PLANKTONIC FORAMINIFERA FROM THE SOUTHWESTERN CONTINENTAL SLOPE OF THE SOUTH CHINA SEA SINCE LAST GLACIAL AND THEIR PALEO-CLIMATE IMPLICATION
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摘要: 对南海西南陆坡区SA08-34柱状样浮游有孔虫进行了定量统计分析,并采用古生态转换函数FP-12E计算各样品所代表的海水表层古温度(SST),结合14C测年和CaCO3分析结果,揭示了该海域末次冰期以来的古海洋学特征。末次冰期以来SST具有较大的变化,其中冰后期SST冬季为24.85~26.23℃,夏季为28.81~29.36℃,季节温差为2.66~4.47℃;末次盛冰期SST有明显的周期性波动,SST冬季为23.60~26.86℃,夏季为28.45~29.63℃,季节温差为2.34~5.09℃;末次间冰段SST冬季为23.48~27.57℃,夏季为28.82~29.73℃,季节温差为2.16~5.34℃。南海西南陆坡区在末次冰期出现6次明显的海水表层降温事件,其中"新仙女木"事件的年代约为11.75~12.38 kaBP,H1-H4事件的年代分别约为15.51~16.76、21.15~22.40、26.79~27.42和34.31~34.94 kaBP。Abstract: Planktonic foraminifera have been studied quantitatively for cores SA08-34 of the southwestern continental slope of the South China Sea, and sea surface paleotemperature(SST) was estimated by using transfer function FP-12E. The above results, together with 14C dating and carbonate analysis,have revealed paleoceanographic changes in the southwestern continental slope of the South China Sea since the last glacial. SST varied greatly since the last glacial. The post-glacial SST was estimated to be 24.85~26.23℃ in winter, and 28.81~29.36℃ in summer, with seasonal temperature differences of 2.66~4.47℃. SST fluctuated periodically in the last glacial maximum, and the SST was 23.60~26.86℃ in winter, and 28.45~29.63℃ in summer, with seasonal temperature differences of 2.34~5.09℃. SST was 23.48~27.57℃ in winter, 28.82~29.73℃ in summer and 2.16~5.34℃ in seasonal temperature differences in the MIS 3. Six obvious short-term SST descending events have been recognized in the last glacial. The age of "Younger Dryas" event was estimated at 11.75~12.38 kaBP, and the H1~H4 events were estimated at 15.51~16.76, 21.15~22.40, 26.79~27.42 and 34.31~34.94 kaBP, respectively.
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