scholarly journals West Pacific subtropical high double ridges and intraseasonal variability of the South China Sea summer monsoon

2009 ◽  
Vol 100 (3-4) ◽  
pp. 385-396 ◽  
Author(s):  
Li Qi ◽  
Jinhai He ◽  
Zuqiang Zhang ◽  
Zhaoyong Guan
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
Intraseasonal Variability ◽  
The South China Sea ◽  
Subtropical High ◽  
The South ◽  
West Pacific ◽  
China Sea ◽  
West Pacific Subtropical High

scholarly journals Intraseasonal Variability of the South China Sea Summer Monsoon

2005 ◽  
Vol 18 (13) ◽  
pp. 2388-2402 ◽  
Author(s):  
Jiangyu Mao ◽  
Johnny C. L. Chan
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
Intraseasonal Variability ◽  
Lower Troposphere ◽  
Monsoon Trough ◽  
The South China Sea ◽  
The South ◽  
Central Pacific ◽  
China Sea

Abstract The objective of this study is to explore, based on the National Centers for Environmental Prediction–National Center for Atmospheric Research (NCEP–NCAR) reanalysis data, the intraseasonal variability of the South China Sea (SCS) summer monsoon (SM) in terms of its structure and propagation, as well as interannual variations. A possible mechanism that is responsible for the origin of the 10–20-day oscillation of the SCS SM is also proposed. The 30–60-day (hereafter the 3/6 mode) and 10–20-day (hereafter the 1/2 mode) oscillations are found to be the two intraseasonal modes that control the behavior of the SCSSM activities for most of the years. Both the 3/6 and 1/2 modes are distinct, but may not always exist simultaneously in a particular year, and their contributions to the overall variations differ among different years. Thus, the interannual variability in the intraseasonal oscillation activity of the SCS SM may be categorized as follows: the 3/6 category, in which the 3/6 mode is more significant (in terms of the percentage of variance explained) than the 1/2 mode; the 1/2 category, in which the 1/2 mode is dominant; and the dual category, in which both the 3/6 and 1/2 modes are pronounced. Composite analyses of the 3/6 category cases indicate that the 30–60-day oscillation of the SCS SM exhibits a trough–ridge seesaw in which the monsoon trough and subtropical ridge exist alternatively over the SCS, with anomalous cyclones (anticyclones), along with enhanced (suppressed) convection, migrating northward from the equator to the midlatitudes. The northward-migrating 3/6-mode monsoon trough–ridge in the lower troposphere is coupled with the eastward-propagating 3/6-mode divergence–convergence in the upper troposphere. It is also found that, for the years in the dual category, the SCS SM activities are basically controlled by the 3/6 mode, but modified by the 1/2 mode. Composite results of the 1/2-mode category cases show that the 10–20-day oscillation is manifest as an anticyclone–cyclone system over the western tropical Pacific, propagating northwestward into the SCS. A close coupling also exists between the upper-level convergence (divergence) and the low-level anticyclone (cyclone). It is found that the 1/2 mode of the SCS SM mainly originates from the equatorial central Pacific, although a disturbance from the northeast of the SCS also contributes to this mode. The flow patterns from an inactive to an active period resemble those associated with a mixed Rossby–gravity wave observed in previous studies.

scholarly journals Impacts of the Wave Train along the Asian Jet on the South China Sea Summer Monsoon Onset

Atmosphere ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1227
Author(s):  
Li Xu ◽  
Zi-Liang Li
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
Southern Oscillation ◽  
Wave Train ◽  
The South China Sea ◽  
Subtropical High ◽  
Positive Phase ◽  
The South ◽  
China Sea

