报告题目：Global climate impacts of the Indian Ocean warming: some overlooked aspects
报告人：Shineng Hu, Lamont Doherty Earth Observatory, Columbia University
报告内容：The tropical Indian Ocean (TIO) has warmed progressively by 1°C since the 1950s and will probably continue to warm as the atmospheric carbon dioxide level keeps rising. In this talk, I will discuss how the TIO warming could influence global climate via interacting with the Atlantic Ocean, which has been largely overlooked before. For the fast response, the TIO warming could strengthen the surface westerly winds over the subpolar North Atlantic and therefore cool the underlying ocean within less than a few years. This mechanism could potentially explain the suppressed warming trend in the subpolar North Atlantic (i.e. the so-called warming hole) during the historical warming period. For the slow response, the TIO warming could increase the tropical Atlantic salinity via rainfall reduction and thus strengthen the Atlantic meridional overturning circulation (AMOC) after several decades. The resultant AMOC strengthening then leads to a warmer global mean surface temperature, a stronger hemispheric asymmetry, and a northward shifted intertropical convergence zone (ITCZ). Implications for past and future climate changes will be discussed.
报告人简介：胡世能，2012年本科毕业于北京大学，2018年博士毕业于耶鲁大学，现于哥伦比亚大学Lamont-Doherty地球观测所从事博士后工作。主要研究方向为海气相互作用和气候动力。目前研究的课题包括极端厄尔尼诺的动力机制，海洋洋盆间相互作用，全球变暖下的区域气候变化机制，以及古气候模拟。近年来在Nature Climate Change，PNAS等刊物发表论文十余篇。