DOI: 10.1007/s00382-017-3692-z
Scopus记录号: 2-s2.0-85018853826
论文题名: PDO modulation of the ENSO impact on the summer South Asian high
作者: Xue X. ; Chen W. ; Chen S. ; Feng J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-03-04 起始页码: 1393
结束页码: 1411
语种: 英语
英文关键词: ENSO
; PDO
; SAH-ENSO relationship
; South Asian high
; Tropical Indian Ocean SST
Scopus关键词: climatology
; El Nino-Southern Oscillation
; heat flux
; Pacific Decadal Oscillation
; sea surface temperature
; summer
; Walker circulation
; Indian Ocean
; Indian Ocean (East)
; Indian Ocean (Tropical)
英文摘要: This study investigates modulation effects of the Pacific decadal oscillation (PDO) on the impact of boreal winter El Niño–Southern Oscillation (ENSO) on the South Asian high (SAH) variability in the following summer. In the El Niño together with positive PDO (EL/+PDO) or the La Niña together with negative PDO (LA/−PDO) years, boreal winter ENSO can influence the following summer SAH activity significantly. The SAH tends to be obviously strengthened (weakened) and located further south (north) during EL/+PDO (LA/−PDO). However, in the El Niño together with negative PDO (EL/−PDO) or the La Niña together with positive PDO (LA/+PDO) years, the influence of ENSO on the SAH tends to be weak. The strength and location of SAH are close to those in the climatology of 1950–2011 during the EL/−PDO or the LA/+PDO. Further analysis indicates that the PDO could exert pronounced influence on the ENSO-SAH connection via modulating the anomalous Walker circulation and charge effect over the tropical Indian Ocean (TIO). During the EL/+PDO or LA/−PDO, the anomalous Walker circulation associated with El Niño or La Niña is stronger and lasts for a longer time than those during the EL/−PDO or LA/+PDO. This leads to stronger descending (ascending) motion over the Maritime Continent and easterly (westerly) wind anomalies over the eastern Indian Ocean in the EL/+PDO (LA/−PDO), which further exert larger effects on the surface heat fluxes and subsurface ocean dynamical heating process over the Indian Ocean. As such, the induced warm (cold) sea surface temperature anomalies over the Indian Ocean are more significant and larger in the EL/+PDO (LA/−PDO). These larger sea surface temperature anomalies over the TIO could exert a more significant influence on the tropospheric temperature via moisture adjustment, which subsequently results in stronger SAH variability in the EL/+PDO or the LA/−PDO. © 2017, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109440
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Ecosystem, College of Life Science, Guizhou University, Guiyang, Guizhou Province 550025, China; Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100190, China; School of Earth Science, University of the Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Xue X.,Chen W.,Chen S.,et al. PDO modulation of the ENSO impact on the summer South Asian high[J]. Climate Dynamics,2018-01-01,50(2018-03-04)