(Table 1) Alkenone concentration, UK'37 index and derived sea surface temperatures for ODP Site 167-1020@en

Uk'37 sea-surface temperature (SST) estimates obtained at ~2.5-k.y. resolution from Ocean Drilling Program Site 1020 show glacial-interglacial cyclicity with an amplitude of 7°-10°C over the last 780 k.y. This record shows a similar pattern of variability to another alkenone-based SST record obtained previously from the Santa Barbara Basin. Both records show that oxygen isotope Stage (OIS) 5.5 was warmer by ~3°C relative to the present and that glacial Uk'37 temperatures warm in advance of deglaciation, as inferred from benthic d18O records. The alkenone-based SST record at Site 1020 is longer than previously published work along the California margin. We show that warmer than present interglacial stages have occurred frequently during the last 800 k.y. Alkenone concentrations, a proxy for coccolithophorid productivity, indicate that sedimentary marine organic carbon content has also varied significantly over this interval, with higher contents during interglacial periods. A baseline shift to warmer SST and greater alkenone content occurs before OIS 13. […]从大洋钻探计划（Ocean Drilling Program, ODP）1020站位获取的、分辨率约为2.5千年的Uk'37海表温度（sea-surface temperature, SST）估算结果显示，过去78万年间存在振幅为7℃-10℃的冰期-间冰期旋回。该记录与此前从圣巴巴拉盆地获取的另一项基于烯酮（alkenone）的海表温度记录具有相似的变化模式。两项记录均表明，氧同位素阶段（oxygen isotope Stage, OIS）5.5较现代偏暖约3℃，且如底栖氧同位素记录所推断的那样，冰期Uk'37温度在冰消作用启动前便开始升高。1020站位的基于烯酮的海表温度记录长度长于此前加州沿岸已发表的相关研究。研究显示，过去80万年间频繁出现较现代更为温暖的间冰期阶段。烯酮浓度作为颗石藻（coccolithophorid）生产力的代用指标，表明该时段内沉积海洋有机碳含量同样发生了显著变化，间冰期阶段的有机碳含量更高。在氧同位素阶段13之前，海表温度基线向暖态偏移，且烯酮含量也有所升高。[…]