Impacts of the Madden-Julian Oscillation on South China Sea Monsoon

2021 ◽  
Author(s):  
Qun ZHOU ◽  
Lixin Wei
Keyword(s):  
South China Sea ◽  
South China ◽  
Madden Julian Oscillation ◽  
China Sea ◽  
South China Sea Monsoon

Impacts of the Madden-Julian Oscillation on South China Sea Monsoon

2020 ◽  
Author(s):  
Qun Zhou ◽  
Lixin Wei
Keyword(s):  
South China Sea ◽  
South China ◽  
Meridional Circulation ◽  
East Asian ◽  
Winter Monsoon ◽  
Western Pacific ◽  
Madden Julian Oscillation ◽  
China Sea ◽  
The Western Pacific ◽  
Local Meridional Circulation

Abstract It is of great practical importance to understand the variability of the South China Sea (SCS) monsoon on intraseasonal time scales, since the anomalous enhancement of the SCS monsoon may exert serious impacts on the safety of offshore engineering and marine transportation. Our composite analysis shows that the SCS surface wind anomalies are considerably varying with the Madden-Julian Oscillation (MJO) eastward propagation. The SCS summer southwest monsoon tends to be stronger (weaker) in phases 5–8 (1–4) of MJO with the largest positive (negative) wind-speed anomalies when the MJO convection is centered in the western Pacific (far western Indian Ocean), suggesting the highest (lowest) probability of the gale over the SCS. The variation of the western Pacific Subtropical High (WPSH), induced by the variations of the local meridional circulation, is shown to play a crucial role in the MJO-SCS summer monsoon linkage. The SCS winter monsoon is also shown to be modulated by the MJO with strengthened (weakened) surface northeasterly in phases 5–6 (1–2). The extra-tropical East Asian trough and East Asian westerly jet associated with the local meridional circulation can well explain the changes of the MJO-SCS winter monsoon relationship. The opposite responses of the wind direction during the same phases of the MJO between summer and winter may be attributed to the discrepancy of meridional circulation related to the wintertime equatorward shift of the MJO convection. The present study indicates that the MJO could be taken into consideration when applying extended-range weather forecast over the SCS as the predictability of the MJO activity is up to 15–20 day currently.

The south china sea monsoon experiment (scsmex) implementation plan

1997 ◽  
Vol 14 (2) ◽  
pp. 255-270 ◽  
Author(s):  
Ding Yihui ◽  
Chao Qingchen ◽  
Zhang Yan ◽  
Gan Zijun ◽  
Zhang Xiuzhi
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
Implementation Plan ◽  
China Sea ◽  
South China Sea Monsoon

An ensemble forecast of the South China Sea monsoon

1999 ◽  
Vol 16 (2) ◽  
pp. 159-182 ◽  
Author(s):  
T. N. Krishnamurti ◽  
Mukul Tewari ◽  
Ed Bensman ◽  
Wei Han ◽  
Zhan Zhang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Ensemble Forecast ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
South China Sea Monsoon

scholarly journals Impacts of the Madden–Julian Oscillation on the Summer South China Sea Ocean Circulation and Temperature

2013 ◽  
Vol 26 (20) ◽  
pp. 8084-8096 ◽  
Author(s):  
Guihua Wang ◽  
Zheng Ling ◽  
Renguang Wu ◽  
Changlin Chen
Keyword(s):  
South China Sea ◽  
Ocean Circulation ◽  
South China ◽  
Ocean Model ◽  
Ocean Modeling ◽  
Madden Julian Oscillation ◽  
Regional Ocean Modeling System ◽  
Wind Stress Curl ◽  
China Sea ◽  
The Impact

Abstract The present study investigates the impact of the Madden–Julian oscillation (MJO) on the South China Sea (SCS) in summer with three types of models: a theoretical Sverdrup model, a 1.5-layer reduced gravity model, and a regional ocean model [Regional Ocean Modeling System (ROMS)]. Results show that the ocean circulation in the SCS has an intraseasonal oscillation responding to the MJO. During its westerly phase, the MJO produces positive (negative) wind stress curl over the northern (southern) SCS and thus induces an enhanced cyclonic (anticyclonic) circulation in the northern (southern) SCS. This not only cools sea surface temperature (SST) but also decreases (increases) subsurface temperature in the northern (southern) SCS. During its easterly phase, the MJO basically produces a reversed but weaker influence on SCS ocean circulation and temperature. Thus, the MJO can have an imprint on the summer climatology of SCS circulation and temperature. The authors' analysis further indicates that the MJO's dynamic effect associated with wind is generally more important than its thermodynamic effect in modulating the regional ocean circulation and temperature. The present study suggests that the MJO is important for summer ocean circulation and temperature in the SCS.

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