气候变化领域集成服务门户(CCPortal): A new process-based and scale-aware desert dust emission scheme for global climate models - Part II: Evaluation in the Community Earth System Model version 2 (CESM2)

CCPortal

DOI	10.5194/acp-24-2287-2024
	A new process-based and scale-aware desert dust emission scheme for global climate models - Part II: Evaluation in the Community Earth System Model version 2 (CESM2)
	Leung, Danny M.; Kok, Jasper F.; Li, Longlei; Mahowald, Natalie M.; Lawrence, David M.; Tilmes, Simone; Kluzek, Erik; Klose, Martina; Garcia-Pando, Carlos Perez
发表日期	2024
ISSN	1680-7316
EISSN	1680-7324
起始页码	24
结束页码	4
卷号	24 期号:4
英文摘要	Desert dust is an important atmospheric aerosol that affects the Earth's climate, biogeochemistry, and air quality. However, current Earth system models (ESMs) struggle to accurately capture the impact of dust on the Earth's climate and ecosystems, in part because these models lack several essential aeolian processes that couple dust with climate and land surface processes. In this study, we address this issue by implementing several new parameterizations of aeolian processes detailed in our companion paper in the Community Earth System Model version 2 (CESM2). These processes include (1) incorporating a simplified soil particle size representation to calculate the dust emission threshold friction velocity, (2) accounting for the drag partition effect of rocks and vegetation in reducing wind stress on erodible soils, (3) accounting for the intermittency of dust emissions due to unresolved turbulent wind fluctuations, and (4) correcting the spatial variability of simulated dust emissions from native to higher spatial resolutions on spatiotemporal dust variability. Our results show that the modified dust emission scheme significantly reduces the model bias against observations compared with the default scheme and improves the correlation against observations of multiple key dust variables such as dust aerosol optical depth (DAOD), surface particulate matter (PM) concentration, and deposition flux. Our scheme's dust also correlates strongly with various meteorological and land surface variables, implying higher sensitivity of dust to future climate change than other schemes' dust. These findings highlight the importance of including additional aeolian processes for improving the performance of ESM aerosol simulations and potentially enhancing model assessments of how dust impacts climate and ecosystem changes.
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001190517800001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299501
作者单位	University of California System; University of California Los Angeles; Cornell University; National Center Atmospheric Research (NCAR) - USA; National Center Atmospheric Research (NCAR) - USA; Helmholtz Association; Karlsruhe Institute of Technology; Universitat Politecnica de Catalunya; Barcelona Supercomputer Center (BSC-CNS); ICREA
推荐引用方式 GB/T 7714	Leung, Danny M.,Kok, Jasper F.,Li, Longlei,et al. A new process-based and scale-aware desert dust emission scheme for global climate models - Part II: Evaluation in the Community Earth System Model version 2 (CESM2)[J],2024,24(4).
APA	Leung, Danny M..,Kok, Jasper F..,Li, Longlei.,Mahowald, Natalie M..,Lawrence, David M..,...&Garcia-Pando, Carlos Perez.(2024).A new process-based and scale-aware desert dust emission scheme for global climate models - Part II: Evaluation in the Community Earth System Model version 2 (CESM2).ATMOSPHERIC CHEMISTRY AND PHYSICS,24(4).
MLA	Leung, Danny M.,et al."A new process-based and scale-aware desert dust emission scheme for global climate models - Part II: Evaluation in the Community Earth System Model version 2 (CESM2)".ATMOSPHERIC CHEMISTRY AND PHYSICS 24.4(2024).