`Comparison of methods for deriving aerosol asymmetry parameter

被引:187
作者
Andrews, E [1 ]
Sheridan, PJ
Fiebig, M
McComiskey, A
Ogren, JA
Arnott, P
Covert, D
Elleman, R
Gasparini, R
Collins, D
Jonsson, H
Schmid, B
Wang, J
机构
[1] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80305 USA
[2] Desert Res Inst, Reno, NV 89512 USA
[3] Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA
[4] Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA
[5] Deutsch Zentrum Luft & Raumfahrt, Inst Phys Atmosphare, D-82234 Wessling, Germany
[6] Source Environm Sci Inc, Houston, TX 77027 USA
[7] USN, Postgrad Sch, Ctr Interdisciplinary Remotely Piloted Aircraft S, Marina, CA 93933 USA
[8] NOAA, Global Monitoring Div, Earth Syst Res Lab, Boulder, CO 80309 USA
[9] Bay Area Environm Res Inst, Sonoma, CA 95476 USA
[10] Brookhaven Natl Lab, Upton, NY 11973 USA
关键词
D O I
10.1029/2004JD005734
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Values for Mie-equivalent aerosol asymmetry parameter (g) were derived using a variety of methods from the large suite of measurements (in situ and remote from surface and aircraft) made in Oklahoma during the 2003 aerosol Intensive Operations Period (IOP). Median values derived for dry asymmetry parameter at 550 nm ranged between 0.55 and 0.63 over all instruments and for all derivation methods, with the exception of one instrument which did not measure over the full size range of optically important aerosol. Median values for the "wet" asymmetry parameter (i.e., asymmetry parameter at humidity conditions closer to ambient) were between 0.59 and 0.72. Values for g derived for surface and airborne in situ measurements were highly correlated, but in situ and remote sensing measurements both at the surface and aloft did not agree as well because of vertical inhomogeneity of the aerosol. Radiative forcing calculations suggest that a 10% decrease in g would result in a 19% reduction in top of atmosphere radiative forcing for the conditions observed during the IOP. Comparison of the different methods for deriving g suggests that in computing the asymmetry parameter, aerosol size is the most important parameter to measure; composition is less important except for how it influences the hygroscopic growth (i.e., size) of particles.
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