Alkenone-based SST measurements from MIS 3 to MIS 11 in the northwestern Mediterranean Sea

Here we present a Sea Surface Temperature (SST) record based on the Uk'37 index from the PRGL 1 borehole (Promess1) drilled on the upper slope of the Gulf of Lions (GL). This is the first continuous and high-resolution record in the northwestern Mediterranean Sea from MIS 3 to MIS 11.
Due the location of the GL, the SST proxy can be considered to be a reliable tool to study the climate link between high and middle latitudes. During glacial inceptions, the northern ice-sheet signal via cold northwesterly winds was first recorded in our study area in comparison with southern locations, highlighting the strong sensitivity of this location to high-latitude dynamics. Moreover, the amplitude of the millennial-scale variability in the western Mediterranean basin seems to be the result of both ice-sheet and insolation variability.

本研究基于取自狮子湾（Gulf of Lions, GL）上斜坡的PRGL 1钻孔（Promess1）的Uk'37指数（Uk'37 index），构建了海表温度（Sea Surface Temperature, SST）记录。该记录为地中海西北部首个覆盖深海氧同位素3期（MIS 3）至深海氧同位素11期（MIS 11）的连续高分辨率序列。鉴于狮子湾的地理位置，该海表温度代用指标可作为研究高、中纬度气候联系的可靠工具。在冰期启动阶段，相较于地中海南部区域，本研究区域率先通过寒冷西北风记录到北半球冰盖信号，凸显了该区域对高纬度动力过程的高度敏感性。此外，西地中海盆地千年尺度气候变率的振幅，似乎同时受冰盖变化与日射变化的共同调控。