第六届青年地学论坛

1905 / 2019-08-30 15:19:31

Modulation of surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle

1、第四纪地质与全球变化 > 专题4：多时空尺度古气候模拟

This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by use of CAM4-BAM, the MERRA-2 surface dust concentration, and TPSH measurements. Observational and modeling results both show that the surface dust concentrations over the East Asian dust source region (EA) and over the northwestern Pacific (NP) in MAM are significantly positively correlated with TPSH. These atmospheric circulation anomalies induced by the increased TPSH result in increasing the westerly winds over both EA and NP, which in turn increases dust emissions over the dust source, and dust transports over these two regions, as well as the regional dust cycles. These results suggest that addressing the East Asian dust changes in the future climates require considering not only increasing greenhouse gas emissions but also the variations of the TP's heat source under global warming.