气候变化领域集成服务门户(CCPortal): Plausible causes of the interdecadal change of the North Pacific teleconnection pattern in boreal spring around the late 1990s

CCPortal

DOI	10.1007/s00382-020-05334-y
	Plausible causes of the interdecadal change of the North Pacific teleconnection pattern in boreal spring around the late 1990s
	Guo Y.; Wen Z.; Tan Y.; Li X.
发表日期	2020
ISSN	0930-7575
起始页码	1427
结束页码	1442
卷号	55
英文摘要	An interdecadal change of the North Pacific teleconnection pattern in the upper troposphere in boreal spring was noted around the late 1990s. During the period of 1979–1998, a meridional dipole pattern with alternative cyclone and anticyclone to the south and the north of 45° N over North Pacific, was identified as the leading mode by applying the empirical orthogonal function (EOF) technique onto the 300-hPa geopotential height anomaly after removing its zonal average. This pattern is similar to the upper-tropospheric structure of North Pacific Oscillation (NPO)/western Pacific (WP) pattern. During the period of 1999–2018, the meridional dipole is replaced by a northeast–southwest orientated teleconnection with centers of activity over the subtropical central Pacific and northeastern North Pacific, resembling a Pacific-North America (PNA) teleconnection. That is, the upper-level atmospheric teleconnection shifted from a NPO/WP-like pattern to a PNA-like pattern in 1998/1999. For the plausible causes of this interdecadal change, the effect of synoptic high-frequency (HF, 2–8 day) eddy and tropical convection over the central Pacific are emphasized. Before 1998/1999, the NPO/WP-like teleconnection could be ascribed to the vorticity forcing of the HF transient eddy activity over North Pacific between 40° and 60° N, with the role of tropical heating ignorable. After 1998/1999, the spatial distribution of HF transient eddy activity shifted significantly from a north–south pattern to a northeast–southwest pattern, sustaining a PNA-like teleconnection through the transportation of the eddy vorticity fluxes, while the vorticity forcing of the subseasonal low-frequency (LF, 10–90 day) transient eddy activity plays a role in the maintenance of the teleconnection lobe over the subtropical central Pacific. In addition, the tropical convection anomaly centers shifted towards the equatorial central Pacific and Maritime Continent, which can induce a poleward-propagating Rossby wave train, and amplify the PNA-like teleconnection pattern. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	decadal variation; Rossby wave; spring (season); teleconnection; troposphere; vorticity; North America; Pacific Ocean; Pacific Ocean (Central); Pacific Ocean (North); Pacific Ocean (West)
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/145361
作者单位	Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai, 200438, China; Innovation Center of Ocean and Atmosphere System, Zhuhai Fudan Innovation Research Institute, Zhuhai, China; Jiangsu Collaborative Innovation Center for Climate Change, Nanjing, China; Center for Monsoon and Environment Research and School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
推荐引用方式 GB/T 7714	Guo Y.,Wen Z.,Tan Y.,et al. Plausible causes of the interdecadal change of the North Pacific teleconnection pattern in boreal spring around the late 1990s[J],2020,55.
APA	Guo Y.,Wen Z.,Tan Y.,&Li X..(2020).Plausible causes of the interdecadal change of the North Pacific teleconnection pattern in boreal spring around the late 1990s.Climate Dynamics,55.
MLA	Guo Y.,et al."Plausible causes of the interdecadal change of the North Pacific teleconnection pattern in boreal spring around the late 1990s".Climate Dynamics 55(2020).