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Retrieval and climatology of the aerosol asymmetry parameter in the NOAA aerosol monitoring network

Fiebig, Markus and Ogren, John A. (2006) Retrieval and climatology of the aerosol asymmetry parameter in the NOAA aerosol monitoring network. Journal of Geophysical Research, 111, D21204. DOI: 10.1029/2005JD006545.

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Official URL: http://www.agu.org/journals/jd/jd0621/2005JD006545/


The aerosol monitoring network of the NOAA Earth System Research Laboratory routinely provides data on the aerosol absorption and spectral scattering and backscattering coefficients. An algorithm is introduced that retrieves from the primary measurements the aerosol asymmetry parameter, the optical property needed in addition to those mentioned above to completely characterize aerosol with respect to its direct radiative effect on climate. The algorithm is tested on synthetic data and shown to retrieve the spectral aerosol asymmetry parameter for aerodynamic particle diameters D<sub>p,aer</sub> ‹ 1.0 μm with ∼0.8% systematic uncertainty and ∼1.1% systematic uncertainty for D<sub>p,aer</sub> ‹ 10.0 μm. The algorithm is applied to data from six ESRL stations representing aerosol in the dried state of continental, marine, arctic, and free tropospheric origin. The retrieved asymmetry parameters show a significant dependence on wavelength. Both wavelength dependence and absolute value of the asymmetry parameter depend on location or air mass type. The median values range from 0.57 for free tropospheric aerosol to 0.65 for marine aerosol at 550 nm wavelength and D<sub>p,aer</sub> ‹ 10.0 μm. It is shown that the accuracy of the asymmetry parameters retrieved with the algorithm is significantly larger than that of asymmetry parameters derived from backscatter fractions assuming a Henyey-Greenstein phase function.

Document Type:Article
Title:Retrieval and climatology of the aerosol asymmetry parameter in the NOAA aerosol monitoring network
AuthorsInstitution or Email of Authors
Ogren, John A.NOAA, Boulder, CO, USA
Date:8 November 2006
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:D21204
Keywords:aerosol optical properties, retrieval of aerosol properties, aerosol asymmetry parameter
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: Dr.rer.nat. Markus Fiebig
Deposited On:08 Feb 2007
Last Modified:11 Nov 2014 21:56

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