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Comparison of methods for deriving aerosol asymmetry parameter

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. Wiley. 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.

Item URL in elib:https://elib.dlr.de/21697/
Document Type:Article
Title:Comparison of methods for deriving aerosol asymmetry parameter
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Andrews, ElisabethUniv. of Colorado, Boulder, CO, USAUNSPECIFIED
Sheridan, Patrick J.NOAA, Boulder, CO, USAUNSPECIFIED
McComiskey, AllisonUniv. of Colorado, Boulder, CO, USAUNSPECIFIED
Arnott, PatDesert Research Inst., Reno, NV, USAUNSPECIFIED
Covert, D.Univ. of Washington, Seattle, WA, USAUNSPECIFIED
Elleman, R.Univ. of Washington, Seattle, WA, USAUNSPECIFIED
Gasparini, R.Texas A&M Univ., TX, USAUNSPECIFIED
Collins, D.Texas A&M Univ., TX, USAUNSPECIFIED
Jonsson, H.Naval Postgraduate School, Marina, CA, USAUNSPECIFIED
Schmid, B.Bay Area Environmental Research Inst., Sonoma, CA, USAUNSPECIFIED
Wang, J.Brookhaven National Lab., Upton, NY, USAUNSPECIFIED
Date:21 January 2006
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1029/2004JD005734
Page Range:D05S04
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)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Fiebig, Dr.rer.nat. Markus
Deposited On:13 Jul 2007
Last Modified:08 Mar 2018 18:43

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