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Overview of ACE-Asia Spring 2001 Investigations On Aerosol-Radiation InteractionsACE-Asia's extensive measurements from land, ocean, air and space quantified aerosol-radiation interactions. Results from each platform type, plus satellite-suborbital combinations, include: 1. Time series of multiwavelength aerosol optical depth (ADD), Angstrom exponent (alpha), single-scattering albedo (SSA), and size distribution from AERONET radiometry at 13 stations. In China and Korea AOD and alpha were strongly anticorrelated (reflecting transient dust events); dust volume-size modes peaked near 8 microns diameter; and SSA(dust) greater than SSA(pollution). 2. Calculations and measurements of photosynthetically active radiation and aerosols in China yield 24-h average downward surface radiative forcing per AOD(500 nm) of -27 W/sq m (400-700 nm). 3. The Hawaii-Japan cruise sampled a gradient with AOD(500 nm) extremes of 0.1 and 1.1. Shipboard measurements showed that adding dust to pollution increased SSA(550 nm, 55% RH), typically from -0.91 to approx. 0.97. Downwelling 8-12 micron radiances showed aerosol effects, especially in the major April dust event, with longwave forcing estimated at -5 to 15 W/sq m. 4. Extinction profiles from airborne sunphotometry and total-direct-diffuse radiometry show wavelength dependence often varying strongly with height, reflecting layering of dust-dominated over pollution-dominated aerosols. Comparing sunphotometric extinction profiles to those from in situ measurements (number and composition vs size, or scattering and absorption) shows layer heights agree, but extinction sometimes differs. 5. Airborne solar spectral flux radiometry yields absorption spectra for layers. Combining with AOD spectra yields best-fit aerosol single scattering albedo spectra. 6. Visible, NIR and total solar fluxes combined with AOD give radiative forcing efficiencies at surface and aloft.
Document ID
20020064465
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Russell, P. B.
(NASA Ames Research Center Moffett Field, CA United States)
Flatau, P. J.
(California Univ. San Diego, CA United States)
Valero, F. P. J.
(California Univ. San Diego, CA United States)
Nakajima, T.
(Tokyo Univ. Japan)
Holben, B.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Pilewskie, P.
(NASA Ames Research Center Moffett Field, CA United States)
Bergin, M.
(Georgia Inst. of Tech. Atlanta, GA United States)
Schmid, B.
(Bay Area Environmental Research Inst. Sonoma , CA United States)
Bergstrom, R. W.
(Bay Area Environmental Research Inst. Sonoma , CA United States)
Vogelmann, A.
(California Univ. San Diego, CA United States)
Hipskind, R. Stephen
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Environment Pollution
Meeting Information
Meeting: IGAC/CACGP Atmospheric Chemistry Conference
Location: Crete
Country: Greece
Start Date: September 18, 2002
End Date: September 25, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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