HR: 0800h
AN: A41B-0043 [Abstracts]
TI: Total Vertical Column Nitrogen Dioxide Derived From OMI/Aura Versus Ground-Based Measurements at
Goddard Space Flight Center
AU: Herman, J R
EM: jay.r.herman@nasa.gov
AF: Goddard Space Flight Center, Code 613.3, Greenbelt, MD 20771
United States
AU: Bucsela, E
EM: bussela@carioca.gsfc.nasa.gov
AF: University of MD GEST, 5523 Research Park Drive, Suite 320, Baltimore, MD 21228
United States
AU: Celarier, E
EM: celarier@carioca.gsfc.nasa.gov
AF: SGT Corporation, 7701 Greenbelt Road Suite 400, Greenbelt, MD 20770
United States
AU: * Cede, A
EM: cede@carioca.gsfc.nasa.gov
AF: SSAI, 10210 Greenbelt Road, Suite 600, Lanham, MD 20706
United States
AU: Gleason, J
EM: James.F.Gleason@nasa.gov
AF: Goddard Space Flight Center, Code 613.3, Greenbelt, MD 20771
United States
AB:
We compared one year of total vertical column nitrogen dioxide (NO2) data derived from the Ozone Monitoring Instrument
(OMI) with ground-based measurements taken at the Goddard Space Flight Center, near Washington DC, USA. Ground-data were
obtained approximately every 20 minutes from direct-sun measurements using a Brewer spectrometer. A "bootstrap" method was
used to calibrate the instrument using the cleanest days from a 2-year database of daily direct-sun measurements to obtain
the reference spectrum. Satellite-data were derived from OMI's near-nadir observations using a Differential Optical
Absorption Spectroscopy algorithm. The retrieved OMI slant columns were converted into vertical columns using a geometric air
mass factor (AMF). For the comparison cloud screening was applied to both ground- and satellite-data. The spatial
resolution of OMI has a pixel size of about 24x13km2, which is better than that of other satellite instruments, and
therefore, the monitoring of atmospheric trace gases is improved significantly in urban polluted areas with high spatial
variability of NO2. Since the AMF of the direct-sun ground-measurements is independent of the atmospheric composition
and structure (for example surface albedo, cloud fraction and height, vertical NO2 profile), the results of the
comparison permit us to study the temporal variation of the AMF.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0365 Troposphere: composition and chemistry
DE: 0520 Data analysis: algorithms and implementation
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005