Andrews, Elisabeth and Sheridan, Patrick J. and Fiebig, Markus and McComiskey, Allison and Ogren, John A. and Arnott, Pat and Covert, D. and Elleman, R. and Gasparini, R. and Collins, D. and Jonsson, H. and Schmid, B. and Wang, J. (2006) Comparison of methods for deriving aerosol asymmetry parameter. Journal of Geophysical Research, 111, D05S04. DOI: 10.1029/2004JD005734.
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Official URL: http://dx.doi.org/10.1029/2004JD005734
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.
|Title:||Comparison of methods for deriving aerosol asymmetry parameter|
|Date:||21 January 2006|
|Journal or Publication Title:||Journal of Geophysical Research|
|In ISI Web of Science:||Yes|
|Keywords:||aerosol asymmetry parameter, atmospheric aerosol, aerosol climate effect|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Vorhaben Atmosphären- und Klimaforschung (old)|
|Institutes and Institutions:||Institute of Atmospheric Physics > Atmospheric Trace Species|
|Deposited By:||Dr.rer.nat. Markus Fiebig|
|Deposited On:||13 Jul 2007|
|Last Modified:||27 Apr 2009 04:56|
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