HR: 0800h
AN: A41A-0020    [Abstracts]
TI: Tropospheric sources of NO2 seen (and unseen) by OMI
AU: * Celarier, E A
EM: celarier@jwocky.gsfc.nassa.gov
AF: SGT, Inc, 7701 Greenbelt Rd Ste 400, Greenbelt, MD 20770 United States
AU: Bucsela, E J
EM: bucsela@redwind.gsfc.nasa.gov
AF: GEST/UMBC, 5523 Research Park Drive, Suite 320, Baltimore, MD 21228 United States
AU: Wenig, M
EM: wenig@hyperion.gsfc.nasa.gov
AF: NRC, c/o NASA Goddard Space Flight Center Code 613.3, Greenbelt, MD 20771 United States
AU: Duncan, B N
EM: duncan@code916.gsfc.nasa.gov
AF: GEST/UMBC, 5523 Research Park Drive, Suite 320, Baltimore, MD 21228 United States
AU: Gleason, J F
EM: gleason@redwind.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 613.3, Greenbelt, MD 20771 United States
AU: Veefkind, J P
EM: veefkind@knmi.nl
AF: Royal Dutch Meteorological Institute, Postbus 201, AE De Bilt, 3730 Netherlands
AU: Brinksma, E
EM: ellen.brinksma@knmi.nl
AF: Royal Dutch Meteorological Institute, Postbus 201, AE De Bilt, 3730 Netherlands
AU: Boersma, F
EM: folkert.boersma@knmi.nl
AF: Royal Dutch Meteorological Institute, Postbus 201, AE De Bilt, 3730 Netherlands
AB: The Ozone Monitoring Instrument (OMI), aboard the EOS-AURA satellite provides measurements with high spectral (~0.5 nm) and spatial (~26 km, at nadir) resolutions. The spatial resolution is on the order of the typical size of urban centers. The NO₂ retrieval algorithm is the result of a joint effort between NASA Goddard Space Flight Center, the Royal Dutch Meteorological Institute (KNMI) and Space Sciences Finland (SSF). The algorithm detects tropospheric NO₂ enhancements, and corrects them using an air mass factor (AMF) appropriate to that situation. Significant NO₂ enhancements are largely antropogenic; natural sources, such as lightning, generally produce much lower concentrations. Databases of NO₂ source inventories have been available, and are the basis of chemical transport modeling of NO₂ concentrations. In this presentation, we examine daily global NO₂ vertical column density fields retrieved from OMI over its first year of operations, and identify both persistent and episodic elevated NO₂ events, and compare them to the inventory databases. Preliminary examination of small sets of data suggested that, while most of the expected source regions are seen in the data, plumes from expected sources are either not seen, or seen at much lower levels than expected, while some prominent persistent sources are seen in the data, which are not in the source databases. Episodic events should be associated with known events, such as biomass burning.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005