气候变化领域集成服务门户(CCPortal): An idealized model sensitivity study on Dead Sea desertification with a focus on the impact on convection

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DOI	10.5194/acp-20-12011-2020
	An idealized model sensitivity study on Dead Sea desertification with a focus on the impact on convection
	Khodayar S.; Hoerner J.
发表日期	2020
ISSN	16807316
起始页码	12011
结束页码	12031
卷号	20 期号:20
英文摘要	The Dead Sea desertification-threatened region is affected by continual lake level decline and occasional but life-endangering flash floods. Climate change has aggravated such issues in the past decades. In this study, the impact on local conditions leading to heavy precipitation from the changing conditions of the Dead Sea is investigated. Idealized sensitivity simulations with the high-resolution COSMO-CLM (COnsortium for Small-scale MOdelling and Climate Limited-area Modelling) and several numerical weather prediction (NWP) runs on an event timescale are performed on the Dead Sea area. The simulations are idealized in the sense that the Dead Sea model representation does not accurately represent the real conditions but those given by an external dataset. A reference or Dead Sea simulation covering the 2003-2013 period and a twin sensitivity or bare soil simulation in which the Dead Sea is set to bare soil are compared. NWP simulations focus on heavy precipitation events exhibiting relevant differences between the Dead Sea and the bare soil decadal realization to assess the impact on the underlying convection-related processes. The change in the conditions of the Dead Sea is seen to affect the atmospheric conditions leading to convection in two ways. (a) The local decrease in evaporation reduces moisture availability in the lower boundary layer locally and in the neighbouring regions, directly affecting atmospheric stability. Weaker updraughts characterize the drier and more stable atmosphere of the simulations in which the Dead Sea has been dried out. (b) Thermally driven wind system circulations and resulting divergence/convergence fields are altered, preventing in many occasions the initiation of convection because of the omission of convergence lines. On a decadal scale, the difference between the simulations suggests a weak decrease in evaporation, higher air temperatures and less precipitation (less than 0.5%). © 2020 Author(s).
语种	英语
scopus关键词	air temperature; atmospheric convection; climate change; desertification; precipitation (climatology); sensitivity analysis; Dead Sea
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/143885
作者单位	Institute of Meteorology and Climate Research (IMK-TRO), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Mediterranean Centre for Environmental Studies (CEAM), Valencia, Spain
推荐引用方式 GB/T 7714	Khodayar S.,Hoerner J.. An idealized model sensitivity study on Dead Sea desertification with a focus on the impact on convection[J],2020,20(20).
APA	Khodayar S.,&Hoerner J..(2020).An idealized model sensitivity study on Dead Sea desertification with a focus on the impact on convection.Atmospheric Chemistry and Physics,20(20).
MLA	Khodayar S.,et al."An idealized model sensitivity study on Dead Sea desertification with a focus on the impact on convection".Atmospheric Chemistry and Physics 20.20(2020).