HR: 0800h
AN: A51D-0736    [Abstracts]
TI: Evaluation of OMI Column Retrievals of HCHO, BrO and OClO Using Ground-Based DOAS and FTS Measurements, SCIAMACHY and GOME Satellite Observations, and GEOS-Chem Modeling
AU: * Kurosu, T P
EM: tkurosu@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street (MS 50), Cambridge, MA 02138, United States
AU: Chance, K
EM: kchance@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street (MS 50), Cambridge, MA 02138, United States
AU: Palmer, P I
EM: pip@env.leeds.ac.uk
AF: University of Edinburgh, School of GeoSciences King's Buildings West Mains Road, Edinburgh, DH9 3JW, United Kingdom
AU: Richter, A
EM: Andreas.Richter@iup.physik.uni-bremen.de
AF: University of Bremen, Institute of Environmental Physics P.O. Box 33 04 40, Bremen, 28334, Germany
AU: De Smedt, I
EM: Isabelle.Desmedt@bira-iasb.be
AF: Belgian Institute for Space Aeronomy (IASB-BIRA), 3, Avenue Circulaire, Brussels, 1180, Belgium
AU: Van Roozendael, M
EM: michelv@oma.be
AF: Belgian Institute for Space Aeronomy (IASB-BIRA), 3, Avenue Circulaire, Brussels, 1180, Belgium
AU: Hendrick, F
EM: franch@oma.be
AF: Belgian Institute for Space Aeronomy (IASB-BIRA), 3, Avenue Circulaire, Brussels, 1180, Belgium
AU: Kuehl, S
EM: skuehl@mpch-mainz.mpg.de
AF: MPI for Chemistry, Joh.-Joachim-Becher-Weg 27, Mainz, 55128, Germany
AU: Wagner, T
EM: thomas.wagner@mpch-mainz.mpg.de
AF: MPI for Chemistry, Joh.-Joachim-Becher-Weg 27, Mainz, 55128, Germany
AU: Millet, D B
EM: millet@eps.harvard.edu
AF: Harvard University, Earth and Planetary Sciences Pierce Hall 29 Oxford Street, Cambridge, MA 02138, United States
AU: Jones, N
EM: njones@uow.edu.au
AF: University of Wollongong, School of Chemistry, Wollongong, NSW 2522, New Zealand
AU: Salawitch, R
EM: rjs@caesar.jpl.nasa.gov
AF: Jet Propulsion Laboratory, M/S 183-601 4800 Oak Grove Drive , Pasadena, CA 91109, United States
AU: Kreher, K
EM: k.kreher@niwa.co.nz
AF: NIWA/Lauder, Private Bag 50061, Omakau State Highway 85, Central Otago, Lauder, 50061, New Zealand
AB: We present comparisons of the operational column retrievals of OMI BrO, OClO, and HCHO from the Dutch- Finnish Ozone Monitoring Instrument (OMI) on EOS/Aura with space-based observations from SCIAMACHY (all molecules) and GOME (BrO and HCHO), ground-based MAX-DOAS and FTS observations of BrO and HCHO, and GEOS-Chem modeling results for HCHO. Current operational retrievals of BrO, OClO, and HCHO from OMI suffer from across-track "striped" spatial structures, arising predominantly from insufficient dark current corrections in the radiance and irradiance spectra. Driven by the need to avoid the most affected regions of the CCD detector, sub-optimum retrieval windows had to be chosen. In the case of HCHO and BrO this contributed to the current 35-40% underestimate in derived columns compared with correlative ground-based and satellite data, and to OClO columns that are a factor of two too high compared with SCIAMACHY columns. Recent improvements in the OMI radiances and irradiances, particularly the implementation of daily dark current updates, greatly reduce the across-track striping in the retrieved column amounts of all molecules considered here. We also show that better optimization of spectral fitting windows and the implementation of soft calibration in the retrieval algorithms greatly improves the BrO, OClO, and HCHO data products. These improvements lead to better agreement between columns from OMI and other instruments. We present daily and monthly comparisons between OMI and selected ground-based stations, global comparisons of BrO and HCHO of OMI, GOME and SCIAMACHY, and regional comparisons with results from the GEOS-Chem model.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting