清华论坛Tsinghua Forum第93期：

演讲人：达拉·伊特哈比

麻省理工学院教授，美国工程院院士

Professor of Massachusetts Institute of Technology (MIT)

Member of the National Academy of Engineering

时间：2019年10月24日（周四）15:00-16:00

Time: October 24,2019, 15:00-16:00

演讲地点：清华大学主楼接待厅

Location: Reception Hall of Main Building, Tsinghua University

报告主题：气候系统中水循环的关联、变率与变化

Title: Links, Variability and Change of the Water Cycle within the Climate System

报告简介：水在所有相态（气、液、固）下的运动循环都与气候系统的能量循环紧密关联，水同时也是包括碳循环在内的全球生物地球化学循环中的重要变量。 水循环、能量循环、生物地球化学循环相互关联，任何一个循环的变率和变化都会影响其他循环，而循环间的关联耦合强度决定了其相互影响程度。目前，地球系统模式中各循环间的耦合强度存在多种预先的设定，进而导致了模式对气候变率和变化的预估的不确定性。本报告将介绍如何利用卫星遥感的新观测以形成在地球系统中主要循环间基于观测的耦合强度估计。水循环在气候系统中以及未来区域水供应中的作用也将在本报告中介绍。

Abstract: The occurrence and movement of water in all its phases (liquid, vapor and solid) is intimately linked to the energy cycle of the climate system. It is also a major factor in several of the global biogeochemical cycles, including Carbon. Variability and change in any one of the cycles affects the others. The strength of the couplings determines the degree of the effects. Current Earth System models have a wide range of prescribed degree of couplings among the cycles that leads to uncertainty in the projection of climate variability and change. In this presentation new measurements from a set of Earth-orbiting satellite instruments are used to form observation-based estimates of coupling among the major global cycles. Implications for the role of the water cycle in the climate system and future regional water availability are addressed in this presentation.

演讲人简介：达拉·伊特哈比是麻省理工学院（MIT）土木与环境工程系白佳迪和斯德哥尔摩水基金讲席教授，同时兼任地球、大气和行星科学系教授。他的研究兴趣包括地表、地下、大气水文系统的耦合和陆表遥感。他于1990年获得麻省理工学院土木工程博士学位。他是美国气象学会（AMS）、美国地球物理联盟（AGU）和电气电子工程师协会（IEEE）的会士，美国工程院院士。

Bio: Dara Entekhabi is the Bacardi and Stockholm Water Foundations Professor at the Massachusetts Institute of Technology (MIT) in the Department of Civil and Environmental Engineering，and also a professor of Department of Earth, Atmospheric and Planetary Sciences. His research interests are coupled surface, subsurface, and atmospheric hydrologic systems and terrestrial remote sensing. He received his Ph.D. in civil engineering from MIT in 1990. He is a Fellow of the American Meteorological Society, the American Geophysical Union and the Institute of Electrical and Electronics Engineers. He is a member of the National Academy of Engineering.