Through Pseudoinverse inference of the circulation in Prydz Bay and its adjacent open ocean during January to March 1981, and comaing the results with that of 1991, we find that when the polar easterly hence the east ...Through Pseudoinverse inference of the circulation in Prydz Bay and its adjacent open ocean during January to March 1981, and comaing the results with that of 1991, we find that when the polar easterly hence the east wind drift is strong and extends its influence north of the slope, it is difficult for the Circumpolar Deep Water(CDW) to upweu onto the shelf, and congruently the Antarctic botom Water(AABW) cannot form in the bay by way of mixing scheme Of Forter and Carmack(1976). However, when the East Wind Drift weakens and confines itself over the shelf, the weSterly current will press on the slope and revolve anticyclonically so long as it is fairly strong. Such an anticyclonical Pattern manifests itseir mainly in the lower layer, and as a result, it will make the CDW upwell onto the shelf, providing an essential prerequisite for the formation of the AABW. We have analyzed this phenomenon from a dynamical view, and pointed out that the law of heat conduction accounts for its formation, in which the planetary and topographical beta effeCts play major roles.展开更多
An inverse model is used to infer the circulation in Prydz Bay and its adjacent open ocean using hydrographic data obtained by the cruise of the 7th Chinese National Antarctic Research Expedition (CHINARE-7), 1990/91....An inverse model is used to infer the circulation in Prydz Bay and its adjacent open ocean using hydrographic data obtained by the cruise of the 7th Chinese National Antarctic Research Expedition (CHINARE-7), 1990/91. Barotropic components are found to be strong in the study area, esp. at the Antarctic Divergence, and from a whole view, the velocity is rather small. In the open ocean, the flow is quasizonal, but outside the bay it shows a tendency of pressing onto the shelf from surface to bottom, and a feature of intensification just east of Fram Bank. We suggest here be the most important place to detect the possibility of the Antarctic Bottom Water formation. The meridional profiles of the distribution indicate a strong (relative to the ambient) core and a slope-trapped part into the bargain. In the southeastern part of the bay, there seems to exist a strong coastal current flowing westward. The computed upwelling centers are mainly situated in the west of the study region, as agrees quite well with the early hydrographic observations and the areas of high krill biomass.展开更多
基金supported by the National Natural Science Foundation of China (Grant Numbers. 41276033)the Jiangsu Science and Technology Support Project (Grant Number. BE2014729)+1 种基金the support from Jiangsu Provincial Government through Jiangsu Chair Professorshipthe 2015 Jiangsu Program of Entrepreneurship and Innovation Group
文摘Through Pseudoinverse inference of the circulation in Prydz Bay and its adjacent open ocean during January to March 1981, and comaing the results with that of 1991, we find that when the polar easterly hence the east wind drift is strong and extends its influence north of the slope, it is difficult for the Circumpolar Deep Water(CDW) to upweu onto the shelf, and congruently the Antarctic botom Water(AABW) cannot form in the bay by way of mixing scheme Of Forter and Carmack(1976). However, when the East Wind Drift weakens and confines itself over the shelf, the weSterly current will press on the slope and revolve anticyclonically so long as it is fairly strong. Such an anticyclonical Pattern manifests itseir mainly in the lower layer, and as a result, it will make the CDW upwell onto the shelf, providing an essential prerequisite for the formation of the AABW. We have analyzed this phenomenon from a dynamical view, and pointed out that the law of heat conduction accounts for its formation, in which the planetary and topographical beta effeCts play major roles.
文摘An inverse model is used to infer the circulation in Prydz Bay and its adjacent open ocean using hydrographic data obtained by the cruise of the 7th Chinese National Antarctic Research Expedition (CHINARE-7), 1990/91. Barotropic components are found to be strong in the study area, esp. at the Antarctic Divergence, and from a whole view, the velocity is rather small. In the open ocean, the flow is quasizonal, but outside the bay it shows a tendency of pressing onto the shelf from surface to bottom, and a feature of intensification just east of Fram Bank. We suggest here be the most important place to detect the possibility of the Antarctic Bottom Water formation. The meridional profiles of the distribution indicate a strong (relative to the ambient) core and a slope-trapped part into the bargain. In the southeastern part of the bay, there seems to exist a strong coastal current flowing westward. The computed upwelling centers are mainly situated in the west of the study region, as agrees quite well with the early hydrographic observations and the areas of high krill biomass.