The South China Sea (SCS) summer monsoon (SCSSM) onset signifies the commencement of large-scale summer monsoon over East Asia and the western North Pacific (WNP). Previous studies on the influencing factors of the SCSSM onset mainly focus on the tropical systems, such as El Niño-Southern Oscillation (ENSO). This study reveals that the wave train along the Asian jet could act as an extratropical factor to modulate the SCSSM onset, and it is largely independent of ENSO. The SCSSM onset tends to be earlier during the positive phase of the wave train (featured by northerly anomalies over Central Iran plateau and eastern China, southerly anomalies over Arabian Peninsula, eastern Indian subcontinent, and eastern Bonin islands). The wave train affects the SCSSM onset mainly via modulating the WNP subtropical high. The wave train during the positive phase can induce negative geopotential height anomalies in the mid-troposphere and anomalous cyclones in the lower-troposphere over the SCS and the Philippine Sea, leading to the weakening of the WNP subtropical high. Specifically, the anomalous ascending motions associated with the low-level cyclone are favorable for the increased rainfall over the SCS, and the anomalous westerly on the south of the anomalous cyclone is conducive to the transition of the zonal wind (from easterly to westerly). The above circulation anomalies associated with the positive phase of the wave train provide a favorable environment for the advanced SCSSM onset.

scholarly journals Selective Response of the South China Sea Circulation to Summer Monsoon

2017 ◽  
Vol 47 (7) ◽  
pp. 1555-1568
Author(s):  
Haiyuan Yang ◽  
Lixin Wu ◽  
Shantong Sun ◽  
Zhaohui Chen
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
Rossby Waves ◽  
Intraseasonal Variability ◽  
The South China Sea ◽  
Intrinsic Variability ◽  
The South ◽  
China Sea ◽  
Basin Mode

AbstractThe response of the South China Sea (SCS) circulation to intraseasonal variability of the summer monsoon is studied with both observations and a 1.5-layer reduced-gravity model. Intraseasonal variability of the SCS summer monsoon is characterized by evolution of the wind jet intensity in the midbasin with typical amplitude of 6 m s−1 and several peaks on its power spectrum between 10 and 60 days. However, this study finds that intraseasonal variability of the sea surface height (SSH) in the SCS presents significant variability to the southeast of Vietnam with amplitude of 6 cm and a period only between 40 and 60 days. This implicates the frequency selectivity of oceanic response to wind forcing. Numerical experiments suggest that the intrinsic variability of the SCS circulation accounts for this phenomenon. Based on the Rossby basin mode theory, this is explained by the interaction between the long, westward-propagating Rossby waves and the short, eastward-propagating Rossby waves.

Taxonomic notes on the genus Salmoneus Holthuis, 1955 (Decapoda, Caridea, Alpheidae) from the South China Sea

Crustaceana ◽  
2016 ◽  
Vol 89 (14) ◽  
pp. 1585-1609 ◽  
Author(s):  
Yanrong Wang ◽  
Zhongli Sha
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
West Pacific ◽  
China Sea ◽  
Pacific Species

Four species of the genusSalmoneusHolthuis, 1955 are described and illustrated in the present paper, including two newly recorded species,Salmoneus cristatus(Coutière, 1897) andSalmoneus tricristatusBanner, 1959. The mouthparts of these two species are illustrated herein. A key to all Indo-West Pacific species of the genusSalmoneusis provided as well.

scholarly journals The role of synoptic-scale waves in the onset of the South China Sea summer monsoon

2018 ◽  
Vol 19 (11) ◽  
pp. e858 ◽  
Author(s):  
Jingliang Huangfu ◽  
Wen Chen ◽  
Xu Wang ◽  
Ronghui Huang
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
The South China Sea ◽  
Synoptic Scale ◽  
The South ◽  
China Sea

scholarly journals Draft Genome Sequences of Two Bacterial Strains, Muricauda sp. 72 and NH166, Isolated from the South China Sea and West Pacific Ocean

2019 ◽  
Vol 8 (44) ◽  
Author(s):  
Ying Zheng ◽  
Cong Sun
Keyword(s):  
Pacific Ocean ◽  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Bacterial Strains ◽  
The South ◽  
Genome Sequences ◽  
West Pacific ◽  
China Sea ◽  
West Pacific Ocean

Here, we report the whole-genome sequences of two bacterial strains, Muricauda sp. 72 and NH166, isolated from the South China Sea and West Pacific Ocean, respectively. These two strains may represent a novel species of the genus Muricauda, and the features of their genome sequences will enrich our understandings of strains in the genus Muricauda.

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