摘要
Based on the analysis of the field observation data off the Changjiang mouth in August 2000 and satellite image of sea surface temperature (SST) in summer of 1997, it indicates that there exists the upwelling event on the west side of the submerged river valley (SRV) off the Changjiang mouth. The calculated results of the three-dimensional nu-merical model show that this upwelling is induced by the barotropic effect, baroclinic effect, bottom Ekman effect and their interaction with the slope bottom topography. The baroclinic effect is the main cause producing the upwelling at the northern SRV (on the east side of the South Passage of the Changjiang estuary), while the barotropic effect is the main cause at the southern SRV (on the east side of the cen-ter of the Hangzhou Bay mouth). The dynamic mechanism producing the upwelling off the Changjiang mouth is differ-ent with the general one along coast and on the continental shelf.
Based on the analysis of the field observation data off the Changjiang mouth in August 2000 and satellite image of sea surface temperature (SST) in summer of 1997, it indicates that there exists the upwelling event on the west side of the submerged river valley (SRV) off the Changjiang mouth. The calculated results of the three-dimensional nu-merical model show that this upwelling is induced by the barotropic effect, baroclinic effect, bottom Ekman effect and their interaction with the slope bottom topography. The baroclinic effect is the main cause producing the upwelling at the northern SRV (on the east side of the South Passage of the Changjiang estuary), while the barotropic effect is the main cause at the southern SRV (on the east side of the cen-ter of the Hangzhou Bay mouth). The dynamic mechanism producing the upwelling off the Changjiang mouth is differ-ent with the general one along coast and on the continental shelf.
基金
suppoaed by the Major State Research Program of China(Grant No.G1999043803)
the Teaching and Research Award Fund for Outstanding Young Teachers in Higher Education Institutions of MOD,China
the National Natural Science Foundation of China(Grant No.40376027)
关键词
动力学机制
长江口
夏季
上升流
数字仿真
off the Changjiang mouth, upwelling, field observation, numerical simulation, dynamic mechanism.
