气候变化领域集成服务门户(CCPortal): The influence of South American regional climate on the simulation of the Southern Hemisphere extratropical circulation

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DOI	10.1007/s00382-019-04940-9
	The influence of South American regional climate on the simulation of the Southern Hemisphere extratropical circulation
	Falco M.; Li L.Z.X.; Menéndez C.G.; Carril A.F.
发表日期	2019
ISSN	0930-7575
起始页码	6469
结束页码	6488
卷号	53 期号:2020-09-10
英文摘要	This paper presents new modeling evidence showing the added value of high-resolution information from South America (SA) in the simulation of the Southern Hemisphere (SH) extratropical circulation. LMDZ, a coarse-resolution atmospheric global general circulation model constitutes the main tool for this investigation. Parallel to the control simulation, a two-way nesting (TWN) simulation of LMDZ is performed with an interactive coupling to the same model, but with a higher-resolution zoom over SA. The third simulation is a perfect boundary simulation for which re-analysis information from ERA-Interim is used to nudge LMDZ, but only over SA. Results indicate that enhanced resolution over SA improves the representation of the most important processes that influence extratropical eddy activity. The local improvement is followed by a better representation of the global extratropical circulation, especially in austral summer. The regional climate enhancement over SA has positive effects on simulation of the midlatitude jet position during the austral summer by significantly reducing the bias of the mean zonal kinetic energy outside the nudged zone. On the other hand, the wintertime general circulation outside the nudged-zone shows a limited bias-reduction for the regional-driven simulations, especially in the case of the TWN system. However, improvements of the TWN system compared to the control experiment are noticed in early stages of cyclone lifecycle, as it is identified in a better simulation of transient meridional heat transport and transient kinetic energy intensity. The findings of the present study suggest, thus, that improvements in resolution over SA effectively excite the simulation of the mean atmospheric circulation in the SH. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Extratropical circulation; Influence of South American regional climate; Southern Hemisphere; Two-way nesting system
语种	英语
scopus关键词	atmospheric circulation; climate modeling; computer simulation; extratropical cyclone; kinetic energy; mesoscale eddy; regional climate; Southern Hemisphere; South America
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/145851
作者单位	Centro de Investigaciones del Mar y la Atmósfera (CIMA), CONICET-UBA, Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, Int. Guiraldes 2160, Pabellón 2, Piso 2, Buenos Aires, C1428EGA, Argentina; Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos (UMI3351-IFAECI/CNRS-CONICET-UBA), Buenos Aires, Argentina; Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina; Laboratoire de Météorologie Dynamique (LMD), CNRS, Sorbonne Université, École Normale Supérieure, École Polytechnique, Paris, France
推荐引用方式 GB/T 7714	Falco M.,Li L.Z.X.,Menéndez C.G.,et al. The influence of South American regional climate on the simulation of the Southern Hemisphere extratropical circulation[J],2019,53(2020-09-10).
APA	Falco M.,Li L.Z.X.,Menéndez C.G.,&Carril A.F..(2019).The influence of South American regional climate on the simulation of the Southern Hemisphere extratropical circulation.Climate Dynamics,53(2020-09-10).
MLA	Falco M.,et al."The influence of South American regional climate on the simulation of the Southern Hemisphere extratropical circulation".Climate Dynamics 53.2020-09-10(2019).