DOI: 10.1007/s00382-016-3021-y
Scopus记录号: 2-s2.0-84957628689
论文题名: Interdecadal modulation of ENSO-related spring rainfall over South China by the Pacific Decadal Oscillation
作者: Wu X. ; Mao J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-09-10 起始页码: 3203
结束页码: 3220
语种: 英语
英文关键词: Coupled model simulation
; ENSO
; Interdecadal modulation
; Pacific Decadal Oscillation
; South China spring rainfall
英文摘要: The interdecadal modulation of the relationship between El Niño–Southern Oscillation (ENSO) and the South China spring rainfall (SCSR) by the Pacific Decadal Oscillation (PDO) is investigated using long-term observational datasets. When ENSO and PDO are in-phase [i.e., El Niño events during warm PDO (EN_WPDO) and La Niña events during cold PDO (LN_CPDO)], the positive correlations between ENSO and SCSR are enhanced significantly, with above-normal (below-normal) SCSR generally following EN_WPDO (LN_CPDO) events. In contrast, the ENSO–SCSR relationship becomes ambiguous when ENSO and PDO are out-of-phase [i.e., El Niño events during cold PDO (EN_CPDO) and La Niña events during warm PDO (LN_WPDO)]. The PDO modulates the ENSO–SCSR relationship through the impact of variations in the lower-tropospheric subtropical anticyclone over the western North Pacific (WNP) and upper-tropospheric westerly jets over East Asia and the midlatitude North Pacific. An EN_WPDO (LN_CPDO) event induces an enhanced subtropical anticyclone (cyclone) over the WNP and intensified (weakened) subtropical westerly jet around the southern Tibetan Plateau due to modification by the PDO-forced anomalous circulation. Thus, South China falls just under the influence of the anomalous lower-tropospheric southwesterlies (northeasterlies) and upper-tropospheric divergent (convergent) environment, leading to above-normal (below-normal) SCSR. In contrast, the SCSR anomalies exhibit no wet or dry preference following EN_CPDO (LN_CPDO) events, because ENSO-induced and PDO-forced circulation anomalies tend to cancel each other out. These modulating effects by the PDO on the ENSO–SCSR relationship and related physical processes are also examined with coupled model simulations. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53461
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, Beijing, China; Joint Center for Global Change Studies, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Wu X.,Mao J.. Interdecadal modulation of ENSO-related spring rainfall over South China by the Pacific Decadal Oscillation[J]. Climate Dynamics,2016-01-01,47(2017-09-10)