气候变化领域集成服务门户(CCPortal): Dominant patterns of winter-time intraseasonal surface air temperature over the CONUS in response to MJO convections

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DOI	10.1007/s00382-019-04760-x
	Dominant patterns of winter-time intraseasonal surface air temperature over the CONUS in response to MJO convections
	Hu W.; Liu P.; Zhang Q.; He B.
发表日期	2019
ISSN	0930-7575
起始页码	3917
结束页码	3936
卷号	53 期号:2020-07-08
英文摘要	The dominant patterns of the intraseasonal surface air temperature (SAT) over the Contiguous United States (CONUS) during wintertime (December–March) are investigated in the period of 1979–2014 in the present study. The first two leading modes revealed by the empirical orthogonal function (EOF) analysis sufficiently represent the patterns by explaining nearly 80% of the total variance. The EOF1 mode has a monopole pattern with large loadings in the central-north CONUS, while the EOF2 has a dipole pattern with loadings of opposing signs in the northwestern and southeastern CONUS. The monopole pattern of the EOF1 has a significant lead-lag correlation with the EOF2 dipole pattern. These dominant patterns are traced back to the convective anomalies of the Madden–Julian Oscillation (MJO) which has eight phases characterized by the revised real-time multivariate MJO index. The connections are established dynamically by Rossby wave trains propagating from the MJO convections to North America. Specifically, the monopole warming (EOF1) is well developed by lagging about two pentads from enhanced MJO convections during phase 4 over the Maritime Continent as the wave sources. The dipole pattern (EOF2) of “warm-West/cool-East” starts to develop during MJO phase 7 with enhanced convections over the Western Pacific and reaches a maximum about two pentads later. Such dynamic lead-lag relationships on intraseasonal time scales are revealed by both diagnostic analysis and numerical experiments using a linear baroclinic model, which are potentially useful for predicting intraseasonal variations in SAT over the CONUS. © 2019, The Author(s).
英文关键词	CONUS surface temperature; Intraseasonal variations; MJO; Wintertime
语种	英语
scopus关键词	air temperature; atmospheric convection; empirical orthogonal function analysis; Madden-Julian oscillation; seasonal variation; surface temperature; winter; United States
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/146000
作者单位	State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States; Climate Prediction Center, NCEP/NWS/NOAA, College Park, MD, United States
推荐引用方式 GB/T 7714	Hu W.,Liu P.,Zhang Q.,et al. Dominant patterns of winter-time intraseasonal surface air temperature over the CONUS in response to MJO convections[J],2019,53(2020-07-08).
APA	Hu W.,Liu P.,Zhang Q.,&He B..(2019).Dominant patterns of winter-time intraseasonal surface air temperature over the CONUS in response to MJO convections.Climate Dynamics,53(2020-07-08).
MLA	Hu W.,et al."Dominant patterns of winter-time intraseasonal surface air temperature over the CONUS in response to MJO convections".Climate Dynamics 53.2020-07-08(2019).