菲律宾海北部19cal.kaBP以来表层海水温度变化

对菲律宾海北部E-2岩心柱(29.62°N、131.14°E,水深3 877m)进行了浮游有孔虫δ18 O分析、AMS14 C测年以及U3k7表层海水温度(U3k7-SST)的测试。结果表明,E-2岩心记录了约19cal.kaBP以来U3k7-SST变化过程,其末次冰消期整体变化过程与北大西洋高纬地区相似,记录了Heinrich 1(H1)、Blling/Allerd(B/A)和Younger Dryas(YD)等快速气候事件,同时也识别出发生于19.4～19.2和18.5～18.0cal.kaBP的2次变冷事件,说明了研究区与北大西洋气候存在遥相关;在B/A和YD阶段中发现的百年尺度气候波动及变化过程,可能反映了热带过程对研究区域的影响;E-2岩心柱末次冰消期变暖存在阶段性,其变暖时间开始于19.4cal.kaBP,而大幅升温阶段则从15.3cal.kaBP开始。

SEA SURFACE TEMPERATURE VARIATIONS IN THE NORTHERN PHILIPPINE SEA SINCE 19 CAL KABP

Planktonic foraminiferal δ18O,AMS14C ages and Uk37 derived sea surface temperature(Uk37-SST) were analyzed at the gravity core E-2 from the northern Philippine Sea(29.62°N、131.14°E,water depth 3 877 m,core length 282 cm).The results record the history of Uk37-SST variations since 19 cal kaBP.On the whole,the pattern of last deglaciation warming is similar to that in the high-latitude North Atlantic region,implying a climate tele-connection between the northern Philippine Sea and high-latitude North Atlantic.Some climate events are recognized such as Heinrich 1(H1),Blling/Allerd(B/A),Younger Dryas(YD),and other two cold events at 19.4~19.2 and 18.5~18.0 cal.kaBP respectively.The centennial-scale Uk37-SST variations are superimposed on the B/A and YD periods,probably suggesting a tropical influence on the study area.We also found that the last deglaciation warming probably began at ~19.4 cal.kaBP,and the more rapid warming started at ~15.3 cal.kaBP.