scholarly journals Interconnection between the Southern South China Sea and the Java Sea through the Karimata Strait

2021 ◽  
Vol 9 (10) ◽  
pp. 1040
Author(s):  
Poh Heng Kok ◽  
Sarath Wijeratne ◽  
Mohd Fadzil Akhir ◽  
Charitha Pattiaratchi ◽  
Nur Hidayah Roseli ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Boreal Summer ◽  
Boreal Winter ◽  
Southern South China Sea ◽  
Ocean Modelling ◽  
China Sea ◽  
New Finding ◽  
Seasonal Circulation ◽  
Java Sea

This study aims to investigate the interconnection between the southern South China Sea (SSCS) and Java Sea (JS) by simulating seasonal circulations and associated transports using the Regional Ocean Modelling System (ROMS). The seasonal circulation was predominantly driven by monsoonal wind stress and water exchanges between the SSCS and the JS. During the boreal winter, cooler and saltier waters from the SSCS were advected into the JS, while during the boreal summer, cooler waters from the JS were advected into the SSCS, with the advection of fresher water onto the Peninsular Malaysia’s east coast in the SSCS being the new finding provided by this study. The various water transports were driven southward into the JS during the boreal winter and northward into the SSCS during the boreal summer. The various water transports estimated by ROMS peaked in May during the inflow months from the JS into the SSCS, which was attributed to the simulated anticyclonic eddy in the SSCS, which differed from previous studies that peaked between June and August. The annual mean volume, freshwater, heat, and salt transports were 0.96 Sv, 0.04 Sv, 0.10 PW, and 0.03 × 109 kg s−1, respectively, directed from the SSCS into the JS.

scholarly journals PERANAN CROSS EQUATORIAL NORTHERLY SURGE TERHADAP DINAMIKA ATMOSFER DI WILAYAH INDONESIA BAGIAN BARAT

2020 ◽  
Vol 20 (1) ◽  
pp. 1-11
Author(s):  
Tyas Tri Pujiastuti ◽  
Nurjaman Nurjaman
Keyword(s):  
South China Sea ◽  
South China ◽  
Regional Scale ◽  
Atmospheric Dynamics ◽  
Southern South China Sea ◽  
Cold Surge ◽  
Main Research ◽  
China Sea ◽  
Research Areas ◽  
Java Sea

IntisariPada saat monsun dingin Asia berlangsung pada Oktober hingga Maret, sebagian wilayah Indonesia mengalami peningkatan curah hujan yang signifikan dibandingkan saat periode April hingga September. Selain dari pengaruh monsun, cuaca di wilayah Indonesia juga dipengaruhi oleh sirkulasi skala global dan regional yang terjadi secara simultan. Hal ini dapat memengaruhi dinamika atmosfer di sebagian wilayah Indonesia. Pada penelitian ini, dikaji aktivitas cross equatorial northerly surge yang terjadi pada skala regional serta dampaknya terhadap dinamika atmosfer di wilayah Indonesia bagian barat khususnya Laut China Selatan bagian selatan hingga Laut Jawa. Hasil penelitian menunjukkan bahwa cross equatorial northerly surge pada tahun 2013 terjadi paling kuat pada saat bersamaan dengan cold surge, dan memengaruhi pola divergensi, transpor kelembapan, dan omega, terutama di wilayah utama pada penelitian ini yaitu perairan Laut China Selatan hingga Laut Jawa, yang berpotensi mendukung terjadinya cuaca buruk di wilayah Bangka Belitung dan Jawa bagian barat.   AbstractDuring the Asia winter monsoon from October to March, parts of the Indonesian region experienced significant rainfall increases compared to the period from April to September. Apart from monsoon influence, the weather in the Indonesian region was also influenced by global and regional scale circulations, which occurred simultaneously. This can affect atmospheric dynamics in parts of the Indonesian region. In this study, the activities of cross-equatorial northerly surge that occurred on a regional scale and its impact on atmospheric dynamics conditions in western Indonesia, especially the southern South China Sea to the Java Sea, are examined. The results showed that the cross-equatorial northerly surge in 2013 occurred most strongly at the same time as cold surge, and influenced divergence, moisture transport, and omega patterns, particularly in the main research areas including South China Sea to the Java Sea, which have the potential to excite severe weather in Bangka Belitung and Western part of Java. 

