全球变化科学紫荆论坛（第252期）： Improved representations of surface spectral emissivity and cloud longwave scattering in a global climate model for more realistic atmosphere-surface radiative coupling
报告人:
Prof. Xianglei Huang
University of Michigan
报告时间:
2018-06-22 10:00
报告地点:
清华地学系蒙民伟科技大楼南楼S818
主办单位:
地球系统科学系
简介:
Surface longwave emissivity can be less than unity and vary significantly with frequency. However, most climate models still assume a blackbody surface in the longwave (LW) radiation scheme of their atmosphere models. This study incorporates realistic surface spectral emissivity into the atmospheric component of the Community Earth System Model (CESM) and evaluates its impact on simulated climate. The global-mean surface temperature difference between the modified and standard CESM simulation is 0.20 K for the fully coupled run and 0.45 K for the slab-ocean run. Noticeable surface temperature differences between the modified and standard CESM simulations are seen over the Sahara desert and polar regions. Accordingly, the climatological mean sea ice fraction in the modified CESM simulation can be less than that in the standard CESM simulation by as much as 0.1 in some regions.
