Environmental & Climate Sciences Department Seminar

"Modeling East Asian Dust and Its Radiative Feedbacks"

Presented by Xiaoning Xie, Institute of Earth Environment, Chinese Academy of Sciences, China

Tuesday, December 17, 2019, 3:00 pm — Large Conference Room, Bldg. 490

East Asia is a major source of global dust aerosols originating from the Taklamakan desert and the Gobi desert. Over this region, the estimated several hundred Tg per year of dusts are emitted directly into the air and partly transported to downstream land and ocean regions through westerly winds, e.g., eastern China and northern Pacific, which significantly affect the global and regional energy balance, climate and hydrological cycle by dust direct radiative forcing (DRF) and dust-in-snow radiative forcing (SRF) based on previous studies. This study shows the DRF and SRF and their feedbacks on the regional climate and the dust cycle over East Asia through the use of the Community Atmosphere Model version 4 with a Bulk Aerosol Model parameterizations of the dust size distribution (CAM4-BAM). Our results show that SRF increases the eastern Asian dust emissions significantly by 13.7% in the spring, countering a 7.6% decrease in the regional emissions by DRF. We proposed a significant feature of SRF on the Tibetan Plateau (TP) is the creation of a positive feedback loop that affects the dust cycle over eastern Asia through enhancing the TP heat source. Additionally, we also examine the relationship in the interannual variability between the TP heat source and East Asian dust cycle from observations and models to check this new feedback.

Hosted by: Yangang Liu

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