DOI: 10.1002/2014GL060711
论文题名: A physical mechanism of the precipitation dipole in the western United States based on PDO-storm track relationship
作者: Sung M.-K. ; An S.-I. ; Kim B.-M. ; Woo S.-H.
刊名: Geophysical Research Letters
ISSN: 0094-10018
EISSN: 1944-9749
出版年: 2014
卷: 41, 期: 13 起始页码: 4719
结束页码: 4726
语种: 英语
英文关键词: ENSO
; PDO
; precipitation dipole
Scopus关键词: Atmospheric pressure
; Climatology
; Modulation
; Baroclinicity
; ENSO
; Pacific decadal oscillation
; PDO
; Physical mechanism
; Teleconnections
; Track mechanism
; Western United States
; Storms
英文摘要: It is known that the western United States (US) precipitation displays a north-south contrast, i.e., the so-called "precipitation dipole," during El Niño and La Niña winters. Furthermore, the Pacific Decadal Oscillation (PDO) has been known to modulate this precipitation dipole. However, the underlying physical mechanism regulating this modulation is not well understood. This study revisits previous studies and suggests a physical mechanism of precipitation dipole modulation based on the PDO-storm track relationship. We found that both jet stream and storm track tend to move northward (southward) over the North Pacific during negative (positive) PDO winters, contributing to the increase of precipitation over the northwestern (southwestern) US, respectively. This relationship is robust regardless of El Niño-Southern Oscillation (ENSO), possibly facilitating modulation of the precipitation dipole. Moreover, changes in oceanic baroclinicity associated with the PDO phase are suggested to be responsible for anchorage of storm tracks over the North Pacific. Key Points Why we have a high correlation between the PDO and precipitation dipole PDO-storm track mechanism as an explanation to the precipitation dipole PDO-storm track relationship is robust regardless of ENSO teleconnection ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904083537&doi=10.1002%2f2014GL060711&partnerID=40&md5=51f4132cf5e869cb83a161ced67a257b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7282
Appears in Collections: 气候减缓与适应
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作者单位: Korea Polar Research Institute, Incheon, South Korea
Recommended Citation:
Sung M.-K.,An S.-I.,Kim B.-M.,et al. A physical mechanism of the precipitation dipole in the western United States based on PDO-storm track relationship[J]. Geophysical Research Letters,2014-01-01,41(13).