SST gradient and reconstructed Antarctic Circumpolar Current latitude change in the Southern Indian Ocean over the last 150kyr

We reconstructed the SST gradient between MD11-3357 (44.68°S, 80.43°E, 3,349 m water depth) and MD11-3353 (50.57°S, 68.39°E, 1,568 m water depth) based on a revised TEXL86 calibration. The meridional SST gradient between the two sites was used to investigate the temporal evolution of Antarctic Circumpolar Current frontal displacements, based on a simple quantitative framework. There are 3 files in this date set. Two files for downcore GDGT fractions, GDGT indices, and revised SST for each site respectively, and one file for the SST gradient and reconstructed frontal latitude displacements.本研究基于修正后的TEXL86校准方案，重建了站位MD11-3357（南纬44.68°、东经80.43°，水深3349米）与MD11-3353（南纬50.57°、东经68.39°，水深1568米）之间的海表面温度（Sea Surface Temperature, SST）梯度。依托一套简洁的定量分析框架，利用上述两个站位间的经向海表面温度梯度，探究南极绕极流（Antarctic Circumpolar Current）锋面位移的时间演化特征。本数据集共计包含3个数据文件，其中2个文件分别对应各站位的岩心剖面GDGT（Glycerol Dialkyl Glycerol Tetraethers，甘油二烷基甘油四醚）组分、GDGT指标及修正后的海表面温度数据，剩余1个文件收录了海表面温度梯度与重建得到的锋面纬度位移数据。