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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 8, 5189-5211, 2015
http://www.atmos-meas-tech.net/8/5189/2015/
doi:10.5194/amt-8-5189-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
10 Dec 2015
Tropospheric Emission Spectrometer (TES) satellite observations of ammonia, methanol, formic acid, and carbon monoxide over the Canadian oil sands: validation and model evaluation
M. W. Shephard1, C. A. McLinden1, K. E. Cady-Pereira2, M. Luo3, S. G. Moussa1, A. Leithead1, J. Liggio1, R. M. Staebler1, A. Akingunola1, P. Makar1, P. Lehr1, J. Zhang1, D. K. Henze4, D. B. Millet5, J. O. Bash6, L. Zhu7, K. C. Wells5, S. L. Capps4,6, S. Chaliyakunnel5, M. Gordon1,8, K. Hayden1, J. R. Brook1, M. Wolde9, and S.-M. Li1 1Environment Canada, Toronto, Ontario, Canada
2Atmospheric and Environmental Research (AER), Lexington, Massachusetts, USA
3Jet Propulsion Laboratory (JPL), California Institute of Technology, Pasadena, California, USA
4Department of Mechanical Engineering, University of Colorado, Boulder, Colorado, USA
5Department of Soil, Water, and Climate, University of Minnesota, Minneapolis-St. Paul, Minnesota, USA
6US Environmental Protection Agency, Research Triangle Park, North Carolina, USA
7Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
8Department of Earth and Space Science Engineering, York University, Toronto, Ontario, Canada
9National Research Council (NRC) of Canada, Ottawa, Ontario, Canada
Abstract. The wealth of air quality information provided by satellite infrared observations of ammonia (NH3), carbon monoxide (CO), formic acid (HCOOH), and methanol (CH3OH) is currently being explored and used for a number of applications, especially at regional or global scales. These applications include air quality monitoring, trend analysis, emissions, and model evaluation. This study provides one of the first direct validations of Tropospheric Emission Spectrometer (TES) satellite-retrieved profiles of NH3, CH3OH, and HCOOH through comparisons with coincident aircraft profiles. The comparisons are performed over the Canadian oil sands region during the intensive field campaign (August–September, 2013) in support of the Joint Canada–Alberta Implementation Plan for Oil Sands Monitoring (JOSM). The satellite/aircraft comparisons over this region during this period produced errors of (i) +0.08 ± 0.25 ppbv for NH3, (ii) +7.5 ± 23 ppbv for CO, (iii) +0.19 ± 0.46 ppbv for HCOOH, and (iv) −1.1 ± 0.39 ppbv for CH3OH. These values mostly agree with previously estimated retrieval errors; however, the relatively large negative bias in CH3OH and the significantly greater positive bias for larger HCOOH and CO values observed during this study warrant further investigation. Satellite and aircraft ammonia observations during the field campaign are also used in an initial effort to perform preliminary evaluations of Environment Canada's Global Environmental Multi-scale – Modelling Air quality and CHemistry (GEM-MACH) air quality modelling system at high resolution (2.5 × 2.5 km2). These initial results indicate a model underprediction of ~ 0.6 ppbv (~ 60 %) for NH3, during the field campaign period. The TES/model CO comparison differences are ~ +20 ppbv (~ +20 %), but given that under these conditions the TES/aircraft comparisons also show a small positive TES CO bias indicates that the overall model underprediction of CO is closer to ~ 10 % at 681 hPa (~ 3 km) during this period.

Citation: Shephard, M. W., McLinden, C. A., Cady-Pereira, K. E., Luo, M., Moussa, S. G., Leithead, A., Liggio, J., Staebler, R. M., Akingunola, A., Makar, P., Lehr, P., Zhang, J., Henze, D. K., Millet, D. B., Bash, J. O., Zhu, L., Wells, K. C., Capps, S. L., Chaliyakunnel, S., Gordon, M., Hayden, K., Brook, J. R., Wolde, M., and Li, S.-M.: Tropospheric Emission Spectrometer (TES) satellite observations of ammonia, methanol, formic acid, and carbon monoxide over the Canadian oil sands: validation and model evaluation, Atmos. Meas. Tech., 8, 5189-5211, doi:10.5194/amt-8-5189-2015, 2015.
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This study provides direct validations of Tropospheric Emission Spectrometer (TES) satellite retrieved profiles against coincident aircraft profiles of carbon monoxide, ammonia, methanol, and formic acid, all of which are of interest for air quality. The comparisons are performed over the Canadian oil sands region during an intensive field campaign in support of the Joint Canada-Alberta Implementation Plan for the Oil Sands Monitoring (JOSM). Initial model evaluations are also provided.
This study provides direct validations of Tropospheric Emission Spectrometer (TES) satellite...
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