The spatiotemporal variation of the wind-induced near-inertial energy flux in the mixed layer of the South China Sea

2015 ◽  
Vol 34 (1) ◽  
pp. 66-72 ◽  
Author(s):  
Juan Li ◽  
Junliang Liu ◽  
Shuqun Cai ◽  
Jiayi Pan
Keyword(s):  
South China Sea ◽  
Energy Flux ◽  
Mixed Layer ◽  
South China ◽  
Spatiotemporal Variation ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Inertial Energy

Seasonal variability of the wind-generated near-inertial energy flux in the South China Sea

2019 ◽  
Vol 38 (4) ◽  
pp. 136-145
Author(s):  
Baonan Sun ◽  
Zhan Lian ◽  
Yeli Yuan ◽  
Haiyang Xu
Keyword(s):  
South China Sea ◽  
Energy Flux ◽  
South China ◽  
Seasonal Variability ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Inertial Energy

scholarly journals Estimate of Ocean Mixed Layer Deepening after a Typhoon Passage over the South China Sea by Using Satellite Data

2013 ◽  
Vol 43 (3) ◽  
pp. 498-506 ◽  
Author(s):  
Jiayi Pan ◽  
Yujuan Sun
Keyword(s):  
South China Sea ◽  
Surface Temperature ◽  
Mixed Layer ◽  
South China ◽  
The South China Sea ◽  
Temperature Profiles ◽  
The South ◽  
Translation Speed ◽  
China Sea ◽  
Sst Cooling

Abstract The ocean responses to Typhoon Cimaron, which influenced the South China Sea (SCS) from 1 to 8 November 2006, are analyzed. Based on satellite-observed sea surface temperature (SST) and climatological temperature profiles in the SCS, mixed layer deepening, an important parameter characterizing turbulent mixing and upwelling driven by strong typhoon winds, is derived. Corresponding to the SST drop of 4.4°C on 3 November 2006, the mixed layer deepened by 104.5 m relative to the undisturbed depth of 43.2 m, which is consistent with a simulation result from a mixed layer model. Furthermore, baroclinic geostrophic velocity and vorticity are calculated from the surface temperature gradient caused by the typhoon. The negative vorticity, associated with the typhoon cooling, indicated an anticyclonic baroclinic circulation strongest at the base of the mixed layer and at the depth of 50 m, the geostrophic speed reached as high as 0.2 m s−1. Typhoon Cimaron proceeded slowly (1.7 m s−1) when it was making a southwestward turn on 3 November 2006, resulting in a subcritical condition with a Froude number (the ratio of typhoon translation speed to first baroclinic mode speed) of 0.6 around the maximum SST drop location and facilitating high SST cooling and mixed layer deepening because of the absence of inertial-gravity waves in the wake of the typhoon. Comparison of Argo buoy data with the climatological temperature suggests that the average uncertainty in the mixed layer deepening estimation caused by the difference between Argo and climatological temperature profiles is less than 10 m.

scholarly journals Tropical Cyclone–Induced Ocean Response: A Comparative Study of the South China Sea and Tropical Northwest Pacific*,+

2015 ◽  
Vol 28 (15) ◽  
pp. 5952-5968 ◽  
Author(s):  
Wei Mei ◽  
Chun-Chi Lien ◽  
I.-I. Lin ◽  
Shang-Ping Xie
Keyword(s):  
South China Sea ◽  
Mixed Layer ◽  
South China ◽  
Regional Difference ◽  
Chlorophyll Concentration ◽  
The South China Sea ◽  
Northwest Pacific ◽  
The South ◽  
China Sea ◽  
Sst Cooling

