Aerosol Direct Radiative and Cloud Adjustment Effects on Surface Climate over Eastern China: Analyses of WRF Model Simulations

• DOI: 10.1175/jcli-d-18-0236.1
• Publication Date: 2018-12-31T14:52:40Z
• Authors: Yangyang Song; Guoxing Chen; Wei-Chyung Wang
• Keywords: Forcing (mathematics); Cloud forcing

The WRF-simulated changes in clouds and climate due to the increased anthropogenic aerosols for summers of 2002–08 (vs 1970s) over eastern China were used offline calculate radiative forcings associated with aerosol–radiation (AR) aerosol–cloud–radiation (ACR) interactions, which subsequently facilitated interpretation surface temperature changes. During this period, increases aerosol optical depth (ΔAOD) averaged range from 0.18 2004 0.26 2007 as compared corresponding cases 1970s, multiyear means (standard deviations) AR ACR at are −6.7 (0.58) −3.5 (0.63) W m −2 , respectively, indicating importance cloud affecting both forcing its interannual variation. simulated mean cooling is 0.35°C, dominated by a positive (cooling) feedback meteorology (~10%), two negative (warming) feedbacks decreases latent (~70%) sensible (~20%) heat fluxes. More detailed spatial characteristics analyzed using ensemble simulations year 2008. Three regions—Jing-Jin-Ji (ΔAOD ~ 0.63), Sichuan basin 0.31), middle Yangtze River valley 0.26)—at different regimes selected investigate relative roles ACR. While closely related ΔAOD values, presents regional owing In addition, flux also between regions. study thus illustrates that useful diagnostic parameter unravel complexity change China.