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A condition for the formation of Antarctic Bottom Water in Prydz Bay, Antarctica

【标题】A condition for the formation of Antarctic Bottom Water in Prydz Bay, Antarctica

【Title】A condition for the formation of Antarctic Bottom Water in Prydz Bay, Antarctica

【作者】 Su Jilan; 梁湘三; 董兆乾

【Author】 Liang Xiangsan ; Dong Zhaoqian

【期刊】极地研究

【Journal】

【期刊年份】1994

【卷】5

【期】

【关键词】 AABW; pseudoinverse; beta effect; upwelling; heat conduction

【Keywords】 AABW; pseudoinverse; beta effect; upwelling; heat conduction

【摘要】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.

【Abstract】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.

【基金/项目】

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