气候变化领域集成服务门户(CCPortal): Boreal winter stratospheric variability in EC-EARTH: High-Top versus Low-Top

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DOI	10.1007/s00382-020-05162-0
	Boreal winter stratospheric variability in EC-EARTH: High-Top versus Low-Top
	Palmeiro F.M.; García-Serrano J.; Bellprat O.; Bretonnière P.-A.; Doblas-Reyes F.J.
发表日期	2020
ISSN	0930-7575
起始页码	3135
结束页码	3150
卷号	54
英文摘要	The European Consortium EC-EARTH climate model version 3.1 is used to assess the role of a well-resolved stratosphere on stratospheric teleconnections in the Northern Hemisphere winter. Two simulations of 100 years with constant radiative forcing, one with top at 0.01 hPa (L91, High-Top) and other with top at 5 hPa (L62, Low-Top) are compared. Results show how High-Top is able to generate a realistic Quasi-Biennial Oscillation in the tropical stratosphere, and to capture its teleconnection to the extratropics. On the other hand, EC-EARTH properly simulates the leading modes of variability (EOFs) of the polar stratosphere in both High-Top and Low-Top configurations, although the El Niño-related wave-like teleconnection dominates the signal of EOF3 (wavenumber 1 at 50 hPa) in High-Top, as in reanalysis, while the tropics-unrelated Pacific/North America pattern does it in Low-Top. At subseasonal time-scale, High-Top shows larger sudden stratospheric warming (SSW) occurrence in mid-winter, which is close to the documented in observational records, while SSW occurrence peaks by late-winter in Low-Top, despite both show a similar SSW decadal frequency (i.e. around 8 events per decade). Examination of the climatological eddy heat flux shows a misrepresentation of the seasonal cycle in Low-Top, with a peak in late-winter that explains the timing of SSW increase. This peak of the eddy heat flux can be traced to the wave injection over Central Siberia in the lower stratosphere, which appears to be dominated by small-scale waves (wavenumbers 3–4). It follows that simulating realistic eddy heat flux seasonality is fundamental to obtain a realistic SSW seasonal cycle. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atmospheric teleconnections; Climate model resolution; Stratospheric dynamics; Stratospheric variability
语种	英语
scopus关键词	atmospheric dynamics; climate modeling; computer simulation; radiative forcing; seasonal variation; spatiotemporal analysis; stratosphere; teleconnection; Siberia
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145543
作者单位	Group of Meteorology, Universitat de Barcelona (UB), Barcelona, Spain; Barcelona Supercomputing Center (BSC), Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
推荐引用方式 GB/T 7714	Palmeiro F.M.,García-Serrano J.,Bellprat O.,et al. Boreal winter stratospheric variability in EC-EARTH: High-Top versus Low-Top[J],2020,54.
APA	Palmeiro F.M.,García-Serrano J.,Bellprat O.,Bretonnière P.-A.,&Doblas-Reyes F.J..(2020).Boreal winter stratospheric variability in EC-EARTH: High-Top versus Low-Top.Climate Dynamics,54.
MLA	Palmeiro F.M.,et al."Boreal winter stratospheric variability in EC-EARTH: High-Top versus Low-Top".Climate Dynamics 54(2020).