Relationship of the interannual variability of the Indonesian Throughflow with the IOD over the tropical Indian Ocean |
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| Authors: | Jian Lan Jieli Hong Yi Wang |
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| Institution: | 1. Department of Oceanography, Physical Oceanography Laboratory, Ocean University of China, Qingdao, China
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| Abstract: | Based on the Simple Ocean Data Assimilation (SODA) reanalysis product, the interannual variability of the upper-ocean ITF volume transport from 1958 to 2001 is investigated. The wavelet analysis shows a second prominent interannual oscillation with a period of about 2–4 years. To reveal any relationship between this band-scale oscillation of the upper-ocean ITF and Indian Ocean Dipole (IOD), correlation and wavelet analyses are used. The correlation coefficient between the upper-ocean ITF and IOD reaches –0.35 with the upper-ocean ITF lagging the IOD index by 8 months. The dipole structure of IOD event is reproduced by the correlation with the upper-ocean ITF lagging the SST anomaly over the tropical Indian Ocean by 8 months from 1958 to 2001. The upper-ocean ITF and IOD show high coherency from about 1975 to 2001. The fact that the wavelet power spectrum of the upper-ocean ITF shows similar structure to that of IOD index supports this high coherency. These analyses suggest that the 2–4-year band-scale oscillation of the upper-ocean ITF is uniquely related to IOD over the tropical Indian Ocean. |
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