Abstract The thermocline shoals in the South China Sea (SCS) relative to the tropical northwest Pacific Ocean (NWP), as required by geostrophic balance with the Kuroshio. The present study examines the effect of this difference in ocean state on the response of sea surface temperature (SST) and chlorophyll concentration to tropical cyclones (TCs), using both satellite-derived measurements and three-dimensional numerical simulations. In both regions, TC-produced SST cooling strongly depends on TC characteristics (including intensity as measured by the maximum surface wind speed, translation speed, and size). When subject to identical TC forcing, the SST cooling in the SCS is more than 1.5 times that in the NWP, which may partially explain weaker TC intensity on average observed in the SCS. Both a shallower mixed layer and stronger subsurface thermal stratification in the SCS contribute to this regional difference in SST cooling. The mixed layer effect dominates when TCs are weak, fast-moving, and/or small; and for strong and slow-moving TCs or strong and large TCs, both factors are equally important. In both regions, TCs tend to elevate surface chlorophyll concentration. For identical TC forcing, the surface chlorophyll increase in the SCS is around 10 times that in the NWP, a difference much stronger than that in SST cooling. This large regional difference in the surface chlorophyll response is at least partially due to a shallower nutricline and stronger vertical nutrient gradient in the SCS. The effect of regional difference in upper-ocean density stratification on the surface nutrient response is negligible. The total annual primary production increase associated with the TC passage estimated using the vertically generalized production model in the SCS is nearly 3 times that in the NWP (i.e., 6.4 ± 0.4 × 1012 versus 2.2 ± 0.2 × 1012 g C), despite the weaker TC activity in the SCS.

scholarly journals Observations of Shoaling Internal Wave Transformation Over a Gentle Slope in the South China Sea

2021 ◽  
Author(s):  
Steven R. Ramp ◽  
Yiing Jang Yang ◽  
Ching-Sang Chiu ◽  
D. Benjamin Reeder ◽  
Frederick L. Bahr
Keyword(s):  
Kinetic Energy ◽  
South China Sea ◽  
Energy Flux ◽  
South China ◽  
The South China Sea ◽  
Wave Transformation ◽  
Recent Theory ◽  
The South ◽  
China Sea ◽  
The Waves

Abstract. Four oceanographic moorings were deployed across the South China Sea continental slope near 21.85° N, 117.71° E, from May 30 to July 18, 2014 for the purpose of observing high-frequency nonlinear internal waves (NLIWs) as they shoaled across a rough, gently sloping bottom. Individual waves required just two hours to traverse the array and could thus easily be tracked from mooring-to-mooring. In general, the amplitude of the incoming NLIWs was a good match with the fortnightly tidal envelope in the Luzon Strait, lagged by 48.5 hours, and were smaller than the waves observed 50 km to the southwest near the Dongsha Plateau. The now-familiar type a-waves and b-waves were observed, with the b-waves always leading the a-waves by 6–8 hours. Most of the waves were remotely generated, but a few of the b-waves formed locally via convergence and breaking at the leading edge of the upslope internal tide. Waves incident upon the array with amplitude less than 50 m and energy less than 100 MJ m−1 propagated adiabatically upslope with little change of form. Larger waves formed packets via wave dispersion. For the larger waves, the kinetic energy flux decreased sharply upslope between 342 m to 266 m while the potential energy flux increased slightly, causing an increasing ratio of potential-to-kinetic energy as the waves shoaled. The results are in rough agreement with recent theory and numerical simulations of shoaling waves.

Multi-decadal changes in the South China Sea mixed layer salinity

2021 ◽  
Author(s):  
Lili Zeng ◽  
Eric P. Chassignet ◽  
Xiaobiao Xu ◽  
Dongxiao Wang
Keyword(s):  
South China Sea ◽  
Mixed Layer ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea

Winter phytoplankton blooms in the shallow mixed layer of the South China Sea enhanced by upwelling

2006 ◽  
Vol 59 (1-2) ◽  
pp. 97-110 ◽  
Author(s):  
Chung-Chi Chen ◽  
Fuh-Kwo Shiah ◽  
Shi-Wei Chung ◽  
Kon-Kee Liu
Keyword(s):  
South China Sea ◽  
Mixed Layer ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
Phytoplankton Blooms ◽  
China Sea

Biases of five latent heat flux products and their impacts on mixed-layer temperature estimates in the South China Sea

2017 ◽  
Vol 122 (6) ◽  
pp. 5088-5104 ◽  
Author(s):  
Xin Wang ◽  
Rongwang Zhang ◽  
Jian Huang ◽  
Lili Zeng ◽  
Fei Huang
Keyword(s):  
Heat Flux ◽  
South China Sea ◽  
Latent Heat ◽  
Latent Heat Flux ◽  
Mixed Layer ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Mixed Layer Temperature
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