Booklets

09 JAN 2019 (WED) 10:30-11:30

Updated: Jan 25, 2019

Indian Monsoon During the Last 30ka

CPD2.37, 2/F Jockey Club Tower, Centennial Campus, HKU

Professor Zhang Hucai

About the Speaker:

Dr. Hucai Zhang is a professor of Physical Geography at Yunnan University. He is director of the Key Laboratory of Plateau Lake Ecology and Environment Change and also director of China-Canada Plateau Lake Research Center. He has been recognized as a Senior Talent of Yunnan Provincial government in 2010 and Government advisor on Lake Protection, and was honored as Leading Scientist by Yunnan Provincial Government in 2014. From 2004 to 2010, he worked in The State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Science where he was awarded by the One Hundred Talent Program. Professor Zhang has been engaging in lake research, especially on paleoclimate and paleoenvironment changes during Late Pleistocene since 1988 and has published more than 200 scientific papers totally in Nature Commun、Radiocarbon、PAPAPA 、QR、JGR. He is one of the key members of National Natural Science Award in 2007, and also the Vice Editor of Journal of Watershed Ecology and the Environment, editor of the International Journal of Lakes and Rivers. He has been cooperating with German research institutes, including FU Berlin, Kiel University, TU Berlin and Justus Liebig University Giessen for many years, especially FU Berlin, since 1988.


Abstract:

Indian Monsoon (IM) is a very important climate system that transport huge amount of moisture, reacts with the massive Eurasian continent and elevated Tibetan Plateau, and influences almost half of the world population. Nevertheless, decadal-centennial resolution records from real IM regime are few and how IM has changed, how it will change remains unknown. Using composed two cores from Lugu Lake in southeastern Tibetan Plateau, which extended for 880cm and 1812cm long individually, and was controlled by AMS 14C dating, the lake level fluctuations (LLF), monsoon precipitation intensity (MPI), monsoon wind intensity (MWI) and local wind intensity (LWI) during last 30ka were reconstructed. The results show that LLF of Lake Lugu followed the high-frequency MPI that temporally linked to Chinese cave recorded East Asian Summer Monsoon (EASM) intensity. Our MPI shows a reduction from the late MIS3 to a weakest period during LGM and started to increase again from 16ka BP. A strong-abrupt MPI weakening occurred at 3.5ka BP and recovered to the present condition during last 320 years. Our results demonstrate that IM is forced by the low-latitude radiation with adjusting by latitudinal thermal gradient and tropical meridional sea surface temperature (SST) contrasts.


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