资源环境科技发展态势分析平台

Abstract. With high emissions of aerosols and the known world’s “Third Pole” of the Tibet Plateau (TP) in East Asia, knowledge on the energy budget over this region is widely concerned. This study first attempts to estimate the present-day land energy balance over East Asia by combining surface and satellite observations, as well as the atmospheric reanalysis and Coupled Model Intercomparison Project phase 6 (CMIP6) simulations. Compared to the global land budget, a substantially larger fraction of atmospheric shortwave radiation of 5.2 % is reflected, highly associated with the higher aerosol loadings and more clouds over East Asian land. While a slightly smaller fraction of atmospheric shortwave absorption of 0.6 % is unexpectedly estimated, possibly related to the lower water vapor content effects due to the thinner air over the TP to overcompensate for the aerosol and cloud effects over East Asian land. The weaker greenhouse effect and fewer low clouds due to the TP are very likely the causes for the smaller fraction of East Asian-land surface downward longwave radiation. Hence, high aerosol loadings, clouds, and the TP over East Asia play vital roles in the shortwave budgets, while the TP is responsible for the longwave budgets during this regional energy budget assessment. The further obtained cloud radiative effects suggest that the presence of clouds results in a larger cooling effect on the climate system over East Asian land than that over globe. This study helps understand the potential factors influencing the diversifying energy budget assessments over regions.