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Validation of SO2 Retrievals from the Ozone Monitoring Instrument over NE ChinaThe Dutch-Finnish Ozone Monitoring Instrument (OMI) launched on the NASA Aura satellite in July 2004 offers unprecedented spatial resolution, coupled with contiguous daily global coverage, for space-based UV measurements of sulfur dioxide (SO2). We present a first validation of the OMI SO2 data with in situ aircraft measurements in NE China in April 2005. The study demonstrates that OMI can distinguish between background SO2 conditions and heavy pollution on a daily basis. The noise (expressed as the standard deviation,sigma) is approximately 1.5 DU (Dobson units; 1 DU = 2.69 10 (exp 16) molecules/cm (exp 2)) for instantaneous field of view boundary layer (PBL) SO2 data. Temporal and spatial averaging can reduce the noise to sigma approximetly 0.3 DU over a remote region of the South Pacific; the long-term average over this remote location was within 0.1 DU of zero. Under polluted conditions collection 2 OMI data are higher than aircraft measurements by a factor of two. Improved calibrations of the radiance and irradiance data (collection 3) result in better agreement with aircraft measurements on polluted days. The air mass corrected collection 3 data still show positive bias and sensitivity to UV absorbing aerosols. The difference between the in situ data and the OMI SO2 measurements within 30 km of the aircraft profiles was about 1 DU, equivalent to approximately 5 ppb from 0 to 3000 m altitude. Quantifying the SO2 and aerosol profiles and spectral dependence of aerosol absorption between 310 and 330 nm are critical for an accurate estimate of SO2 from satellite UV measurements.
Document ID
20090035794
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Krotkov, Nickolay A.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
McClure, Brittany
(Maryland Univ. College Park, MD, United States)
Dickerson, Russell R.
(Maryland Univ. College Park, MD, United States)
Carn, Simon A.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Li, Can
(Maryland Univ. College Park, MD, United States)
Bhartia, Pawan K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Yang, Kai
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Krueger, Arlin J.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Li, Zhanqing
(Maryland Univ. College Park, MD, United States)
Levelt, Pieternel F.
(Royal Netherlands Meteorological Inst. De Bilt, Netherlands)
Chen, Hongbin
(Academia Sinica Beijing, China)
Wang, Pucai
(Academia Sinica Beijing, China)
Lu, Daren
(Academia Sinica Beijing, China)
Date Acquired
August 24, 2013
Publication Date
June 1, 2008
Publication Information
Publication: Journal of Geophysical Research - Atmospheres
Publisher: American Geophysical Union
Volume: 113
ISSN: 0148-0227
Subject Category
Environment Pollution
Distribution Limits
Public
Copyright
Other

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