气候变化领域集成服务门户(CCPortal): How far poleward can the seasonal precipitation maxima over land extend under high obliquity?

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DOI	10.1007/s00382-020-05225-2
	How far poleward can the seasonal precipitation maxima over land extend under high obliquity?
	Han J.; Back L.E.; Liu Z.; Wen X.
发表日期	2020
ISSN	0930-7575
起始页码	4211
结束页码	4232
卷号	54
英文摘要	The seasonal response of the poleward extent of continental precipitation maxima to high obliquity and its controlling mechanisms are examined using the NCAR-CESM and Budyko-Sellers energy balance model. In CESM, the latitude of the poleward-most continental precipitation maximum (denoted as ϕmp) migrates poleward with increased obliquity, but is limited to equatorward of the latitude of maximum daily insolation. Some insight is gained on the controlling mechanism of the migration of ϕmp in the Budyko–Sellers model, assuming ϕmp coinciding with the position of maximum surface moist static energy (denoted as Θ mp) as in the present-day observation and CESM pre-industrial simulation. Heat capacity exerts a primary control on ϕmp such that ϕmp is determined by the position of maxima of accumulated insolation over the radiative relaxation time and therefore lies equatorward of the maximum daily insolation. Variations of surface albedo and horizontal heat transport, as secondary effects, further shift the ϕmp. This understanding from the Budyko-Sellers model, however, fails in CESM in the case of high obliquity of 40°, with ϕmp now lying equatorward of Θ mp. This separation between ϕmp and Θ mp is explained by the constraint of rotation on the latitudinal range of weak temperature gradients, which is the prerequisite for the prediction of ϕmp from Θ mp. When the rotation rate is reduced, the latitudinal range of weak temperature gradients expands poleward roughly following the change of the equatorial Rossby radius, allowing ϕmp moving close to Θ mp. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	CGCM; Diffusive energy balance model; High obliquity; Poleward migration; Seasonal land precipitation; Surface moist static energy
语种	英语
scopus关键词	climate modeling; heat transfer; insolation; obliquity; precipitation (climatology); seasonal variation; thermodynamics
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/145480
作者单位	Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China; University of Wisconsin-Madison, Madison, WI, United States; The Ohio State University, 154 N. Oval Mall, Columbus, OH 43210, United States
推荐引用方式 GB/T 7714	Han J.,Back L.E.,Liu Z.,et al. How far poleward can the seasonal precipitation maxima over land extend under high obliquity?[J],2020,54.
APA	Han J.,Back L.E.,Liu Z.,&Wen X..(2020).How far poleward can the seasonal precipitation maxima over land extend under high obliquity?.Climate Dynamics,54.
MLA	Han J.,et al."How far poleward can the seasonal precipitation maxima over land extend under high obliquity?".Climate Dynamics 54(2020).