Environmental Snapshots From ACE-Asia
Author
Kahn, Ralph
Anderson, Jim
Anderson, Theodore L.
Bates, Tim
Brechtel, Fred
Carrico, Christian M.
Clarke, Anthony
Doherty, Sarah J.
Dutton, Ellsworth
Flagan, Richard
Frouin, Robert
Fukushima, Hajime
Holben, Brent
Howell, Steve
Huebert, Barry
Jefferson, Anne
Jonsson, Haflidi
Kalashnikova, Olga
Kim, Jiyoung
Kim, Sang-Woo
Kus, Pinar
Li, Wen-Hao
Livingston, John M.
McNaughton, Cameron
Merrill, John
Mukai, Sonoyo
Murayama, Toshiyuki
Nakajima, Teruyuki
Quinn, Patricia
Redemann, Jens
Rood, Mark
Russell, Phil
Sano, Itaru
Schmid, Beat
Seinfeld, John
Sugimoto, Nobuo
Wang, Jian
Welton, Ellsworth J.
Won, Jae-Gwang
Yoon, Soon-Chang
Date
2004Metadata
Show full item recordAbstract
On five occasions spanning the Asian Pacific Regional Aerosol Characterization
Experiment (ACE-Asia) field campaign in spring 2001, the Multiangle Imaging
Spectroradiometer spaceborne instrument took data coincident with high-quality
observations by instruments on two or more surface and airborne platforms. The cases
capture a range of clean, polluted, and dusty aerosol conditions. With a three-stage
optical modeling process, we synthesize the data from over 40 field instruments into
layer-by-layer environmental snapshots that summarize what we know about the
atmospheric and surface states at key locations during each event. We compare related
measurements and discuss the implications of apparent discrepancies, at a level of detail
appropriate for satellite retrieval algorithm and aerosol transport model validation.
Aerosols within a few kilometers of the surface were composed primarily of pollution
and Asian dust mixtures, as expected. Medium- and coarse-mode particle size
distributions varied little among the events studied; however, column aerosol optical
depth changed by more than a factor of 4, and the near-surface proportion of dust
ranged between 25% and 50%. The amount of absorbing material in the submicron
fraction was highest when near-surface winds crossed Beijing and the Korean Peninsula
and was considerably lower for all other cases. Having simultaneous single-scattering
albedo measurements at more than one wavelength would significantly reduce the remaining optical model uncertainties. The consistency of component particle
microphysical properties among the five events, even in this relatively complex aerosol
environment, suggests that global, satellite-derived maps of aerosol optical depth and
aerosol mixture (air-mass-type) extent, combined with targeted in situ component
microphysical property measurements, can provide a detailed global picture of aerosol
behavior.
Description
Journal of Geophysical Research, Vol. 109, D19S14
The article of record as published may be found at http://dx.doi.org/10.1029/2003JD004339
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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