Environmental snapshots from ACE-Asia

摘要: On five occasions spanning the Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia) field campaign in spring 2001, 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, dusty aerosol conditions. With three-stage optical modeling process, we synthesize from over 40 into layer-by-layer environmental snapshots that summarize what know about atmospheric states at key locations during each event. We compare related measurements discuss implications apparent discrepancies, level detail appropriate for satellite retrieval algorithm transport model validation. Aerosols within few kilometers were composed primarily pollution dust mixtures, as expected. Medium- coarse-mode particle size distributions varied little among events studied; however, column depth changed than factor 4, near-surface proportion ranged between 25% 50%. amount absorbing material submicron fraction was highest when winds crossed Beijing Korean Peninsula considerably lower all other cases. Having simultaneous single-scattering albedo one wavelength would significantly reduce remaining uncertainties. consistency component microphysical properties events, even this relatively complex environment, suggests global, satellite-derived maps mixture (air-mass-type) extent, combined targeted situ property measurements, can provide detailed global picture behavior.