气候变化领域集成服务门户(CCPortal): The impact of warm and moist airmass perturbations on arctic mixed-phase stratocumulus

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DOI	10.1175/JCLI-D-20-0163.1
	The impact of warm and moist airmass perturbations on arctic mixed-phase stratocumulus
	Eirund G.K.; Possner A.; Lohmann U.
发表日期	2020
ISSN	0894-8755
起始页码	9615
结束页码	9628
卷号	33 期号:22
英文摘要	The Arctic is known to be particularly sensitive to climate change. This Arctic amplification has partially been attributed to poleward atmospheric heat transport in the form of airmass intrusions. Locally, such airmass intrusions can introduce moisture and temperature perturbations. The effect of airmass perturbations on boundary layer and cloud changes and their impact on the surface radiative balance has received increased attention, especially over sea ice with regard to sea ice melt. Utilizing cloud-resolving model simulations, this study addresses the impact of airmass perturbations occurring at different altitudes on stratocumulus clouds for open-ocean conditions. It is shown that warm and moist airmass perturbations substantially affect the boundary layer and cloud properties, even for the relatively moist environmental conditions over the open ocean. The cloud response is driven by temperature inversion adjustments and strongly depends on the perturbation height. Boundary layer perturbations weaken and raise the inversion, which destabilizes the lower troposphere and involves a transition from stratocumulus to cumulus clouds. In contrast, perturbations occurring in the lower free troposphere lead to a lowering but strengthening of the temperature inversion, with no impact on cloud fraction. In simulations where free-tropospheric specific humidity is further increased, multilayer mixed-phase clouds form. Regarding energy balance changes, substantial surface longwave cooling arises out of the stratocumulus break-up simulated for boundary layer perturbations. Meanwhile, the net surface longwave warming increases resulting from thicker clouds for airmass perturbations occurring in the lower free troposphere. © 2020 American Meteorological Society.
英文关键词	Atmospheric humidity; Atmospheric movements; Atmospheric temperature; Climate change; Clouds; Sea ice; Troposphere; Cloud-resolving model simulations; Environmental conditions; Lower troposphere; Mixed-phase cloud; Specific humidity; Stratocumulus clouds; Temperature inversions; Temperature perturbations; Boundary layers; air mass; altitude; climate modeling; open ocean; perturbation; radiative transfer; stratocumulus; temperature inversion; Arctic
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171015
作者单位	Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland; Institute for Atmospheric and Environmental Sciences, Goethe-University Frankfurt, Frankfurt, Germany; Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Eirund G.K.,Possner A.,Lohmann U.. The impact of warm and moist airmass perturbations on arctic mixed-phase stratocumulus[J],2020,33(22).
APA	Eirund G.K.,Possner A.,&Lohmann U..(2020).The impact of warm and moist airmass perturbations on arctic mixed-phase stratocumulus.Journal of Climate,33(22).
MLA	Eirund G.K.,et al."The impact of warm and moist airmass perturbations on arctic mixed-phase stratocumulus".Journal of Climate 33.22(2020).