气候变化领域集成服务门户(CCPortal): Effects of Topography and Realistic Drag on the Southern Hemisphere Midlatitude Jet in a Dry Model

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DOI	10.1029/2019MS001717
	Effects of Topography and Realistic Drag on the Southern Hemisphere Midlatitude Jet in a Dry Model
	Pithan F.; Polichtchouk I.
发表日期	2020
ISSN	19422466
卷号	12 期号:3
英文摘要	Climate models have substantial biases in the climatological latitude of the Southern Hemisphere eddy-driven jet and the time scale of annular mode variability and disagree on the jet response to climate change. Zonally symmetric dry dynamical cores are often used for idealized modeling of the jet response to forcing and its sensitivity to model setup changes. The limits to which these models represent the key mechanisms that control the jet in complex models or the real world have not been systematically investigated. Here we show that substantial intermodel differences in jet latitude and strength can arise from differences in dynamical cores and resolved topography. Including topography and a more realistic surface drag in a dry model substantially alters the jet response to changes in drag strength. Using real-world maps, enhanced drag over land shifts the jet poleward, whereas enhanced drag over the ocean leads to an equatorward shift. No universal relationship between annular mode time scale and forced response emerges in the dry model with topography. These results suggest that zonally symmetric models with Rayleigh drag lack important mechanisms that control the behavior of the midlatitude jet in coupled climate models. A dry model with topography and quadratic surface drag can fill this gap in the model hierarchy. © 2020. The Authors.
英文关键词	drag; dynamical core; eddy-driven jet; idealized models; topography
语种	英语
scopus关键词	Climate change; Drag; Maps; Topography; Coupled climate model; Dynamical core; Equatorward shift; Idealized models; Quadratic surfaces; Southern Hemisphere; Symmetric model; Universal relationship; Climate models; Arctic Oscillation; climate modeling; drag; eddy; environmental modeling; jet; midlatitude environment; Southern Hemisphere; topographic effect
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156752
作者单位	Alfred Wegener Institut, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
推荐引用方式 GB/T 7714	Pithan F.,Polichtchouk I.. Effects of Topography and Realistic Drag on the Southern Hemisphere Midlatitude Jet in a Dry Model[J],2020,12(3).
APA	Pithan F.,&Polichtchouk I..(2020).Effects of Topography and Realistic Drag on the Southern Hemisphere Midlatitude Jet in a Dry Model.Journal of Advances in Modeling Earth Systems,12(3).
MLA	Pithan F.,et al."Effects of Topography and Realistic Drag on the Southern Hemisphere Midlatitude Jet in a Dry Model".Journal of Advances in Modeling Earth Systems 12.3(2020).