Contrasting Characteristics of Convection over the Northern and Southern South China Sea during SCSMEX

2006 ◽  
Vol 134 (4) ◽  
pp. 1041-1062 ◽  
Author(s):  
Paul E. Ciesielski ◽  
Richard H. Johnson
Keyword(s):  
South China Sea ◽  
South China ◽  
Kelvin Wave ◽  
Southern South China Sea ◽  
Rainy Period ◽  
Stratiform Rain ◽  
China Sea ◽  
Convective Systems ◽  
Early Afternoon ◽  
Dominant Feature

Abstract Observations from two enhanced sounding arrays during the May–June 1998 South China Sea Monsoon Experiment (SCSMEX) are used to determine and contrast the properties of convection over the northern and southern South China Sea (SCS). A regression analysis between SST data and monthly rainfall indicates that the ENSO signal exerted a strong influence on the rainfall distribution over the SCS during SCSMEX. This resulted in wetter-than-normal conditions along the south China coast and northern SCS, and generally drier-than-average conditions elsewhere, particularly over the Philippine Islands. The monsoon onset as determined by a shift in the low-level winds from easterly to southwesterly over the SCS occurred around mid-May. Over the southern enhanced sounding array (SESA), the onset was characterized by a rainy period associated with the passage of a convectively coupled Kelvin wave. This was followed by a weeklong break and then several episodic rain events with increasingly higher rain rates. Rainfall over the northern enhanced sounding array (NESA), which was largely out of phase with SESA rainfall events, occurred primarily during two 10-day periods separated by a weeklong break. Convective characteristics over the SESA, deduced primarily from heat and moisture budget profiles, indicate a high stratiform rain fraction consisting of alternating periods with decaying mesoscale systems that organized near the western Borneo coastline and shallower convective clouds. In contrast, NESA-averaged profiles were indicative of deep convection with a relatively small stratiform rain fraction, which was confirmed with radar analyses during the onset convective period. The diurnal cycle of convection is a dominant feature throughout much of the SCS. Over both budget regions, early morning (0500–0800 LT) convective systems were frequently initiated near the coasts, then gradually dissipated during the course of the day as the midlevel steering currents moved the systems away from the coastline. These decaying convective systems resulted in an early afternoon (1400 LT) rainfall peak over both sonde arrays.

Numerical modeling of the seasonal circulation in the coastal ocean of the Northern South China Sea

2018 ◽  
Vol 14 (1) ◽  
pp. 90-109
Author(s):  
Yang Ding ◽  
Zhigang Yao ◽  
Lingling Zhou ◽  
Min Bao ◽  
Zhengchen Zang
Keyword(s):  
Numerical Modeling ◽  
South China Sea ◽  
South China ◽  
Northern South China Sea ◽  
Coastal Ocean ◽  
China Sea ◽  
Seasonal Circulation

Diurnal Cycle of Coastal Convection in the South China Sea Region and Modulation by the BSISO

2021 ◽  
pp. 1-53
Author(s):  
Weixin Xu ◽  
Steven A. Rutledge ◽  
Kyle Chudler
Keyword(s):  
South China Sea ◽  
South China ◽  
The Philippines ◽  
The South China Sea ◽  
Boreal Summer ◽  
Total Precipitation ◽  
The South ◽  
Low Level ◽  
China Sea ◽  
Diurnal Cycles

AbstractUsing 17-yr spaceborne precipitation radar measurements, this study investigates how diurnal cycles of rainfall and convective characteristics over the South China Sea region are modulated by the Boreal Summer Intraseasonal Oscillation (BSISO). Generally, diurnal cycles change significantly between suppressed and active BSISO periods. Over the Philippines and Indochina, where the low-level monsoon flows impinge on coast lines, diurnal cycles of rainfall and many convective properties are enhanced during suppressed periods. During active periods, diurnal variation of convection is still significant over land but diminishes over water. Also, afternoon peaks of rainfall and MCS populations over land are obviously extended in active periods, mainly through the enhancement of stratiform precipitation. Over Borneo, where the prevailing low-level winds are parallel to coasts, diurnal cycles (both onshore and offshore) are actually stronger during active periods. Radar profiles also demonstrate a pronounced nocturnal offshore propagation of deep convection over western Borneo in active periods. During suppressed periods, coastal afternoon convection over Borneo is reduced, and peak convection occurs over the mountains until the convective suppression is overcome in the late afternoon or evening. A major portion (> 70%) of the total precipitation over Philippines and Indochina during suppressed periods falls from afternoon isolated to medium-sized systems (< 10,000 km2), but more than 70% of the active BSISO rainfall is contributed by nocturnal (after 18 LT) broad precipitation systems (> 10,000 km2). However, offshore total precipitation is dominated by large precipitation systems (> 10,000 km2) regardless of BSISO phases and regions.

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