气候变化领域集成服务门户(CCPortal): Evidence for Coupling Between the Subseasonal Oscillations in the Southern Hemisphere Midlatitude Ocean and Atmosphere

CCPortal

DOI	10.1029/2020JD033872
	Evidence for Coupling Between the Subseasonal Oscillations in the Southern Hemisphere Midlatitude Ocean and Atmosphere
	Xue D.; Lu J.; Qian Y.; Zhang Y.
发表日期	2021
ISSN	2169897X
卷号	126 期号:4
英文摘要	A regional perspective is taken to investigate the intriguing ∼25-day periodicity in the Southern Hemisphere (SH) baroclinic annular mode (BAM) and the possible underlying mechanisms. Results show that the 25-day periodicity exists not only in the zonal average but also in the regional average of eddy activity as long as the domain of the average is wide enough to accommodate a wave packet. The favorable domain for the ∼25 days periodicity is located downstream of the largest baroclinicity in midlatitudes. The wave activity developed there can travel circumglobally several times with a typical group velocity of 25 m s−1, and reenter the domain every 12.5 days, setting the base periodicity. A slower oceanic oscillation at a time scale of ∼100 days in the same region appears to select and reinforce the multiples of 12.5 days, giving rise to a pronounced ∼25-day periodicity in the wave activity. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	BAM; delayed oscillator; intraseasonal prediction; wave packets
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185464
作者单位	Department of Meteorology, School of Atmospheric Sciences, Nanjing University, Nanjing, China; Atmospheric Science and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States
推荐引用方式 GB/T 7714	Xue D.,Lu J.,Qian Y.,et al. Evidence for Coupling Between the Subseasonal Oscillations in the Southern Hemisphere Midlatitude Ocean and Atmosphere[J],2021,126(4).
APA	Xue D.,Lu J.,Qian Y.,&Zhang Y..(2021).Evidence for Coupling Between the Subseasonal Oscillations in the Southern Hemisphere Midlatitude Ocean and Atmosphere.Journal of Geophysical Research: Atmospheres,126(4).
MLA	Xue D.,et al."Evidence for Coupling Between the Subseasonal Oscillations in the Southern Hemisphere Midlatitude Ocean and Atmosphere".Journal of Geophysical Research: Atmospheres 126.4(2021).