气候变化领域集成服务门户(CCPortal): How does the quasi-biennial oscillation affect the boreal winter tropospheric circulation in cmip5/6 models?

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DOI	10.1175/JCLI-D-20-0024.1
	How does the quasi-biennial oscillation affect the boreal winter tropospheric circulation in cmip5/6 models?
	Jian R.A.O.; Garfinkel C.I.; White I.P.
发表日期	2020
ISSN	0894-8755
起始页码	8975
结束页码	8996
卷号	33 期号:20
英文摘要	Using 17 CMIP5 and CMIP6 models with a spontaneously generated quasi-biennial oscillation (QBO)-like phenomenon, this study explores and evaluates three dynamical pathways for impacts of the QBO on the troposphere: 1) the Holtan-Tan (HT) effect on the stratospheric polar vortex and the northern annular mode (NAM), 2) the subtropical zonal wind downward arching over the Pacific, and 3) changes in local convection over the Maritime Continent and Indo-Pacific Ocean. More than half of the models can reproduce at least one of the three pathways, but few models can reproduce all of the three routes. First, seven models are able to simulate a weakened polar vortex during easterly QBO (EQBO) winters, in agreement with the HT effect in the reanalysis. However, the weakened polar vortex response during EQBO winters is underestimated or not present at all in other models, and hence the chain for QBO, vortex, and tropospheric NAM/AO is not simulated. For the second pathway associated with the downward arching of the QBO winds, 10 models simulate an inconsistent extratropical easterly anomaly center over 208-408N in the Pacific sector during EQBO, and hence the negative relative vorticity anomalies poleward of the easterly center is not present in those models, leading to no consensus on the height response over the North Pacific between those models and the reanalysis. However, the other seven models do capture this effect. The third pathway is only observed in the Indo-Pacific Ocean, where the strong climatological deep convection and the warm pool are situated. Seven models can simulate the convection anomalies associated with the QBO over the Maritime Continent, which is likely caused by the near-tropopause low buoyancy frequency anomalies. No robust relationship between the QBO and El Niño-Southern Oscillation (ENSO) events can be established using the JRA55 reanalysis, and 10 models consistently confirm little modulation of the ocean basinwide Walker circulation and ENSO events by the QBO. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric pressure; Climate models; Oceanography; Oscillators (mechanical); Troposphere; Vortex flow; Buoyancy frequency; Maritime Continent; Northern annular mode; Quasi-biennial oscillation; Relative vorticity; Southern oscillation; Stratospheric polar vortex; Tropospheric circulation; Climatology; climate modeling; CMIP; Northern Hemisphere; seasonal variation; stratosphere-troposphere interaction; zonal wind; Pacific Ocean
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171531
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Fredy and Nadine Herrmann Institute of Earth Sciences, Hebrew University of Jerusalem, Givat Ram, Jerusalem, Israel
推荐引用方式 GB/T 7714	Jian R.A.O.,Garfinkel C.I.,White I.P.. How does the quasi-biennial oscillation affect the boreal winter tropospheric circulation in cmip5/6 models?[J],2020,33(20).
APA	Jian R.A.O.,Garfinkel C.I.,&White I.P..(2020).How does the quasi-biennial oscillation affect the boreal winter tropospheric circulation in cmip5/6 models?.Journal of Climate,33(20).
MLA	Jian R.A.O.,et al."How does the quasi-biennial oscillation affect the boreal winter tropospheric circulation in cmip5/6 models?".Journal of Climate 33.20(2020).