In this study, subsurface eddies near the Vietnam coast of the South China Sea were observed with in situ observations, including Argo, CTD, XBT and some processed and quality controlled data. Based on temperature pro...In this study, subsurface eddies near the Vietnam coast of the South China Sea were observed with in situ observations, including Argo, CTD, XBT and some processed and quality controlled data. Based on temperature profiles from four Argo floats near the coast of Vietnam, a subsurface warm eddy was identified in spring and summer. The multi-year Argo and Global Temperature and Salinity Profile Programme(GTSPP) data were merged on a seasonal basis based on the data interpolating variational analysis(DIVA) method to reconstruct the three-dimensional temperature structure. There is a warm eddy in the central subsurface at 12.5°N, 111°E below300 m depth in spring, which does not exist in autumn and is weak in winter and summer. From CSIRO Atlas of Regional Seas(CARS) and Generalized Digital Environment Model(GDEM) reanalysis data, this subsurface warm eddy is also verified in spring.展开更多
ENSO(El Niño-Southern Oscillation)phenomena have impacted on the hydrodynamic regime and environmental factors of the tropical ocean in general.In case of Vietnamese South-Central Waters,impacts of ENSO only focu...ENSO(El Niño-Southern Oscillation)phenomena have impacted on the hydrodynamic regime and environmental factors of the tropical ocean in general.In case of Vietnamese South-Central Waters,impacts of ENSO only focused on issues of changing seasonal wind,seawater temperature anomalies,changing of water masses as the air-sea interaction.Based on several data sets collecting in the period of 2003-2017,new finding of seawater temperature,salinity and environmental factors was identified in the water masses of Vietnamese South-Central Waters.The highest salinity was 35.4‰.During the El Nino event,increasing water temperature and salinity caused to move the deeper water masses to be closer to the sea surface than that initial depth in the neutral period.During the La Nina event,the temperature of most water masses reduced by 0.1-3.0℃,and then these water masses could be affected to the deeper layer.During the phase from strong ENSO event towards the neutral time,nutrient salts of the 4 water masses were lower concentration in the neutral year,causing the lack of phosphorus in sea surface water masses.展开更多
基金The National Natural Science Foundation of China under contract Nos 91428206,41206002,41706021 and41775053the China Postdoctoral Science Foundation under contract No.2014M551711the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No.XDA11010103
文摘In this study, subsurface eddies near the Vietnam coast of the South China Sea were observed with in situ observations, including Argo, CTD, XBT and some processed and quality controlled data. Based on temperature profiles from four Argo floats near the coast of Vietnam, a subsurface warm eddy was identified in spring and summer. The multi-year Argo and Global Temperature and Salinity Profile Programme(GTSPP) data were merged on a seasonal basis based on the data interpolating variational analysis(DIVA) method to reconstruct the three-dimensional temperature structure. There is a warm eddy in the central subsurface at 12.5°N, 111°E below300 m depth in spring, which does not exist in autumn and is weak in winter and summer. From CSIRO Atlas of Regional Seas(CARS) and Generalized Digital Environment Model(GDEM) reanalysis data, this subsurface warm eddy is also verified in spring.
基金funded by projects of DTDL.CN.17/28,Institute of Oceanography projects in 2016-2017 and VTUD.12/18-20。
文摘ENSO(El Niño-Southern Oscillation)phenomena have impacted on the hydrodynamic regime and environmental factors of the tropical ocean in general.In case of Vietnamese South-Central Waters,impacts of ENSO only focused on issues of changing seasonal wind,seawater temperature anomalies,changing of water masses as the air-sea interaction.Based on several data sets collecting in the period of 2003-2017,new finding of seawater temperature,salinity and environmental factors was identified in the water masses of Vietnamese South-Central Waters.The highest salinity was 35.4‰.During the El Nino event,increasing water temperature and salinity caused to move the deeper water masses to be closer to the sea surface than that initial depth in the neutral period.During the La Nina event,the temperature of most water masses reduced by 0.1-3.0℃,and then these water masses could be affected to the deeper layer.During the phase from strong ENSO event towards the neutral time,nutrient salts of the 4 water masses were lower concentration in the neutral year,causing the lack of phosphorus in sea surface water masses.
