L12: Radiation-Topography Interaction

Regional and Tele-connected Impacts of Radiation-Topography Interaction over the Tibetan Plateau

• @Dalei Hao

• dalei.hao@pnnl.gov

@Dalei Hao @Gautam Bisht @Ruby Leung

Land - River - Human

Ecosystem project

The radiation-topography interaction plays an important role in controlling the surface energy balance over the Tibetan Plateau (TP). However, how such interaction over the TP impacts the climate systems in local and remote Asian regions remains unclear. This study uses the Energy Exascale Earth System Model (E3SM) to evaluate the regional and tele-connected impacts of radiation-topography interaction over the TP. The land-atmosphere coupled experiments show that topography regulates surface energy balance, snow processes and climate dynamics over the TP across seasons. Accounting for radiation-topography interaction overall improves the E3SM performance on simulating the TP’s surface and climate dynamics. The cold bias in winter air temperature decreases from 4.48 to 3.70 K in winter, and the wet bias in summer precipitation is mitigated in the southern TP. Considering the TP’s radiation-topography interaction further reduces the simulated biases of the South and East Asian summer precipitation. Our results improve the understanding of topographic roles in regional climate over the TP, and highlight its critical tele-connected climate impacts.

yes

dalei.hao@pnnl.gov