Meteorological Service of Canada, Environment and Climate Change Canada, FastMetrix Inc., Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), NASA Headquarters, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Department of Physics [Toronto], University of Toronto, Department of Physics and Astronomy [Peterborough], Trent University, Department of Physics and Astronomy [London, ON], University of Western Ontario (UWO), NASA Goddard Space Flight Center (GSFC), Department of Physics and Engineering Physics [Saskatoon], University of Saskatchewan [Saskatoon] (U of S), Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Department of Earth and Space Science and Engineering [York University - Toronto] (ESSE), York University [Toronto], GATS Inc., Canadian Space Agency (CSA), NASA Langley Research Center [Hampton] (LaRC), EMS Technologies Canada Ltd., ABB Bomem Inc., Département de génie électrique et de génie informatique (GEL-GIF), Université Laval [Québec] (ULaval), Bristol Aerospace Ltd., and the European Space Agency (ESA), the French Space Agency (CNES) and the German Space Agency (DLR)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [SDU]Sciences of the Universe [physics], stratosphere, Validation, balloon
Abstract

The UV-visible Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument onboard Envisat performs nighttime measurements of ozone, NO2, NO3 and of the aerosol extinction, using the stellar occultation method. We have conducted a validation exercise using various balloon-borne instruments in different geophysical conditions from 2002 to 2006, using GOMOS measurements performed with stars of different magnitudes. GOMOS and balloon-borne vertical columns in the middle stratosphere are in excellent agreement for ozone and NO2. Some discrepancies can appear between GOMOS and balloon-borne vertical profiles for the altitude and the amplitude of the concentration maximum. These discrepancies are randomly distributed, and no bias is detected. The accuracy of individual profiles in the middle stratosphere is 10 % for ozone and 25 % for NO2. On the other hand, the GOMOS NO3 retrieval is difficult and no direct validation can be conducted. The GOMOS aerosol content is also well estimated, but the wavelength dependence can be better estimated if the aerosol retrieval is performed only in the visible domain. We can conclude that the GOMOS operational retrieval algorithm works well and that GOMOS has fully respected its primary objective for the study of the trends of species in the middle stratosphere, using the profiles in a statistical manner. Some individual profiles can be partly inaccurate, in particular in the lower stratosphere. Improvements could be obtained by reprocessing some GOMOS transmissions in case of specific studies in the middle and lower stratosphere when using the individual profiles.

Published
2008

39. Simultaneous ground-based observations of O3, HCl, N2O, and CH4 over Toronto, Canada by three Fourier transform spectrometers with different resolutions

Author

Wunch, D., Taylor, J. R., Fu, D., Bernath, P., Drummond, J. R., Midwinter, C., Strong, K., Walker, K. A., Department of Physics [Toronto], University of Toronto, Department of Chemistry, Department of Chemistry [York, UK], University of York [York, UK], Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], and EGU, Publication

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere
Abstract

An intercomparison of three Fourier transform spectrometers (FTSs) with significantly different resolutions is presented. The highest-resolution instrument has a maximum optical path difference of 250 cm, and the two lower-resolution instruments have maximum optical path differences of 50 cm and 25 cm. The results indicate that the two lower-resolution instruments can retrieve total column amounts of O3, HCl, N2O and CH4 using the SFIT2 retrieval code with percent differences from the high-resolution instrument generally better than 3%, with respect to the high-resolution FTS. Total column amounts of the stratospheric species (O3 and HCl) have larger differences than those of the tropospheric species (N2O and CH4). Instrument line shape (ILS) information is found to be of critical importance when retrieving total columns of stratospheric gases from the lower-resolution instruments. Including the ILS information in the retrievals significantly reduces the difference in total column amounts between the three instruments. The remaining errors for stratospheric species total column amounts can be attributed to the lower sensitivity of the lower-resolution FTSs to the stratosphere.

