Aerosol distributions and radiative forcing over the Asian Pacific region simulated by Spectral Radiation-Transport Model for Aerosol Species (SPRINTARS)

Toshihiko Takemura, Teruyuki Nakajima, Akiko Higurashi, Sachio Ohta, Nobuo Sugimoto

    Research output: Contribution to journalArticle

    55 Citations (Scopus)

    Abstract

    A three-dimensional aerosol transport-radiation model coupled with a general circulation model, Spectral Radiation-Transport Model for Aerosol Species (SPRINTARS), simulates atmospheric aerosol distributions and optical properties. The simulated results are compared with aerosol sampling and optical observations from ground, aircraft, and satellite acquired by intensive observation campaigns over east Asia in spring 2001. Temporal variations of the aerosol concentrations, optical thickness, and Ångström exponent are in good agreement between the simulation and observations. The midrange values of the Ångström exponent, even at the Asian dust storm events over the outflow regions, suggest that the contribution of the anthropogenic aerosol, such as carbonaceous and sulfate, to the total optical thickness is of an order comparable to that of the Asian dust. The radiative forcing by the aerosol direct and indirect effects is also calculated. The negative direct radiative forcing is simulated to be over - 10 W m-2 at the tropopause in the air mass during the large-scale dust storm, to which both anthropogenic aerosols and Asian dust contribute almost equivalently. The direct radiative forcing, however, largely depends on the cloud water content and the vertical profiles of aerosol and cloud. The simulation shows that not only sulfate and sea salt aerosols but also black carbon and soil dust aerosols, which absorb solar and thermal radiation, make strong negative radiative forcing by the direct effect at the surface, which may exceed the positive forcing by anthropogenic greenhouse gases over the east Asian region.

    Original languageEnglish
    Pages (from-to)ACE 27-1 - ACE 27-10
    JournalJournal of Geophysical Research D: Atmospheres
    Volume108
    Issue number23
    Publication statusPublished - Dec 16 2003

    Fingerprint

    radiative forcing
    radiation transport
    aerosols
    Aerosols
    aerosol
    Radiation
    Dust
    dust storms
    dust
    dust storm
    Sulfates
    optical thickness
    sulfates
    radiation
    distribution
    radiative transfer
    Soot
    thermal radiation
    exponents
    Atmospheric aerosols

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Forestry
    • Oceanography
    • Aquatic Science
    • Ecology
    • Water Science and Technology
    • Soil Science
    • Geochemistry and Petrology
    • Earth-Surface Processes
    • Atmospheric Science
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science
    • Palaeontology

    Cite this

    Aerosol distributions and radiative forcing over the Asian Pacific region simulated by Spectral Radiation-Transport Model for Aerosol Species (SPRINTARS). / Takemura, Toshihiko; Nakajima, Teruyuki; Higurashi, Akiko; Ohta, Sachio; Sugimoto, Nobuo.

    In: Journal of Geophysical Research D: Atmospheres, Vol. 108, No. 23, 16.12.2003, p. ACE 27-1 - ACE 27-10.

    Research output: Contribution to journalArticle

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