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Simulating Aerosol Optical Depth and Direct Radiative Effects over the Tibetan Plateau with a high-resolution CAS FGOALS-f3 model

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Advances in Atmospheric Sciences 2022年第12期39卷 2137-2155,I0020-I0022页

作者： Min ZHAO Tie DAI Hao WANG Qing BAO Yimin LIU Hua ZHANG Guangyu SHI State Key Laboratory of Numerical modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100049China International Center for climate and Environment Science Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China

Current global climate models cannot resolve the complex topography over the Tibetan Plateau(TP)due to their coarse *** study investigates the impacts of horizontal resolution on simulating aerosol and its direct radiative effect(DRE)over the TP by applying two horizontal resolutions of about 100 km and 25 km to the Chinese Academy of Sciences Flexible Global Ocean-Atmosphere Land System(CAS FGOALS-f3)over a 10-year *** to the AErosol RObotic NETwork observations,a high-resolution model(HRM)can better reproduce the spatial distribution and seasonal cycles of aerosol optical depth(AOD)compared to a low-resolution model(LRM).The HRM bias and RMSE of AOD decreased by 0.08 and 0.12,and the correlation coefficient increased by 0.22 compared to the *** LRM is not sufficient to reproduce the aerosol variations associated with fine-scale topographic forcing,such as in the eastern marginal region of the *** difference between hydrophilic aerosols in an HRM and LRM is caused by the divergence of the simulated relative humidity(RH).More reasonable distributions and variations of RH are conducive to simulating hydrophilic *** increase of the 10-m wind speed in winter by an HRM leads to increased dust *** simulated aerosol DREs at the top of the atmosphere(TOA)and at the surface by the HRM are–0.76 W m^(–2)and–8.72 W m^(–2)over the TP,*** resolution models can capture the key feature that dust TOA DRE transitions from positive in spring to negative in the other seasons.

关键词： Tibetan Plateau high-resolution climate model aerosol optical depth aerosol direct radiative effect

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