Sediment cores MD19-3575CQ, MD19-3580, COR-1PC, PS2606-6 - subsurface, surface temperature (full resolution and resampled), and DeltaT records@en

We present five new records in four sediment cores of the Indian sector of the Southern Ocean. Radiolarian based subsurface temperatures (subST) were reconstructed using SORAD as a training dataset (Lawler et al., 2021; Civel-Mazens et al., 2023) with the Imbrie and Kipp Method applied to log transformed data. Diatom based sea surface temperatures (SST) were predicted using a dataset containing 249 samples as per Crosta et al. (2020) and applying the Modern Analog Technique to relative abundances of 33 diatom taxa. The SST records of cores DCR-1PC (Crosta et al., 2020) and MD19-3580 (this study) and the subST records of cores MD19-3575CQ and MD19-3580 (this study) were resampled at a 3kyrs interval to substract subST to SST at the two core sites (DCR-1PC/MD19-3575CQ and MD19-3580). This allowed to reconstruct the evolution of the delta of temperature (deltaT) between surface and subsurface. We here include the resampled and deltaT records.本研究针对南大洋印度洋扇区的4根沉积岩芯，报道了5条全新的环境记录。基于放射虫的地下温度（subsurface temperatures, subST）以SORAD作为训练数据集，采用Imbrie-Kipp法对对数转换后的数据进行重建（Lawler等，2021；Civel-Mazens等，2023）。基于硅藻的海表温度（sea surface temperatures, SST）则依据Crosta等（2020）的方法，采用包含249个样品的数据集，针对33个硅藻分类群的相对丰度应用现代类比法（Modern Analog Technique, MAT）进行重建。针对岩芯DCR-1PC（Crosta等，2020）与MD19-3580（本研究）的海表温度记录，以及岩芯MD19-3575CQ与MD19-3580（本研究）的地下温度记录，本研究以3千年（kyr）为间隔进行重采样，以计算两处岩芯位点（DCR-1PC/MD19-3575CQ与MD19-3580）的地下温度与海表温度差值（deltaT）。由此得以重建表层与次表层之间温度差的演化历程。本研究在此提供重采样后的温度记录与温度差记录。