气候变化领域集成服务门户(CCPortal): Eulerian and Lagrangian views of warm and moist air intrusions into summer Arctic

CCPortal

DOI	10.1016/j.atmosres.2021.105586
	Eulerian and Lagrangian views of warm and moist air intrusions into summer Arctic
	You C.; Tjernström M.; Devasthale A.
发表日期	2021
ISSN	0169-8095
卷号	256
英文摘要	In this study, warm and moist air intrusions (WaMAI) over the sea sectors of Kara, Laptev, East Siberian and Beaufort from 1979 to 2018 are identified in ERA5 reanalysis and their air-mass transformation is analysed using interpolation in ERA5 and satellite products along trajectories. The analysis shows that WaMAIs, driven by blocking high-pressure systems over the respective ocean sectors, induce surface warming (11–18 W m−2) and sea ice melt from positive anomalies of net longwave radiation (5–8 W m−2) and turbulent flux (8–13 W m−2) to the surface, although the anomaly of net shortwave radiation (−9 ~ +1 W m−2) is negative. From a Lagrangian perspective, the surface energy-budget anomaly decreases linearly, while total column cloud liquid water (TCLW) increases linearly with the downstream distance from the sea-ice edge. However, the cloud radiative effects of both longwave and shortwave radiation reach an equilibrium as TCLW increases in a much lower rate beyond 7 degrees north of the sea ice edge. The boundary-layer energy-budget pattern can be categorized into two classes: radiation-dominated and turbulence-dominated, comprised of 26% and 62% WaMAIs respectively. Statistically, turbulence-dominated cases occur with 3 times stronger large-scale subsidence, and also feature a larger anomaly in net shortwave radiation. In radiation-dominated WaMAIs, stratocumulus develops more strongly and hence exerts larger longwave and shortwave forcing to the surface. In both categories, a well-mixed boundary layer deepens by 500 m along the trajectories, from the continuous turbulent mixing. © 2021 The Author(s)
英文关键词	Arctic climate; Boundary-layer; Trajectories; Warm and moist air intrusion
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236770
作者单位	Department of Meteorology & Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Remote Sensing Unit, Research and Development Department, Swedish Meteorological and Hydrological Institute, Norrköping, Sweden
推荐引用方式 GB/T 7714	You C.,Tjernström M.,Devasthale A.. Eulerian and Lagrangian views of warm and moist air intrusions into summer Arctic[J],2021,256.
APA	You C.,Tjernström M.,&Devasthale A..(2021).Eulerian and Lagrangian views of warm and moist air intrusions into summer Arctic.Atmospheric Research,256.
MLA	You C.,et al."Eulerian and Lagrangian views of warm and moist air intrusions into summer Arctic".Atmospheric Research 256(2021).