Upwelling off the west coast of Hainan Island in summer: Its detection and mechanisms

Details Upwelling off the west coast of Hainan Island in summer: Its detection and mechanisms Upwelling off the west coast of Hainan Island in summer: Its detection and mechanisms

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3502604l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 2, CiteID L02604

Mathematics

Logic

5

Oceanography: General: Upwelling And Convergences (4964), Oceanography: General: Coastal Processes, Oceanography: General: Numerical Modeling (0545, 0560), Oceanography: Physical: Fronts And Jets, Oceanography: Physical: Nearshore Processes

Scientific paper

The summertime upwelling off the west coast of Hainan Island is newly detected by satellite remote sensing sea surface temperature, and confirmed by both historical field observations and numerical modeling. Furthermore, numerical experiments are conducted to gain understanding of the upwelling mechanisms. A tidal mixing front (TMF) is identified as the vital factor triggering the formation of the upwelling. The baroclinic pressure gradient force, which stems from the intense density difference across the TMF, causes a frontal-scale circulation at the TMF. As a result, upwelling appears as a branch of this circulation. The southwest monsoon induces downwelling, which competes with the front-induced upwelling. Climatologically, the upwelling dominates and can reach about 5 m below the sea surface above the slope bottom. In calm weather with no or weak winds, it is expected that the upwelling can reach all the way to the sea surface.

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