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Atmospheric Composition

We propose: (a) field deployment of our ground-based multi-function sky-viewing/direct-Sun-viewing differential optical absorption (MFDOAS) instrument which has been used successfully in the field to make measurements of tropospheric and stratospheric ozone, nitrogen dioxide, sulfur dioxide and formaldehyde, and (b) extensive analysis of the synergies to be gained from coincident analysis of direct Sun and scattered sky (MAX-DOAS) observations. The purpose of the deployments is to study the chemistry of regional air quality and to validate tropospheric and stratospheric data products from Aura/OMI. The purpose of the synergetic analysis is to make use of the simple interpretation of direct Sun measurements which provide total trace gas vertical column abundance to validate the complicated analyses of scattered sky data to derive accurate tropospheric vertical column abundances. The MFDOAS instrument spectroscopically measures trace gas abundances using direct Sunlight or scattered skylight at various viewing angles chosen to provide maximum tropospheric trace gas information, while retaining the capability to measure the zenith sky spectroscopic absorption using the “traditional” DOAS technique to obtain total vertical gas columns under clean conditions. The instrument makes important contributions to time-dependent mapping of tropospheric air pollutants to determine the effects of regional air pollution on the global atmosphere and address problems of regional air quality in time/spatial coincidence with Aura/OMI observations. This proposal requests funding for: field deployment at various urban and clean sites for measurement of nitrogen dioxide, ozone, formaldehyde, and sulfur dioxide to contribute to an understanding of tropospheric and stratospheric air chemistry, development of the full potential synergies between direct Sun and scattered sky measurements to better understand the difficult air mass factor calculations required to properly analyze scattered sky data, especially under conditions of aerosol loading, and validation of Aura data products by comparing the WSU MFDOAS data from the deployments with OMI satellite data.

Project PI: George Mount/Washington State University

405 Spokane Street, Sloan 101, PO Box 642910, Washington State University, Pullman WA 99164-2910

Phone: (509) 335-3790

Fax: (509) 335-7632

Email: gmount@wsu.edu

http://www.ce.wsu.edu/Faculty_Staff/Profiles/mount.htm

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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