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利用50 a的SODA资料对1月(冬季)和7月(夏季)印度洋越赤道经向翻转环流的年际变化进行研究。通过对2类典型年份的合成分析指出:1月份正异常年对应的经向翻转环流偏强,向北的经向热输送增加;7月份正异常年对应的经向翻转环流则偏弱,向南的经向热输送减少;1月份和7月份的负异常年皆与其正异常年相反;越赤道经向翻转环流有明显的年际变化,平均周期在4 a左右;经向翻转环流的年际变化和海面风场的变化密切相关。提出了反映1月和7月此环流年际变化的几个指数。
Using the 50-year-old SODA data, the interannual variability of over-the-equatorial meridional circulation in January (winter) and July (summer) Indian Ocean was studied. Based on the composite analysis of two typical years, it is pointed out that the warp overrun circulation corresponding to positive anomalies was stronger in January and the meridional heat transport to the north increased. In July, the warp turning circulation corresponding to positive anomalies was weaker, The meridional heat transport in the south decreases; the negative anomalies in January and July are opposite to their positive anomalies; the cross-equatorial meridional overturning circulation has obvious interannual variation with an average period of about 4 years; The change is closely related to the change of sea surface wind field. Several indices are presented that reflect the interannual variation of this circulation in January and July.