Direct radiative effect of aerosols estimated using ensemble-based data assimilation in a global aerosol climate model

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    Abstract

    We developed a new ensemble-based data-assimilation system based on a global aerosol climate model and performed a 1-month assimilation experiment using satellite optical measurements from MODIS onboard TERRA and AQUA to estimate the direct radiative effect (DRE) of aerosols. Using the assimilated data field, monthly averaged optical thickness (AOT) was estimated to be 0.15 ± 0.030 (a 52.0% increase over a priori), and the root mean-square difference (RMSD) between modeled values and MODIS measurements was reduced by 28.4%. Independent validation using globally distributed AERONET measurements showed that the a posteriori data achieved better agreement with 82.5% of 80 AERONET sites. However, improvements in ngstrm exponents were limited (50.0% of sites). Using the assimilated aerosol field, we modeled the aerosol DRE. A posteriori whole-and clear-sky DREs at the top of the atmosphere were estimated to be-1.1 ± 0.35 and-2.5 ± 0.49 W/m2, respectively, in May 2007 and were close to previously reported measurement-based estimates.

    Original languageEnglish
    Article numberL21802
    JournalGeophysical Research Letters
    Volume38
    Issue number21
    DOIs
    Publication statusPublished - Nov 1 2011

    Fingerprint

    climate models
    assimilation
    data assimilation
    aerosols
    climate modeling
    aerosol
    MODIS (radiometry)
    MODIS
    clear sky
    estimates
    optical measurement
    optical thickness
    sky
    exponents
    atmospheres
    effect
    atmosphere
    experiment
    AERONET

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)

    Cite this

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    title = "Direct radiative effect of aerosols estimated using ensemble-based data assimilation in a global aerosol climate model",
    abstract = "We developed a new ensemble-based data-assimilation system based on a global aerosol climate model and performed a 1-month assimilation experiment using satellite optical measurements from MODIS onboard TERRA and AQUA to estimate the direct radiative effect (DRE) of aerosols. Using the assimilated data field, monthly averaged optical thickness (AOT) was estimated to be 0.15 ± 0.030 (a 52.0{\%} increase over a priori), and the root mean-square difference (RMSD) between modeled values and MODIS measurements was reduced by 28.4{\%}. Independent validation using globally distributed AERONET measurements showed that the a posteriori data achieved better agreement with 82.5{\%} of 80 AERONET sites. However, improvements in ngstrm exponents were limited (50.0{\%} of sites). Using the assimilated aerosol field, we modeled the aerosol DRE. A posteriori whole-and clear-sky DREs at the top of the atmosphere were estimated to be-1.1 ± 0.35 and-2.5 ± 0.49 W/m2, respectively, in May 2007 and were close to previously reported measurement-based estimates.",
    author = "K. Yumimoto and T. Takemura",
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    language = "English",
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    journal = "Geophysical Research Letters",
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    AU - Yumimoto, K.

    AU - Takemura, T.

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    N2 - We developed a new ensemble-based data-assimilation system based on a global aerosol climate model and performed a 1-month assimilation experiment using satellite optical measurements from MODIS onboard TERRA and AQUA to estimate the direct radiative effect (DRE) of aerosols. Using the assimilated data field, monthly averaged optical thickness (AOT) was estimated to be 0.15 ± 0.030 (a 52.0% increase over a priori), and the root mean-square difference (RMSD) between modeled values and MODIS measurements was reduced by 28.4%. Independent validation using globally distributed AERONET measurements showed that the a posteriori data achieved better agreement with 82.5% of 80 AERONET sites. However, improvements in ngstrm exponents were limited (50.0% of sites). Using the assimilated aerosol field, we modeled the aerosol DRE. A posteriori whole-and clear-sky DREs at the top of the atmosphere were estimated to be-1.1 ± 0.35 and-2.5 ± 0.49 W/m2, respectively, in May 2007 and were close to previously reported measurement-based estimates.

    AB - We developed a new ensemble-based data-assimilation system based on a global aerosol climate model and performed a 1-month assimilation experiment using satellite optical measurements from MODIS onboard TERRA and AQUA to estimate the direct radiative effect (DRE) of aerosols. Using the assimilated data field, monthly averaged optical thickness (AOT) was estimated to be 0.15 ± 0.030 (a 52.0% increase over a priori), and the root mean-square difference (RMSD) between modeled values and MODIS measurements was reduced by 28.4%. Independent validation using globally distributed AERONET measurements showed that the a posteriori data achieved better agreement with 82.5% of 80 AERONET sites. However, improvements in ngstrm exponents were limited (50.0% of sites). Using the assimilated aerosol field, we modeled the aerosol DRE. A posteriori whole-and clear-sky DREs at the top of the atmosphere were estimated to be-1.1 ± 0.35 and-2.5 ± 0.49 W/m2, respectively, in May 2007 and were close to previously reported measurement-based estimates.

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