期刊
CONTINENTAL SHELF RESEARCH
卷 31, 期 10, 页码 1087-1095出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2011.03.013
关键词
Shelf-scale circulation; Upwelling; Heat content; Monsoon; Interannual variability
类别
The ocean circulation on Australia's Northern Shelf is dominated by the Monsoon and influenced by large-scale interannual variability. These driving forces exert an ocean circulation that influences the deep Timor Sea Passage of the Indonesian Throughflow, the circulation on the Timor and Arafura Shelves and, further downstream, the Leeuwin Current. Seasonal maxima of northeastward (southwestward) volume transports on the shelf are almost symmetric and exceed 10(6) m(3)/s in February (June). The associated seasonal cycle of vertical upwelling from June to August south of 8.5 degrees S and between 124 degrees E and 137.5 degrees E exceeds 1.5 x 10(6) m(3)/s across 40 m depth. During El Nino events, combined anomalies from the seasonal means of high regional wind stresses and low inter-ocean pressure gradients double the northeastward volume transport on the North Australian Shelf to 1.5 x 10(6) m(3)/s which accounts for 20% of the total depth-integrated transport across 124 degrees E and reduce the total transport of the Indonesian Throughflow. Variability of heat content on the shelf is largely determined by Pacific and Indian Ocean equatorial wind stress anomalies with some contribution from local wind stress forcing. (C) Crown Copyright 2011 Published by Elsevier Ltd. All rights reserved.
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