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南京大学张肖剑博士在我室报告
来源:LASG    访问次数:    更新时间:2018-8-20

Causes of precipitation changes in Central Asia since the Last Glacial Maximum

张肖剑 博士
南京大学地理与海洋科学学院

2018年8月20日(星期一)10:00
新楼1118会议室

报告会主持人:李立娟 研究员

Abstract
There are significant differences in the interpretation of the moisture (precipitation) history of Central Asia since the Last Glacial Maximum (LGM), as inferred on one hand from speleothem oxygen isotope records, and on the other from lake sediments and loess-paleosol sequences. This talk will discuss precipitation changes in Central Asia since the LGM and their control factors using results from the “Simulation of Transient Climate Evolution over the last 21,000 years”. Transient simulations reveal that a wet climate occurred during the LGM, the Bølling-Allerød warm period, and the middle Holocene, and a dry climate occurred during Heinrich event 1, the Younger Dryas, and the early Holocene in this area. These changes were mainly controlled by Earth's orbital parameters, meltwater discharges into the oceans and continental ice sheets. The contribution of GHG concentrations to precipitation changes was minor. External forcing factors influenced the precipitation mainly through affecting the water vapor input from the North Atlantic and Mediterranean Sea, and vertical motions of the atmosphere over Central Asia. The North Atlantic Oscillation was an important atmospheric bridge connecting the external forcings to precipitation changes in Central Asia.

 
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