The northern boundary of the Indian sector of Southern Ocean is marked by the juncture of the Agulhas Return Front and the southern Subtropical Front and is a hydrographically dynamic region. During austral summer, a time series study (13^th to 15^th January 2012) was conducted in this region (40°S, 58°30′E) to discuss the episodic biochemical changes with respect to nutrient dynamics within the upper (120 m) water column. The observed nitrate was depleted in the upper 50 m. However, there was an influx of nitrate at 6 and 18 h of Day-1. Even though the nitrate was exceptionally low, the system was moderately productive, suggesting the rapid utilization of nitrate at this location. Also, the Degree of Nutrient Consumption, was high at 50 m (~0.4), compared to the rest of the water column indicating the presence of aged/old upwelled waters at 50 m. The observed influx of nutrients could be attributed to the wind induced mixing as well as the wind stress curl driven pumping at the periphery of the anticyclonic eddy at the location. Although the influx of nutrients was low, there was the rapid utilization of nutrients, which triggered a switch in the phytoplankton community structure and subsequently influencing the biogeochemical cycle.

印度洋南部边界的北部边界以阿古拉斯回返锋和南部亚热带锋的交汇处为标志，是一个水文动态区。在南方夏季，进行时间序列研究（13^日至15^日在该地区（40°S，58°30'E）进行了一次2012年1月），以讨论上部（120 m）水柱内营养动态的周期性生化变化。观察到的硝酸盐在上部50 m耗尽。但是，第1天的第6和18小时有硝酸盐流入。即使硝酸盐含量极低，该系统的生产率仍中等，这表明该位置硝酸盐的利用率很高。而且，与其余水柱相比，营养消耗程度高达50 m（〜0.4），表明在50 m处存在老化/老涌水。观察到的养分涌入可以归因于风引起的混合以及在该位置的反气旋涡的外围受到风应力卷曲驱动的泵送。尽管养分流入量很低，