当前位置： 首页»科学研究» 科研动态 【学术讲座】Sensitivity of tropical climate to low-level clouds in the NCEP Climate Forecast System 发布时间：Thu Jun 16 12:09:00 CST 2011

Topic :Sensitivity of tropical climate to low-level clouds in the NCEP Climate Forecast System

Speaker : 胡增臻 博士

美国大气海洋局（ＮＯＡＡ）气候预测中心（ＣＰＣ）的气象学家，联邦政府雇员。主要从事气候模拟、气候变率和可预报性的诊断分析、ＥＮＳＯ、大西洋海气相互作用、亚洲年际和年代际气候变率和全球变暖

Abstract: In this work, we examine the sensitivity of tropical mean climate and seasonal cycle to low clouds and cloud liquid water path (CLWP) by prescribing them in the NCEP climate forecast system (CFS). It is found that the change of low cloud cover alone has a minor influence on the amount of net shortwave radiation reaching the surface and on the warm biases in the southeastern Atlantic. Based on the results from these sensitivity experiments, we propose a model bias correction approach, in which CLWP is prescribed only in the southeastern Atlantic by using observed annual mean climatology of CLWP. It is shown that the warm biases in the southeastern Atlantic are largely eliminated, and the seasonal cycle in the tropical Atlantic Ocean is significantly improved. Prescribing CLWP in the CFS is then an effective interim technique to reduce model biases and to improve the simulation of seasonal cycle in the tropics.

Host : Prof. Fengsheng Zhao

Time: 15:00-16:00 PM, 17th Jun(Friday), 2011

Venue: GCESS Simulation Hall,1st floor,Sci&Tech Building

Welcome to Participate!

 

 

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