学术报告第201909期

报告题目： Complex network approach reveals global pattern of extreme-rainfall teleconnection

报告人：Juergen Kurths教授（Institute of Physics at the Humboldt University, Berlin）

报告时间：2019年03月21日15:00

报告地点：南一楼中311室

Abstract:

We analyse climate dynamics from a complex network approach. This leads to an inverse problem: Is there a backbone-like structure underlying the climate system? For this we propose a method to reconstruct and analyze a complex network from data generated by a spatio-temporal dynamical system. This approach enables us to uncover relations to global circulation patterns in oceans and atmosphere. We reveal the global coupling pattern of extreme-rainfall events by applying complex-network methodology to high resolution satellite data and introducing a technique that corrects for multiple-comparison bias in functional networks. We show that extreme-rainfall events in the monsoon systems of south-central Asia, east Asia and Africa are significantly synchronized. Moreover, we uncover concise links between southcentral

Asia and the European and North American extratropics, as well as the Southern Hemisphere extratropics. Analysis of the atmospheric conditions that lead to these teleconnections confirms. Rossby waves as the physical mechanism underlying these global teleconnection patterns and emphasizes their crucial role in dynamical tropical–extratropical couplings.

This concept is then applied to Monsoon data; in particular, we develop a general framework to predict extreme events by combining a non-linear synchronization technique with complex networks. This way we analyze the Indian Summer Monsoon (ISM) and identify two regions of high importance. By estimating an underlying critical point, this leads to a substantially improved prediction of the onset of the ISM.

Short Biography:

Prof. Jürgen Kurths，Professor of the Institute of Physics at the Humboldt University, Berlin. https://www.pik-potsdam.de/members/kurths.He is German physicist and mathematician. He is a chair of the research domain Transdisciplinary Concepts of the Potsdam Institute for Climate Impact Research and Professor of Nonlinear Dynamics at the Institute of Physics at the Humboldt University, Berlin.His research is mainly concerned with nonlinear physics and complex systems sciences and their applications to challenging problems in Earth system, physiology, systems biology and engineering.

Jürgen Kurths is an elected fellow of the American Physical Society and a member of the Academia Europaea. He received an Alexander von Humboldt research award and a 1000 Talents award for foreign experts from China and was awarded the L.F. Richardson Medal of the European Geosciences Union. He was bestowed with a Dr. honoris causa from the Lobachevsky University in Nizhny Novgorod in 2008 and one from the Chernishevsky University, Saratov. He is honorary professor at the University of Potsdam and at the Aberdeen University, a guest professor at the Southeast University in Nanjing, was a Burgers Visiting Professor at University of Maryland and is a Chapman Professor at the University of Alaska (Fairbanks). He is editor-in-chief of the AIP journal CHAOS and is in the editorial board of more than 10 journals. His H-index is 86 and he is a highly cited researcher.