Published
2007

40. Evaluation of operational radiances for the Measurements of Pollution in the Troposphere (MOPITT) instrument CO thermal band channels

Author

Deeter, M.-N., Emmons, L.-K., Francis, G.-L., Edwards, D.-P., Gille, J.-C., Warner, J., Khattatov, B., Ziskin, D.-C., Lamarque, J.-C., Ho, S.-P., Yundin, V., Attié, Jean-Luc, Packman, D., Chen, Jie, Mao, D., Drummond, J. R., Novelli, P., Sachse, G., National Center for Atmospheric Research [Boulder] (NCAR), Laboratoire d'aérologie (LAERO), 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), Department of Physics [Toronto], University of Toronto, NOAA Climate Monitoring and Diagnostics Laboratory (CMDL), National Oceanic and Atmospheric Administration (NOAA), NASA Langley Research Center [Hampton] (LaRC), 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
validation, radiative transfer model, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], MOPITT
Abstract

The ability of operational radiative transfer models to accurately predict remote sensing instrument observations (e.g., calibrated radiances) over a wide variety of geophysical situations is critical to the performance of trace gas retrieval algorithms. As part of the validation of the Measurements of Pollution in the Troposphere (MOPITT) satellite instrument, we present a technique for comparing operational calibrated thermal band (4.7 μm) Earth-view MOPITT radiances with corresponding values calculated using the MOPITT operational radiative transfer model. In situ carbon monoxide (CO) profiles sampled from aircraft in coordination with MOPITT overpasses serve as the foundation for MOPITT validation. Characteristics of radiance errors due to in situ sampling characteristics, CO temporal and spatial variability, and surface emissivity are discussed. Results indicate that radiance biases for most of the MOPITT thermal channel radiances are typically on the order of 1%. Observed radiance biases are largest and most variable for the pressure modulation cell difference-signal radiances, probably because of the lack of in situ data in the upper troposphere and lower stratosphere.

Published
2004

42. A case study of aerosol scavenging in a biomass burning plume over eastern Canada during the 2011 BORTAS field experiment

Author

Franklin, J. E., primary, Drummond, J. R., additional, Griffin, D., additional, Pierce, J. R., additional, Waugh, D. L., additional, Palmer, P. I., additional, Parrington, M., additional, Lee, J. D., additional, Lewis, A. C., additional, Rickard, A. R., additional, Taylor, J. W., additional, Allan, J. D., additional, Coe, H., additional, Walker, K. A., additional, Chisholm, L., additional, Duck, T. J., additional, Hopper, J. T., additional, Blanchard, Y., additional, Gibson, M. D., additional, Curry, K. R., additional, Sakamoto, K. M., additional, Lesins, G., additional, Dan, L., additional, Kliever, J., additional, and Saha, A., additional

Published
2014
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44. A case study of aerosol depletion in a biomass burning plume over Eastern Canada during the 2011 BORTAS field experiment

Author

Franklin, J. E., primary, Drummond, J. R., additional, Griffin, D., additional, Pierce, J. R., additional, Waugh, D. L., additional, Palmer, P. I., additional, Parrington, M., additional, Lee, J. D., additional, Lewis, A. C., additional, Rickard, A. R., additional, Taylor, J. W., additional, Allan, J. D., additional, Coe, H., additional, Walker, K. A., additional, Chisholm, L., additional, Duck, T. J., additional, Hopper, J. T., additional, Blanchard, Y., additional, Gibson, M. D., additional, Curry, K. R., additional, Sakamoto, K. M., additional, Lesins, G., additional, Dan, L., additional, Kliever, J., additional, and Saha, A., additional

Published
2014
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50. Investigation of CO, C2H6 and aerosols in a boreal fire plume over eastern Canada during BORTAS 2011 using ground- and satellite-based observations, and model simulations

Author

Griffin, D., primary, Walker, K. A., additional, Franklin, J. E., additional, Parrington, M., additional, Whaley, C., additional, Hopper, J., additional, Drummond, J. R., additional, Palmer, P. I., additional, Strong, K., additional, Duck, T. J., additional, Abboud, I., additional, Bernath, P. F., additional, Clerbaux, C., additional, Coheur, P.-F., additional, Curry, K. R., additional, Dan, L., additional, Hyer, E., additional, Kliever, J., additional, Lesins, G., additional, Maurice, M., additional, Saha, A., additional, Tereszchuk, K., additional, and Weaver, D., additional

Published
2013
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