Robust Diagnostic World Ocean Circulation with Half-Degree Resolution

1/2$^{\circ}$해상도의 진단적 전구 해수순환모형 연구

  • Published : 2001.03.01

Abstract

Global robust diagnostic models are established based on MOM of GFDL to study the circulation in the world ocean. The horizontal grid sizes 1/2 degree, and the vertical water column is divided into 21 levels. The hydrographic data are taken from Levitus et al.(1994) and the wind stress from Hellerman and Rosenstein (1983). Based on the model results the horizontal volume, heat and salt transports across some representative sections are calculated. The preliminary results show that Though the cross-equator volume transports in the Atlantic, Indian and Pacific Oceans are all small, the heat transports across equator in the Atlantic are northward. This is clearly a result of the southward flow of the North Atlantic Deep Water and the northward compensating warm flow in the upper layer. The annual mean of the cross-equator heat transport in the Pacific Ocean from the present model is significantly lower than that calculated by Philander et at. (1987). This might indicate the importance of the Indonesian Throughflow in the heat transport in the Pacific Ocean. Our calculation shows that the heat transport through the Indonesian Archipelago is 0.5 PW, which is comparable with the poleward heat transport in the North Atlantic and Pacific Oceans. The difference in heat transports across the sections 5 and 6 demonstrates the important role of the Agulhas Current in the heat balance of the world ocean.

GFDL의 진단적 모형인 MOM(Modular Ocean Model)을 이용한 전구 해수순환이 연구되었다. 모형의 수평 해상도는 1/2$^{\circ}$이며, 수직으로는 21개의 층을 가지고 있다. 열염 관측자료로는 Levitus등(1994)의 자료를, 바람응력자료는 Hellerman과 Rosenstein(1983)의 자료를 사용하였다. 대표적인 분할지역을 가로지르는 수평적 유량 및 열염이송이 모형결과로부터 계산되었다. 초기결과로서 다음과 같은 사실을 알 수 있었다. 대서양, 인도양 및 태평양에서 적도를 통한 수송량이 매우 작았지만 적도를 횡단하는 대서양지역의 열수송은 관측결과에 의하면 북향이었는데 이는 명백히 상층의 난류를 보상하는 북대서양 심해에서의 남향 흐름의 영향이다. 본 연구에서 계산된 태평양 적도지역의 연평균 열수송량은 Philander등(1987)에 의해 계산된 값보다는 작은 값을 보였는데 태평양의 열수송에서 Indonesian Throughflow의 중요성을 말해주는 것으로 보인다. 본 연구에서는 인도네시아 군도를 통한 열수송량이 -0.5PW 정도로 계산되었는데 북대서양과 태평양에서의 극방향 열수송과 비견될 만한 양이다. 구획5와 구획6해역의 열수송의 차이는 아굴라스 해류가 전구 해양의 열평형에서 차지하는 중요한 역할을 제시하였다.

Keywords

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