For improved understanding of ocean circulation in the northern Indian Ocean region, long term continuous record of radiocarbon measurement is required. Limited radiocarbon records from the region demands investigations of natural archives. Coral core records along with some literature data were analysed to study the temporal changes in ¹⁴C values over the northern Indian Ocean. The major fraction of the bomb radiocarbon appears to have transferred in to the ocean, as recent records from the surface seawater Δ¹⁴C values show comparable or even higher than the atmospheric Δ¹⁴C values. The northern Andaman region showed higher Δ¹⁴C decline rate between 1978 and 2014 compared to the southern Bay of Bengal and the Lakshadweep region. The comparable southern Bay of Bengal and the Lakshadweep Δ¹⁴C values could be due to transfer of Arabian Sea waters to the southern Bay of Bengal. The southern Andaman region shows lower Δ¹⁴C values compared to the northern Andaman region, suggesting the influence of ¹⁴C depleted waters in the region.

为了更好地了解北印度洋地区的海洋环流，需要对放射性碳测量进行长期连续记录。该地区有限的放射性碳记录需要对自然档案进行调查。分析了珊瑚核心记录以及一些文献数据，以研究北印度洋上¹⁴ C 值的时间变化。炸弹放射性碳的主要部分似乎已转移到海洋中，因为最近来自表层海水 Δ ¹⁴ C 值的记录显示与大气中的 Δ ¹⁴ C 值相当甚至更高。北部安达曼地区表现出较高的 Δ ¹⁴与孟加拉湾南部和 Lakshadweep 地区相比，1978 年至 2014 年间的 C 下降率。可比较的孟加拉湾南部和 Lakshadweep Δ ¹⁴ C 值可能是由于阿拉伯海水域转移到孟加拉湾南部。与安达曼北部地区相比，安达曼南部地区显示出较低的 Δ ¹⁴ C 值，表明该地区¹⁴ C 枯竭水域的影响。