Sensitivity of aerosol to assumed optical properties over Asia using a global aerosol model and AERONET

D. Goto, N. A.J. Schutgens, T. Nakajima, T. Takemura

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Key variables required for aerosol direct radiative forcing estimates are aerosol optical thickness (AOT), ngstrm Exponent (AE) and single scattering albedo (SSA), which are determined not only by aerosol amount but also by physical and optical parameters such as size distribution, hygroscopicity, mixing state of the particles, and refractive index especially of absorbing particles such as black carbon (BC) and dust. As the values of these parameters are often assumed in climate models, we investigate how the variations in these prescribed parameters can explain the differences in AOT, AE and SSA between the simulation by an aerosol global model and the ground-based remote sensing observation, AERONET. We conclude that the differences between our simulations and AERONET observations of AOT, AE and SSA are larger than sampling errors but can be generally explained by the uncertainty of the assumed parameters, although some simulations have clear biases that may be caused by errors in both emission and transport by the model. The uncertainty of sulfate sizes significantly dominates the uncertainty of AOT, AE and SSA, whereas the uncertainty of dust refractive indices and mixing states of organic carbon and BC is dominates the uncertainty of SSA.

    Original languageEnglish
    Article numberL17810
    JournalGeophysical Research Letters
    Volume38
    Issue number17
    DOIs
    Publication statusPublished - Sep 1 2011

    Fingerprint

    optical property
    aerosols
    albedo
    aerosol
    optical properties
    sensitivity
    optical thickness
    scattering
    exponents
    refractive index
    black carbon
    carbon
    dust
    hygroscopicity
    refractivity
    simulation
    radiative forcing
    climate models
    Asia
    AERONET

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)

    Cite this

    Sensitivity of aerosol to assumed optical properties over Asia using a global aerosol model and AERONET. / Goto, D.; Schutgens, N. A.J.; Nakajima, T.; Takemura, T.

    In: Geophysical Research Letters, Vol. 38, No. 17, L17810, 01.09.2011.

    Research output: Contribution to journalArticle

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    AB - Key variables required for aerosol direct radiative forcing estimates are aerosol optical thickness (AOT), ngstrm Exponent (AE) and single scattering albedo (SSA), which are determined not only by aerosol amount but also by physical and optical parameters such as size distribution, hygroscopicity, mixing state of the particles, and refractive index especially of absorbing particles such as black carbon (BC) and dust. As the values of these parameters are often assumed in climate models, we investigate how the variations in these prescribed parameters can explain the differences in AOT, AE and SSA between the simulation by an aerosol global model and the ground-based remote sensing observation, AERONET. We conclude that the differences between our simulations and AERONET observations of AOT, AE and SSA are larger than sampling errors but can be generally explained by the uncertainty of the assumed parameters, although some simulations have clear biases that may be caused by errors in both emission and transport by the model. The uncertainty of sulfate sizes significantly dominates the uncertainty of AOT, AE and SSA, whereas the uncertainty of dust refractive indices and mixing states of organic carbon and BC is dominates the uncertainty of SSA.

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