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Climate responses to direct radiative forcing of anthropogenic aerosols, tropospheric ozone, and long-lived greenhouse gases in eastern China over 1951-2000


doi: 10.1007/s00376-009-9032-4

  • A unified chemistry-aerosol-climate model is applied in this work to compare climate responses to changing concentrat, ions of long-lived greenhouse gases (GHGs, CO2, CH4, N2O, tropospheric O3, and aerosols during the years 1951--2000. Concentrations of sulfate, nitrate, primary organic carbon (POA), secondary organic carbon (SOA), black carbon (BC) aerosols, and tropospheric O3 for the years 1950 and 2000 are obtained a priori by coupled chemistry-aerosol-GCM simulations, and then monthly concentrations are interpolated linearly between 1951 and 2000. The annual concentrations of GHGs are taken from the IPCC Third Assessment Report. BC aerosol is internally mixed with other aerosols. Model results indicate that the simulated climate change over 1951--2000 is sensitive to anthropogenic changes in atmospheric components. The predicted year 2000 global mean surface air temperature can differ by 0.8o with different forcings. Relative to the climate simulation without changes in GHGs, O3, and aerosols, anthropogenic forcings of SO2-4, BC, BC+SO2-4, BC+SO2-4+POA, BC+SO2-4+POA+SOA+NO-3, O3, and GHGs are predicted to change the surface air temperature averaged over 1971--2000 in eastern China, respectively, by -0.40oC, +0.62oC, +0.18oC, +0.15oC, -0.78oC, +0.43oC, and +0.85oC, and to change the precipitation, respectively, by -0.21, +0.07, -0.03, +0.02, -0.24, -0.08, and +0.10 mm d-1. The authors conclude that all major aerosols are as important as GHGs in influencing climate change in eastern China, and tropospheric O3 also needs to be included in studies of regional climate change in China.
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Manuscript received: 10 July 2009
Manuscript revised: 10 July 2009
通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Climate responses to direct radiative forcing of anthropogenic aerosols, tropospheric ozone, and long-lived greenhouse gases in eastern China over 1951-2000

  • 1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; Graduate University of Chinese Academy of Sciences, Beijing 100049,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; Climate Change Research Center {\rm ({\it CCRC})}, Chinese Academy of Sciences, Beijing 100029

Abstract: A unified chemistry-aerosol-climate model is applied in this work to compare climate responses to changing concentrat, ions of long-lived greenhouse gases (GHGs, CO2, CH4, N2O, tropospheric O3, and aerosols during the years 1951--2000. Concentrations of sulfate, nitrate, primary organic carbon (POA), secondary organic carbon (SOA), black carbon (BC) aerosols, and tropospheric O3 for the years 1950 and 2000 are obtained a priori by coupled chemistry-aerosol-GCM simulations, and then monthly concentrations are interpolated linearly between 1951 and 2000. The annual concentrations of GHGs are taken from the IPCC Third Assessment Report. BC aerosol is internally mixed with other aerosols. Model results indicate that the simulated climate change over 1951--2000 is sensitive to anthropogenic changes in atmospheric components. The predicted year 2000 global mean surface air temperature can differ by 0.8o with different forcings. Relative to the climate simulation without changes in GHGs, O3, and aerosols, anthropogenic forcings of SO2-4, BC, BC+SO2-4, BC+SO2-4+POA, BC+SO2-4+POA+SOA+NO-3, O3, and GHGs are predicted to change the surface air temperature averaged over 1971--2000 in eastern China, respectively, by -0.40oC, +0.62oC, +0.18oC, +0.15oC, -0.78oC, +0.43oC, and +0.85oC, and to change the precipitation, respectively, by -0.21, +0.07, -0.03, +0.02, -0.24, -0.08, and +0.10 mm d-1. The authors conclude that all major aerosols are as important as GHGs in influencing climate change in eastern China, and tropospheric O3 also needs to be included in studies of regional climate change in China.

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