Species Identification and Isotopic Analysis of Southern Ocean MPN

Abstract

The stable oxygen isotope ratio of mixed layer planktonic foraminifera collected from tow samples along the latitudinal transect from 47049’S to 64005’S during summer time over the Southern Ocean. Samples were collected during the Expeditions – SOE IX and SOE X. The analysis of δ18O of foraminifera together with ocean water δ18O allowed deciphering the state of equilibrium -disequilibrium relationship at a particular temperatures; which varied across the latitude. We observed a subtle disequilibrium relationship on approaching the 5000’S latitude, which may be due to secondary reservoir effect