In this study, we show the relationship between sea-level anomalies (SLA) and upper-ocean parameters in the Equatorial Indian Ocean (EIO). This work also focuses on the variability of SLA obtained from satellite altimeter data in different spatial and temporal scales and its relationship with computed ocean heat content (OHC), dynamic height (DH), and thermocline depth (20 °C isotherm: D20) during 1993–2015. SLA showed low Pearson’s correlation coefficient (CC) with upper-ocean parameters over central EIO resembling a “Monopole” pattern. The Array for Real-time Geostrophic Oceanography (ARGO) in situ profile data in the central EIO also confirmed this. SLA over this monopole showed low correlations with all parameters as compared with eastern and western EIO. These findings show a clear signature of a persisting sea-level monopole in the central EIO. Oscillating SLA over western and eastern EIO during summer and winter monsoon months is found to be responsible for locking this monopole in the central EIO. Both SLA and OHC increased in EIO during 2006–2015 compared with 1993–2005. The month of January showed different east–west trends at different times. This trend during 1993–2015 is neutral, but it shifted from negative during 1993–2005 to positive during 2006–2015.

在这项研究中，我们显示了赤道印度洋（EIO）中的海平面异常（SLA）与上层海洋参数之间的关系。这项工作还着重于在不同时空范围内从卫星高度计数据获得的SLA的变异性及其与计算的海洋热量（OHC），动态高度（DH）和跃层深度（20°C等温线：D20）的关系。 1993年-2015年。SLA在中央EIO上表现出低的Pearson相关系数（CC）和上层海洋参数，类似于“单极”模式。中央EIO中的实时地转海洋学阵列（ARGO）原位剖面数据也证实了这一点。与东部和西部EIO相比，此单极子上的SLA与所有参数的相关性较低。这些发现清楚地表明了中央EIO中持续存在的海平面单极子。在夏季和冬季季风月份，在东部和东部EIO上振荡的SLA被发现是造成将此单极子锁定在中央EIO的原因。与1993-2005年相比，2006-2015年SLA和OHC的EIO均增加。一月在不同时间显示出不同的东西向趋势。1993-2015年期间，这种趋势是中性的，但从1993-2005年期间的负向转变为2006-2015年期间的正向。