We identify loops and eddies from the trajectories of the drifters in the North Indian Ocean (NIO) from October 1985 to March 2019. We use the geometric identification method to identify loops and eddies and compare them with the loops identified from loopers provided by Lumpkin (2016). In NIO, the number of loops estimated from loopers is less than the number of loops and eddies identified by the geometric identification method. A total of 761 loops are identified, of which 346 are eddies, whereas the loops identified from loopers are only 149. Larger radii loops and eddies are observed in the western and central Bay of Bengal (BoB) and the southwestern part of the Arabian Sea (AS). Temporal variation of loops and eddies shows a peak during April–May in the AS and September–October in the BoB. In the BoB, the temporal variation of cyclonic eddies matches with the variation in chlorophyll.

我们从 1985 年 10 月至 2019 年 3 月北印度洋（NIO）漂流器的轨迹中识别循环和涡流。我们使用几何识别方法识别循环和涡流，并将它们与从 Lumpkin 提供的循环器识别的循环进行比较（ 2016）。在 NIO 中，looper 估计的环数小于几何识别方法识别的环数和涡流数。总共识别出 761 个环，其中 346 个是涡流，而从环中识别出的环只有 149 个。 在孟加拉湾 (BoB) 的西部和中部以及阿拉伯海的西南部观察到更大的半径环和涡流（作为）。环流和涡流的时间变化在 AS 的 4 月至 5 月和 BoB 的 9 月至 10 月期间达到峰值。在鲍勃，