Satellite observations of Mexico City pollution outflow from the Tropospheric Emissions Spectrometer (TES) |
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| Authors: | Changsub Shim Qinbin Li Ming Luo Susan Kulawik Helen Worden John Worden Annmarie Eldering Glenn Diskin Glen Sachse Andy Weinheimer David Knapp Deedee Montzca Teresa Campos |
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| Institution: | 1. Portland Community College, 12000 SW 49th Ave, Portland, OR 97219, USA;2. Saratov State University, 83 Astrakhanskay Street, Saratov 410012, Russian Federation;1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;3. Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;4. Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei 230026, China;5. Institute of Environmental Sciences and Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan |
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| Abstract: | Concurrent tropospheric O3 and CO vertical profiles from the Tropospheric Emission Spectrometer (TES) during the MILAGRO/INTEX-B aircraft campaigns over the Mexico City Metropolitan Area (MCMA) and its surrounding regions were used to examine Mexico City pollution outflow on a regional scale. The pollution outflow from the MCMA occurred predominantly at 600–800 hPa as evident in O3, CO, and NOx enhancements in the in situ aircraft observations. TES O3 and CO are sensitive to the MCMA pollution outflow due to their relatively high sensitivities at 600–800 hPa. We examined O3, CO, and their correlation at 600–800 hPa from TES retrievals, aircraft measurements, and GEOS-Chem model results. TES captures much of the spatial and day-to-day variability of O3 seen in the in situ data. TES CO, however, shows much less spatial and day-to-day variability compared with the in situ observations. The ΔO3/ΔCO slope is significantly higher in the TES data (0.43) than the in situ data (0.28) due partly to the lack of variability in TES CO. Extraordinarily high ΔO3/ΔCO slope (0.81) from TES observations at 618 hPa over the Eastern U.S. was previously reported by Zhang et al. Zhang, L., Jacob, D.J., Bowman, K.W., et al., 2006. Ozone–CO correlations determined by the TES satellite instrument in continental outflow regions. Geophys. Res. Lett. 33, L18804. 10.1029/2006GL026399.]. Thus the application of TES CO–O3 correlation to map continental pollution outflow needs further examination. |
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