气候变化领域集成服务门户(CCPortal): The Arctic Polar Vortex Response to Volcanic Forcing of Different Strengths

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DOI	10.1029/2020JD034450
	The Arctic Polar Vortex Response to Volcanic Forcing of Different Strengths
	Azoulay A.; Schmidt H.; Timmreck C.
发表日期	2021
ISSN	2169897X
卷号	126 期号:11
英文摘要	Tropical volcanic eruptions injecting sulfur into the stratosphere are assumed to not only scatter radiation and cool Earth's surface but also alter atmospheric circulation and in particular to strengthen the stratospheric polar vortex in boreal winter. The exact impact is difficult to estimate because of the small number of well observed eruptions and the high internal variability of the vortex. We use large (100-member) ensembles of simulations with an Earth system model for idealized volcanic aerosol distributions resulting from sulfur injections between 2.5 and 20 Tg. We suggest the existence of a threshold somewhere between 2.5 and 5 Tg(S) below which the vortex does not show a detectable response to the injection. This nonlinearity is introduced partly through the infrared aerosol optical density which increases much stronger than linear with increasing particle size occurring for increasing injection amount. Additionally, the dynamical mechanism causing the vortex strengthening seems not to set in for small aerosol loading. Furthermore, we add to the recent discussion concerning a possible downward propagation of the circulation response leading to a winter warming in Northern Eurasia. At latitudes northward of about 50°N, our simulations do show such an average warming pattern that is statistically significant for injections of 10 Tg(S) or more. © 2021. The Authors.
英文关键词	polar vortex; volcanic forcing
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185182
作者单位	Max Planck Institute for Meteorology, Hamburg, Germany; Now at Remote Sensing Technology Institute (IMF), German Aerospace Center (DLR), Oberpfaffenhofen, Germany
推荐引用方式 GB/T 7714	Azoulay A.,Schmidt H.,Timmreck C.. The Arctic Polar Vortex Response to Volcanic Forcing of Different Strengths[J],2021,126(11).
APA	Azoulay A.,Schmidt H.,&Timmreck C..(2021).The Arctic Polar Vortex Response to Volcanic Forcing of Different Strengths.Journal of Geophysical Research: Atmospheres,126(11).
MLA	Azoulay A.,et al."The Arctic Polar Vortex Response to Volcanic Forcing of Different Strengths".Journal of Geophysical Research: Atmospheres 126.11(2021).