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    Direct Aerosol Radiative Forcing Uncertainty Based on a Radiative Perturbation Analysis

    Source: Journal of Climate:;2010:;volume( 023 ):;issue: 019::page 5288
    Author:
    Loeb, Norman G.
    ,
    Su, Wenying
    DOI: 10.1175/2010JCLI3543.1
    Publisher: American Meteorological Society
    Abstract: To provide a lower bound for the uncertainty in measurement-based clear- and all-sky direct aerosol radiative forcing (DARF), a radiative perturbation analysis is performed for the ideal case in which the perturbations in global mean aerosol properties are given by published values of systematic uncertainty in Aerosol Robotic Network (AERONET) aerosol measurements. DARF calculations for base-state climatological cloud and aerosol properties over ocean and land are performed, and then repeated after perturbing individual aerosol optical properties (aerosol optical depth, single-scattering albedo, asymmetry parameter, scale height, and anthropogenic fraction) from their base values, keeping all other parameters fixed. The total DARF uncertainty from all aerosol parameters combined is 0.5?1.0 W m?2, a factor of 2?4 greater than the value cited in the Intergovernmental Panel on Climate Change?s (IPCC?s) Fourth Assessment Report. Most of the total DARF uncertainty in this analysis is associated with single-scattering albedo uncertainty. Owing to the greater sensitivity to single-scattering albedo in cloudy columns, DARF uncertainty in all-sky conditions is greater than in clear-sky conditions, even though the global mean clear-sky DARF is more than twice as large as the all-sky DARF.
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      Direct Aerosol Radiative Forcing Uncertainty Based on a Radiative Perturbation Analysis

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    contributor authorLoeb, Norman G.
    contributor authorSu, Wenying
    date accessioned2017-06-09T16:35:31Z
    date available2017-06-09T16:35:31Z
    date copyright2010/10/01
    date issued2010
    identifier issn0894-8755
    identifier otherams-70562.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212357
    description abstractTo provide a lower bound for the uncertainty in measurement-based clear- and all-sky direct aerosol radiative forcing (DARF), a radiative perturbation analysis is performed for the ideal case in which the perturbations in global mean aerosol properties are given by published values of systematic uncertainty in Aerosol Robotic Network (AERONET) aerosol measurements. DARF calculations for base-state climatological cloud and aerosol properties over ocean and land are performed, and then repeated after perturbing individual aerosol optical properties (aerosol optical depth, single-scattering albedo, asymmetry parameter, scale height, and anthropogenic fraction) from their base values, keeping all other parameters fixed. The total DARF uncertainty from all aerosol parameters combined is 0.5?1.0 W m?2, a factor of 2?4 greater than the value cited in the Intergovernmental Panel on Climate Change?s (IPCC?s) Fourth Assessment Report. Most of the total DARF uncertainty in this analysis is associated with single-scattering albedo uncertainty. Owing to the greater sensitivity to single-scattering albedo in cloudy columns, DARF uncertainty in all-sky conditions is greater than in clear-sky conditions, even though the global mean clear-sky DARF is more than twice as large as the all-sky DARF.
    publisherAmerican Meteorological Society
    titleDirect Aerosol Radiative Forcing Uncertainty Based on a Radiative Perturbation Analysis
    typeJournal Paper
    journal volume23
    journal issue19
    journal titleJournal of Climate
    identifier doi10.1175/2010JCLI3543.1
    journal fristpage5288
    journal lastpage5293
    treeJournal of Climate:;2010:;volume( 023 ):;issue: 019
    contenttypeFulltext
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