Covariation of the Indonesian Throughflow and South China Sea Throughflow Associated with the 1976/77 Regime Shift |
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Authors: | LIU Qinyan WANG Dongxiao ZHOU Wen XIE Qiang and ZHANG Yan |
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Institution: | Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology,Chinese Academy of Sciences, Guangzhou 510301,Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301,Guy Carpenter Asia-Pacific Climate Impact Centre, CityU-IAP Laboratory for Atmospheric Sciences, City University of Hong Kong, Hong Kong 00852,Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301,South China Sea Marine Engineering Prospecting, State Oceanic Administration, Guangzhou 510300 |
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Abstract: | Changes in the Indonesian Throughflow (ITF) and the South China Sea
throughflow---measured by the Luzon Strait Transport (LST)---associated with
the 1976/77 regime shift are analyzed using the Island Rule theory and the
Simple Ocean Data Assimilation dataset. Results show that LST increased but ITF
transport decreased after 1975. Such changes were induced by variations in wind
stress associated with the regime shift. The strengthening of the easterly wind
anomaly east of the Luzon Strait played an important role in the increase of
LST after 1975, while the westerly wind anomaly in the equatorial Pacific
contributed significantly to the decrease in ITF transport after 1975,
accounting for 53% of the change.
After 1975, the Kuroshio Current strengthened and the Mindanao
Current weakened in response to a decrease in the total transport of
the North Equatorial Current. Both the North Equatorial
Countercurrent and the South Equatorial Current weakened after 1975,
and an anomalous cyclonic circulation in the western equatorial
Pacific prevented the tropical Pacific water from entering the
Indian Ocean directly. |
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Keywords: | Indonesian throughflow Luzon Strait Transport regime shift wind anomaly |
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