The Effect of ENSO on Hydrological Structure and Environment in the South Central Coast – Vietnam

Pham Xuan Duong (Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), Nha Trang, Vietnam)
Hoang Trung Du (Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), Nha Trang, Vietnam)
Vo Tran Tuan Linh (Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), Nha Trang, Vietnam; State Key Laboratory of Estuarine and Coastal Research (SKLEC), East China Normal University, Shanghai, China)
To Duy Thai (Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), Nha Trang, Vietnam)
Phan Minh-Thu (Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), Nha Trang, Vietnam;Graduate University of Science and Technology, VAST, Ha Noi, Vietnam)

Article ID: 1215

Abstract


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°C, 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.


Keywords


Effect of ENSO; Hydrodynamic regime; South Central Coast – Vietnam

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References


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DOI: https://doi.org/10.30564/jms.v2i1.1215

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