First satellite observations of lower tropospheric ammonia and methanol

Details First satellite observations of lower tropospheric ammonia and methanol First satellite observations of lower tropospheric ammonia and methanol

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3509801b&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 9, CiteID L09801

Physics

16

Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610)

Scientific paper

The Tropospheric Emission Spectrometer (TES) on the EOS Aura satellite makes global measurements of infrared radiances which are used to derive profiles of species such as O3, CO, H2O, HDO and CH4 as routine standard products. In addition, TES has a variety of special modes that provide denser spatial mapping over a limited geographical area. A continuous-coverage mode (called ``transect'', about 460 km long) has now been used to detect additional molecules indicative of regional air pollution. On 10 July 2007 at about 05:37 UTC (13:24 LMST) TES conducted such a transect observation over the Beijing area in northeast China. Examination of the residual spectral radiances following the retrieval of the TES standard products revealed surprisingly strong features attributable to enhanced concentrations of ammonia (NH3) and methanol (CH3OH), well above the normal background levels. This is the first time that these molecules have been detected in space-based nadir viewing measurements that penetrate into the lower atmosphere.

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