@article{Lanh_Son_Tuan_2007, title={THE STRONG AND STABLE UPWELLING AND DOWNWELLING REGIONS IN THE ECMAN LAYER OF THE SOUTH CHINA SEA}, volume={7}, url={https://vjs.ac.vn/index.php/jmst/article/view/6336}, DOI={10.15625/1859-3097/7/2/6336}, abstractNote={<p>On the  basis of distribution of curl (τ/f) computed by the means monthly data of wind and relationship  between the  curl (τ/f) with the vertical velocity W [equation (5)], the  regions of upwelling [Rot(τ/f) >  0, W  < 0] and downwelling [Rot(τ/f) < 0, W > 0] in the Ecman layer of South China Sea were determined. The  results indicates that the upwelling and downwelling phenomena are occurred almost everywhere in  the  sea, but  the  most  strong (/W/ ≥ 10<sup>-3</sup> cm/s) and stale ones in the following locations:</p> <p>1. Very strong upwelling in he Southern Central Vietnam coastal and shelf waters during South West Monsoon (Fig. 2). The hydrological analysis indicate that in the centre of the upwelling, the /W/ can  reach to 10<sup>-1</sup> – 10<sup>-2</sup> cm/s, the water temperature anomaly - to  -3 ÷ -5<sup>0</sup>C and salinity anomaly - to  +1,2%o at the depths of 50 - 100 m.</p> <p>2. The strong upwelling in the region North West and South West of Luzon island during North East Monsoon, when the water temperature anomaly can reach to -3<sup>0</sup>C and salinity - to +1%o at the depths of 50 – 100 m (Fig. 1).</p> <p>3. The strong downwelling in the Southern Central Vietnam coastal and shelf waters and in the region South West of Taiwan during North East Monsoon (Fig. 1).</p> τ is the wind stress, f is the Coriolic parameter, W is the vertical velocity.}, number={2}, journal={Vietnam Journal of Marine Science and Technology}, author={Lanh, Vo Van and Son, Tong Phuoc Hoang and Tuan, Nguyen Van}, year={2007}, month={Jun.} }