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Airborne Sun photometry and Closure Studies in SAFARI-2000 Dry Season CampaignFrom August 13 to September 25, the Southern African Regional Science Initiative's (SAFARI 2000) dry-season airborne campaign studied the complex interactions between the region's ecosystems, air pollution, atmospheric circulation, land-atmosphere interactions, and land use change. The field campaign was timed to coincide with the annual winter fire season in Southern Africa. This challenging campaign. which coordinated ground-based measurement teams, multiple research aircraft, and satellite overpasses across nine African nations, was head quartered at the Petersburg International Airport in South Africa's Northern Province. Among many others, unique coordinated observations were made of the evolution of massive, thick haze layers produced by industrial emissions, biomass burning, marine and biogenic sources. The NASA Ames Airborne Tracking 14-channel Sunphotometer (AATS-14) was operated successfully aboard the University of Washington CV-580 during 24 data flights. The AATS-14 instrument measures the transmission of the direct solar beam at 14 discrete wavelengths (3501558 nm) from which we derive spectral aerosol optical depths (AOD), columnar water vapor (CWV) and columnar ozone. Flying at different altitudes over a fixed location allows derivation of layer AOD and CWV. Data taken during feasible vertical profiles allows derivation of aerosol extinction and water vapor density. In the talk, we show comparisons with ground-based AERONET sun/sky photometer results, with ground based MPL-Net lidar data, and with measurements from a lidar aboard the high flying ER-2 aircraft. We will use measurements from the Ames Solar Spectral Flux Radiometer to derive estimates of solar spectral forcing as a function of aerosol thickness. Validations of TOMS and Terra satellite aerosol and water-vapor retrievals will also be discussed.
Document ID
20010056689
Document Type
Preprint (Draft being sent to journal)
Authors
Schmid, B. (Bay Area Environmental Research Inst. San Francisco, CA United States)
Russell, P. B. (NASA Ames Research Center Moffett Field, CA United States)
Pilewskie, P. (NASA Ames Research Center Moffett Field, CA United States)
Redemann, J. (Bay Area Environmental Research Inst. San Francisco, CA United States)
Livingston, J. M. (SRI International Corp. Menlo Park, CA United States)
Hobbs, P. V. (Washington Univ. Seattle, WA United States)
Welton, E. J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Campbell, J. (Science Systems and Applications, Inc. Greenbelt, MD United States)
Holben, B. N. (NASA Goddard Space Flight Center Greenbelt, MD United States)
McGill, M. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Hipskind, R. Stephen
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Meteorology and Climatology
Meeting Information
IAMAS(Innsbruck)
Funding Number(s)
PROJECT: RTOP 621-14-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.