Indo-Pacific remote forcing in summer rainfall variability over the South China Sea

2014 ◽  
Vol 42 (9-10) ◽  
pp. 2323-2337 ◽  
Author(s):  
Zhuoqi He ◽  
Renguang Wu
Keyword(s):  
South China Sea ◽  
South China ◽  
Rainfall Variability ◽  
Summer Rainfall ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Remote Forcing

Signals of the South China Sea summer rainfall variability in the Indian Ocean

2015 ◽  
Vol 46 (9-10) ◽  
pp. 3181-3195 ◽  
Author(s):  
Zhuoqi He ◽  
Renguang Wu ◽  
Weiqiang Wang
Keyword(s):  
Indian Ocean ◽  
South China Sea ◽  
South China ◽  
Rainfall Variability ◽  
Summer Rainfall ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
The Indian Ocean

Tropical Cyclone– and Monsoon-Induced Rainfall Variability in Taiwan

2010 ◽  
Vol 23 (15) ◽  
pp. 4107-4120 ◽  
Author(s):  
Jau-Ming Chen ◽  
Tim Li ◽  
Ching-Feng Shih
Keyword(s):  
Tropical Cyclone ◽  
South China Sea ◽  
South China ◽  
Rainfall Variability ◽  
The South China Sea ◽  
Upward Motion ◽  
The South ◽  
Total Rainfall ◽  
China Sea ◽  
Anomalous Cyclone

Abstract This study investigates the interannual variability of tropical cyclone (TC)- and monsoon-induced rainfall (P) in Taiwan during July–September for the period 1950–2002. To examine the relative effects of TCs and monsoons, local rainfall in Taiwan is separated into two subcomponents: TC rainfall (PTC) and seasonal monsoon rainfall (PSM). The former is induced by TC passage across Taiwan, while the later is caused by large-scale monsoon circulation. Climatologically, PTC and PSM accounts for 47.5% and 52.5% of total rainfall in Taiwan, respectively, showing a comparable contribution. On an interannual time scale, PTC and PSM anomalies tend to vary inversely. Two dominant rainfall variability types are found in Taiwan: enhanced PTC but suppressed PSM (T+S−) and suppressed PTC but enhanced PSM (T−S+). The T+S− type features a low-level anomalous cyclone and enhanced upward motion southeast of Taiwan. This favorable environmental condition leads to more TC formation in the region. TCs are further steered by mean southeasterly flows toward Taiwan to increase PTC (T+). As Taiwan is located in the western boundary of the anomalous cyclone, anomalous northeasterly water vapor fluxes hinder moisture supplies from the South China Sea into Taiwan, resulting in decreased PSM (S−). The T−S+ type concurs with an anomalous cyclone over Taiwan. Its center enhances upward motion and moisture fluxes from the South China Sea into Taiwan, yielding increased PSM (S+). Meanwhile, weak relative vorticity anomalies occur to the southeast of Taiwan, suppressing TC formation in the region. Mean southerly steering flows tend to drive more TCs toward Japan and the North Pacific, resulting in decreased TC frequency and PTC in Taiwan (T−). The present approach provides a new perspective for studying and predicting interannual rainfall variability via the separation of rainfall into TC- and monsoon-induced rainfall subcomponents, rather than looking solely at total rainfall. The result shows that there are two ways to significantly increase total rainfall in Taiwan (T+S− and T−S+), but there is only one way to decrease it (T−S−). The composites of circulation anomalies based on two rainfall indexes have more significant and coherent dynamic patterns than those sorted based on the total rainfall index.

The Influences of Convectively Coupled Kelvin Waves on Multiscale Rainfall Variability over the South China Sea and Maritime Continent in December 2016

2019 ◽  
Vol 32 (20) ◽  
pp. 6977-6993 ◽  
Author(s):  
Wei-Ting Chen ◽  
Shih-Pei Hsu ◽  
Yuan-Huai Tsai ◽  
Chung-Hsiung Sui
Keyword(s):  
South China Sea ◽  
South China ◽  
Rainfall Variability ◽  
Kelvin Waves ◽  
The South China Sea ◽  
The South ◽  
Maritime Continent ◽  
Scale Interactions ◽  
China Sea ◽  
Summer Monsoon Onset

ABSTRACT We studied the scale interactions of the convectively coupled Kelvin waves (KWs) over the South China Sea (SCS) and Maritime Continent (MC) during December 2016. Three KWs were observed near the equator in this month while the Madden–Julian oscillation (MJO) was inactive. The impacts of these KWs on the rainfall variability of various time scales are diagnosed, including synoptic disturbances, diurnal cycle (DC), and the onset of the Australian monsoon. Four interaction events between the KWs and the westward-propagating waves over the off-equatorial regions were examined; two events led to KW enhancements and the other two contributed to the formation of a tropical depression/tropical cyclone. Over the KW convectively active region of the MC, the DC of precipitation was enhanced in major islands and neighboring oceans. Over the land, the DC hot spots were modulated depending on the background winds and the terrain effects. Over the ocean, the “coastal regime” of the DC appeared at specific coastal areas. Last, the Australian summer monsoon onset occurred with the passage of a KW, which provided favorable conditions of low-level westerlies and initial convection over southern MC and the Arafura Sea. This effect may be helped by the warm sea surface temperature anomalies associated with the La Niña condition of this month. The current results showcase that KWs and their associated scale interactions can provide useful references for weather monitoring and forecast of this region when the MJO is absent.

scholarly journals An Empirical Study of the Response of the South China Sea Summer Monsoon to the Remote Forcing

SOLA ◽  
2012 ◽  
Vol 8 (0) ◽  
pp. 65-68 ◽  
Author(s):  
Rosbintarti Kartika Lestari ◽  
Toshiki Iwasaki
Keyword(s):  
South China Sea ◽  
Empirical Study ◽  
Summer Monsoon ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Remote Forcing
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