Solving the Coarse Dust Conundrum: What Processes Cause Large-scale Models to Underestimate Coarse Dust Transport?

GSTDTAP

项目编号	1856389
	Solving the Coarse Dust Conundrum: What Processes Cause Large-scale Models to Underestimate Coarse Dust Transport?
	Jasper Kok (Principal Investigator)
主持机构	University of California-Los Angeles
项目开始年	2019
	2019-06-01
项目结束日期	2022-05-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	796536(USD)
国家	美国
语种	英语
英文摘要	At any given time, our atmosphere contains tens of millions of metric tons of desert dust. This dust seeds clouds and scatters and absorbs sunlight and, when it settles from our atmosphere, fertilizes ecosystems and darkens snow and ice. Basic physics predicts that coarse dust particles - still no larger than the thickness of a human hair - quickly settle out of the atmosphere. However, measurements indicate that this is not the case; instead, coarse dust can remain in the atmosphere for days and travel thousands of kilometers from its source. This dust therefore has more time to impact the Earth and its weather and climate. This makes it critical to determine the processes that cause dust to stay in the atmosphere longer than expected, and account for these missing processes in climate and weather models. This project uses Large Eddy Simulations (LES) and other techniques to test three hypotheses of the nature of the process(es) that help keep coarse dust aloft. Specifically, this project tests whether dust asphericity, electrification, and / or turbulence in dusty layers keep dust aloft against the action of gravitational settling. The project will result in a parameterization of dust gravitational settling that includes these missing processes and that can be used in weather and climate models. This will allow these models to more accurately represent desert dust in the atmosphere and its impact on the Earth system. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/213446
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Jasper Kok .Solving the Coarse Dust Conundrum: What Processes Cause Large-scale Models to Underestimate Coarse Dust Transport?.2019.