(Table 1) Stable carbon and oxygen isotope composition of foraminifera of DSDP Hole 13-132

The pelagic sedimentary sequences recovered by the Deep Sea Drilling Project (DSDP) from the Mediterranean are important because of their proximity to the classical shallow-water Neogene marine-type sections in Europe and because they may help correlations between the type sections and marine sequences outside the Mediterranean basin. We have studied the middle Pliocene (2.7-3.6 Myr ago) histories of surface-water temperature and oxygen isotopic composition at DSDP Site 132 in the Tyrrhenian Sea and here we compare these with another approach to estimating palaeotemperatures (Thunell, 1979, doi:10.1016/0377-8398(79)90013-6) based on the transfer function technique (Imbrie and Kipp, 1971). The record clearly shows a climatic cooling commencing between 3.2 and 3.0 Myr ago. An oxygen isotopic curve derived from the planktonic foraminiferan Globigerinoides ruber significantly correlates with a palaeotemperature record estimated from a transfer function palaeotemperature equation on planktonic foraminiferal data. Transfer functions may therefore be of value in interpreting palaeoclimatic history in sequences at least as old as the middle Pliocene.

由深海钻探计划（Deep Sea Drilling Project, DSDP）在地中海海域获取的远洋沉积序列（pelagic sedimentary sequences）具有重要研究价值：一方面其毗邻欧洲经典的浅水新近纪海相层型剖面，另一方面其可助力经典层型剖面与地中海盆地外海相序列之间的地层对比。本研究针对第勒尼安海DSDP 132站位展开，剖析了距今2.7~3.6百万年的上新世中期表层海水温度与氧同位素组成的演化历史，并将相关数据与基于传递函数技术（transfer function technique，Imbrie和Kipp, 1971）的古温度估算方法（Thunell, 1979, doi:10.1016/0377-8398(79)90013-6）所得结果进行对比。该记录清晰显示，气候变冷事件始于3.2~3.0百万年前。基于浮游有孔虫红拟抱球虫（Globigerinoides ruber）构建的氧同位素曲线，与基于浮游有孔虫数据通过传递函数古温度方程估算得到的古温度记录显著相关。因此，传递函数技术至少在距今上新世中期的沉积序列的古气候历史解译中具备应用价值。