气候变化领域集成服务门户(CCPortal): Simulating the Antarctic stratospheric vortex transport barrier: comparing the Unified Model to reanalysis

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DOI	10.1007/s00382-018-4593-5
	Simulating the Antarctic stratospheric vortex transport barrier: comparing the Unified Model to reanalysis
	Cameron C.; Bodeker G.E.; Conway J.P.; Stuart S.; Renwick J.
发表日期	2019
ISSN	0930-7575
起始页码	441
结束页码	452
卷号	53 期号:2020-01-02
英文摘要	An assessment has been made of the ability of the UK Met Office Unified Model (UM) to simulate the Antarctic stratospheric circumpolar vortex and, in particular, the extent to which the vortex acts as a barrier to meridional transport. It is important that models simulate this barrier well as it determines spatial gradients in radiatively active gases, such as ozone, which then determine the spatial morphology of the radiative forcing field. The assessment was made by comparing metrics of meridional impermeability calculated from dynamical fields extracted from UM simulations and from analogous fields obtained from NCEP-CFSR reanalysis. Two different UM configurations were assessed: global atmosphere 3.0 (GA3.0) using the New Dynamics dynamical core, and GA7.0 using the newer ENDGame dynamical core, with both versions run at N96 resolution (1.25∘ latitude by 1.875∘ longitude). The GA7.0 configuration appears to better simulate the dynamical isolation of the Antarctic stratospheric vortex in the lower stratosphere up to about 600 K, while GA3.0 provides a better simulation in the upper stratosphere. However, neither UM configuration simulates the same degree of dynamical isolation suggested by the reanalysis. In particular the UM configurations produce a wider and more poleward meridional band of high wind-speed and steep PV gradients when compared with the NCEP-CFSR reanalysis, leading to a stronger barrier in GA7.0 and a weaker barrier in GA3.0. Possible causes of discrepancies between model simulations and reanalysis and between the two model configurations are discussed. It is pointed out that further work is needed to identify ways of resolving these discrepancies in model simulations. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Antarctic stratospheric circumpolar vortex; Climate change; Dynamical isolation; Global climate models; Meridional impermeability; NCEP-CFSR reanalysis; Ozone hole; Unified Model
语种	英语
scopus关键词	climate change; climate modeling; computer simulation; global climate; meridional circulation; stratosphere; vortex; Antarctica
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/146191
作者单位	Bodeker Scientific, 42 Russell St., Alexandra, New Zealand; NIWA, Private Bag 14901, Wellington, New Zealand; Victoria University of Wellington, PO Box 600, Wellington, New Zealand
推荐引用方式 GB/T 7714	Cameron C.,Bodeker G.E.,Conway J.P.,et al. Simulating the Antarctic stratospheric vortex transport barrier: comparing the Unified Model to reanalysis[J],2019,53(2020-01-02).
APA	Cameron C.,Bodeker G.E.,Conway J.P.,Stuart S.,&Renwick J..(2019).Simulating the Antarctic stratospheric vortex transport barrier: comparing the Unified Model to reanalysis.Climate Dynamics,53(2020-01-02).
MLA	Cameron C.,et al."Simulating the Antarctic stratospheric vortex transport barrier: comparing the Unified Model to reanalysis".Climate Dynamics 53.2020-01-02(2019).