Remote sensing observation and numerical modeling of an upwelling jet in Guangdong coastal water
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AbstractAn upwelling event that occurred in Guangdong coastal water on July 14-16, 2003 is observed by using satellite multisensor data including the Moderate Resolution Imaging Spectroradiometer (MODIS) sea surface temperature (SST) and QuikSCAT ocean surface winds. Successive MODIS SST images reveal expansion process of a jet-like upwelling cold water body in surface layer. The regional ocean model system (ROMS) is used to explore the upwelling dynamics. The modeling successfully reproduces the jet-like shape of the surface upwelling water as well as the upwelling developing process. Analyses of modeling momentums reveal that the large offshore transport appeared on the west side of Honghai Bay as a result of high alongshore pressure gradient and nonlinear advections, and the enhanced horizontal advection also played an important role in developing the prominent upwelling in Honghai Bay. A numerical experiment is conducted to confirm that it was the wind driven upwelling rather than the wind-induced vertical turbulent mixing that induced the surface cold water. Further numerical analyses suggest that strong internal tides occurred in Honghai Bay caused by the local bottom topography. The interaction between the upwelling and internal tides enhances the bottom water uplifting. The offshore expansion of the upwelling water is controlled by the cross-shore topography slope: a gentle and offshore extended slope helps the bottom water climbing up to the surface in a wide range in cross-shore direction, whereas a steep and narrow slope restricts the expansion of the upwelling water and confines the cold water in a narrow band along the shore.
All Author(s) ListGu YZ, Pan JY, Lin H
Journal nameJournal of Geophysical Research
Volume Number117
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesGEOSCIENCES, MULTIDISCIPLINARY; Oceanography

Last updated on 2021-26-09 at 02:37