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Atmosphere 2018, 9(6), 229;

Influences of the North Pacific Victoria Mode on the South China Sea Summer Monsoon

State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
College of Global Change and Earth System Sciences (GCESS), Beijing Normal University, Beijing 100875, China
Institute of Oceanography, National Taiwan University, Taipei 10617, Taiwan
Author to whom correspondence should be addressed.
Received: 10 May 2018 / Revised: 31 May 2018 / Accepted: 5 June 2018 / Published: 13 June 2018
(This article belongs to the Special Issue Monsoons)
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Using the reanalysis data and the numerical experiments of a coupled general circulation model (CGCM), we illustrated that perturbations in the second dominant mode (EOF2) of springtime North Pacific sea surface temperature (SST) variability, referred to as the Victoria mode (VM), are closely linked to variations in the intensity of the South China Sea summer monsoon (SCSSM). The underlying physical mechanism through which the VM affects the SCSSM is similar to the seasonal footprinting mechanism (SFM). Thermodynamic ocean–atmosphere coupling helps the springtime SST anomalies in the subtropics associated with the VM to persist into summer and to develop gradually toward the equator, leading to a weakened zonal SST gradient across the western North Pacific (WNP) to central equatorial Pacific, which in turn induces an anomalous cyclonic flow over the WNP and westerly anomalies in the western equatorial Pacific that tend to strengthen the WNP summer monsoon (WNPSM) as well as the SCSSM. The VM influence on both the WNPSM and SCSSM is intimately tied to its influence on ENSO through westerly anomalies in the western equatorial Pacific. View Full-Text
Keywords: Victoria mode; South China Sea summer monsoon; ENSO Victoria mode; South China Sea summer monsoon; ENSO

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Ding, R.; Li, J.; Tseng, Y.-H.; Li, L.; Sun, C.; Xie, F. Influences of the North Pacific Victoria Mode on the South China Sea Summer Monsoon. Atmosphere 2018, 9, 229.

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