| LAN Jian,SUN Shuangwen,HONG Jieli. 2007. The IOD signal in the upper-ocean Indonesian Throughflow since the mid-1970s. Acta Oceanologica Sinica, (4):1－6 |
| The IOD signal in the upper-ocean Indonesian Throughflow since the mid-1970s |
| The IOD signal in the upper-ocean Indonesian Throughflow since the mid-1970s |
| Received:February 17, 2007 Revised:June 05, 2007 |
| DOI： |
| Key words:Indonesian Throughflow Indian Ocean dipole interannual variability |
| 中文关键词: Indonesian Throughflow Indian Ocean dipole interannual variability |
| 基金项目: |
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| Abstract: |
| On the basis of simple ocean data assimilation (SODA) reanalysis product, the interannual variability of upper-ocean Indonesian Throughflow (ITF) volume transport since the mid 1970s is examed. The wavelet analysis shows a second prominent interannual oscillation with a period of about 2~4 a. To reveal any relationship between this band-scale oscillation of upper-ocean ITF and the Indian Ocean dipole (IOD), the correlation and wavelet analyses are used. The correlation coefficient between the upper-ocean ITF and the IOD reaches -0.40 with upper-ocean ITF lagging an IOD index by eight months. The wavelet power spectrum of upper-ocean ITF shows similar structure to that of the IOD index. And the evolution of IOD is reproduced by lagged correlation between the upper-ocean ITF and the sea surface temperature anomaly (SSTA) over the Indian Ocean. It suggests that the 2~4 a band-scale oscillation of upper-ocean ITF is related uniquely to the IOD over the tropical Indian Ocean. |
| 中文摘要: |
| On the basis of simple ocean data assimilation (SODA) reanalysis product, the interannual variability of upper-ocean Indonesian Throughflow (ITF) volume transport since the mid 1970s is examed. The wavelet analysis shows a second prominent interannual oscillation with a period of about 2~4 a. To reveal any relationship between this band-scale oscillation of upper-ocean ITF and the Indian Ocean dipole (IOD), the correlation and wavelet analyses are used. The correlation coefficient between the upper-ocean ITF and the IOD reaches -0.40 with upper-ocean ITF lagging an IOD index by eight months. The wavelet power spectrum of upper-ocean ITF shows similar structure to that of the IOD index. And the evolution of IOD is reproduced by lagged correlation between the upper-ocean ITF and the sea surface temperature anomaly (SSTA) over the Indian Ocean. It suggests that the 2~4 a band-scale oscillation of upper-ocean ITF is related uniquely to the IOD over the tropical Indian Ocean. |
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