East Hainan upwelling fronts detected by remote sensing and modelled in summer

Xuezhi Zeng, Igor M. Belkin, Shiqiu Peng, Yineng Li
2014 International Journal of Remote Sensing  
Using the Belkin and O'Reilly algorithm and high-resolution (1 km) satellite sea surface temperature (SST) and chlorophyll-a (chl-a) data from 2002 to 2011, fronts were detected off the east/northeast coast of Hainan Island, South China Sea. These fronts were mainly produced by upwelling off eastern Hainan Island, through which cold, high-salinity, high-density, and nutrient-rich bottom water was brought to the surface and subsurface and then transported to the northeast of Hainan Island by the
more » ... ainan Island by the along-shore currents. The fronts are anisotropic, with a dominant orientation SSW-NNE. A three-dimensional ocean model forced by the Quick Scatterometer (QuikSCAT) winds was employed to study the three-dimensional structure of these fronts as well as the relationship between the fronts and upwelling or summer monsoon. The results show that the front intensity (cross-frontal gradient) is strongly correlated with the along-shore local winds, and has a strong seasonal and a weak inter-annual variation with a maximum of about 0.5°C km -1 at the subsurface (about 15 m) rather than the surface.
doi:10.1080/01431161.2014.916443 fatcat:vpccq5kw3jfylo73g47ap23fku