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Estimation of Aerosol Radiative Forcing by AGCM

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한국환경과학회지 (Journal of Environmental Science International)
한국환경과학회 (The Korean Environmental Sciences Society)
초록

Many recent studies have concentrated upon the radiative effects of atmospheric aerosols. Though their scattering and absorption of radiation, aerosols can also induce some other important environment effects. In this study, new radiation code and aerosol data within Atmosphere General Circulation Model (AGCM) is used to assess the aerosol radiative forcing and to analyze relative climate effects. The new Kangnung National University AGCM Stratospheric-15 (KNU AGCM ST15) was integrated by using two sets of radiative effect of aerosols : CTRL as not a radiative effect of aerosols and AERO as a radiative effect of aerosols. Two cases show the difference of net shortwave radiation budget at top-of-atmosphere (TOA) is found to be about -3.4 Wm-2, at the surface (SFC) is about -5.6 Wm-2. Consequently the mean atmospheric absorption due to aerosol layer in global is about 2.2 Wm-2. This result confirms the existence of a negative forcing due to the direct effect of aerosols at the surface and TOA in global annual mean. In addition, it is found that cooling over at the surface air temperature due to radiative effect of aerosols is about 0.17 ℃. It is estimated that radiative forcing of the net upward longwave radiation taken as the indirect effect of aerosol is much smaller than that of the direct effect as there is about 0.2 Wm-2 of positive forcing both at TOA and at SFC. From this study, It made an accurate estimation of considering effect of aerosols that is negative effect. This may slow the rate of projected global warming during the 21st century.

저자
  • 홍성철(국립환경과학원 지구환경연구소) | Sung-Chul Hong Corresponding Author
  • 정일웅(강릉대학교 대가환경과학과) | Il-Ung Chung
  • 김형진(IPRC/University of Hawaii) | Hyung-Jin Kim
  • 이규태(강릉대학교 대가환경과학과) | Kyu-Tae Lee
  • 이재범(국립환경과학원 지구환경연구소) | Jae-bum Lee