气候变化领域集成服务门户(CCPortal): The foehn effect during easterly flow over Svalbard

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DOI	10.5194/acp-22-1529-2022
	The foehn effect during easterly flow over Svalbard
	Shestakova, Anna A.; Chechin, Dmitry G.; Luepkes, Christof; Hartmann, Joerg; Maturilli, Marion
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	1529
结束页码	1548
卷号	22 期号:2 页码:20
英文摘要	This article presents a comprehensive analysis of the foehn episode which occurred over Svalbard on 30-31 May 2017. This episode is well documented by multiplatform measurements carried out during the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) and Physical feedbacks of Arctic PBL, Sea ice, Cloud And AerosoL (PASCAL) campaigns. Both orographic wind modification and foehn warming are considered here. The latter is found to be primarily produced by the isentropic drawdown, which is evident from observations and mesoscale numerical modeling. The structure of the observed foehn warming was in many aspects very similar to that for foehns over the Antarctic Peninsula. In particular, it is found that the warming was proportional to the height of the mountain ridges and propagated far downstream. Also, a strong spatial heterogeneity of the foehn warming was observed with a clear cold footprint associated with gap flows along the mountain valleys and fjords. On the downstream side, a shallow stably stratified boundary layer below a well-mixed layer formed over the snow-covered land and cold open water. The foehn warming downwind of Svalbard strengthened the north-south horizontal temperature gradient across the ice edge near the northern tip of Svalbard. This suggests that the associated baroclinicity might have strengthened the observed northern tip jet. A positive daytime radiative budget on the surface, increased by the foehn clearance, along with the downward sensible heat flux provoked accelerated snowmelt in the mountain valleys in Ny-angstrom lesund and Adventdalen, which suggests a potentially large effect of the frequently observed Svalbard foehns on the snow cover and the glacier heat and mass balance.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000751425500001
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/273594
作者单位	Russian Academy of Sciences; Obukhov Institute of Atmospheric Physics of Russian Academy of Sciences; Helmholtz Association; Alfred Wegener Institute, Helmholtz Centre for Polar & Marine Research; Helmholtz Association; Alfred Wegener Institute, Helmholtz Centre for Polar & Marine Research
推荐引用方式 GB/T 7714	Shestakova, Anna A.,Chechin, Dmitry G.,Luepkes, Christof,et al. The foehn effect during easterly flow over Svalbard[J],2022,22(2):20.
APA	Shestakova, Anna A.,Chechin, Dmitry G.,Luepkes, Christof,Hartmann, Joerg,&Maturilli, Marion.(2022).The foehn effect during easterly flow over Svalbard.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(2),20.
MLA	Shestakova, Anna A.,et al."The foehn effect during easterly flow over Svalbard".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.2(2022):20.