TY - JOUR

T1 - Relative contributions to surface shortwave irradiance over China

T2 - A new index of potential radiative forcing

AU - Kawamoto, Kazukawa

AU - Hayasaka, T.

PY - 2008/9/16

Y1 - 2008/9/16

N2 - The contributions of atmospheric factors to surface shortwave irradiance (S) variability was investigated, using radiative transfer calculations to examine all sky (both cloud-free and cloudy) conditions. We defined the sensitivities of S to differential increases from given values of cloud, aerosol, and water vapor as potential radiative forcing (PRF). Thus, the expected change in S due to one factor would be the product of the PRF and the change in that factor. Geographical features of the PRF were described over China in January and July, and then the PRF was applied to evaluate the relative contributions of related factors to S variability over Jinan (the central-eastern China) during 1984 and 1990. Although some shortcomings were pointed out, the usefulness of the PRF was confirmed for determining the relative contributions. In particular, to use accurate aerosol absorption properties was suggested to be crucial for quantitative radiation budget estimates.

AB - The contributions of atmospheric factors to surface shortwave irradiance (S) variability was investigated, using radiative transfer calculations to examine all sky (both cloud-free and cloudy) conditions. We defined the sensitivities of S to differential increases from given values of cloud, aerosol, and water vapor as potential radiative forcing (PRF). Thus, the expected change in S due to one factor would be the product of the PRF and the change in that factor. Geographical features of the PRF were described over China in January and July, and then the PRF was applied to evaluate the relative contributions of related factors to S variability over Jinan (the central-eastern China) during 1984 and 1990. Although some shortcomings were pointed out, the usefulness of the PRF was confirmed for determining the relative contributions. In particular, to use accurate aerosol absorption properties was suggested to be crucial for quantitative radiation budget estimates.

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U2 - 10.1029/2008GL035083

DO - 10.1029/2008GL035083

M3 - Article

AN - SCOPUS:57049101476

VL - 35

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 17

M1 - L17809

ER -