摘要
为了解自末次间冰期以来这一地区的古海水表层温度变化,应用气相色谱技术对取自冲绳海槽东侧的Z14?6孔的长链(C37)不饱和烯酮进行了分析。结果发现,该孔Uk37在0.83—0.95之间,其变化趋势与两种浮游有孔虫N.dutertrei和G.sacculifer的氧同位素组成一致。根据Uk37重建的SST在24.0—27.5℃之间变化,最高值27.5℃出现在MIS-5,最低值24℃出现在MIS-2(LGM)。从LGM到全新世SST增加约2℃。这与早期在附近地区根据Uk37重建的SST变化趋势一致。根据重建的SST自LGM以来的变化,作者认为现代黑潮洋流系统最晚在约10kaB.P.后已在冲绳海槽重新建立。许多早期研究揭示的黑潮在7.5—7kaB.P.的加强可能与全新世大暖期有关。
Okinawa Trough is an important area for investigation on the past climate, environment, and oceanography. To investigate sea surface temperature （SST） variation in this area during the last glacial-interglacial cycle, gas chromatography was used to determine long chain （C37） unsaturated alkenones in the sediments in Core 214.6 on the east side of the middle trough. It was found that U37^K for Core 214.6 varies between 0.83 and 0.95 with a trend parallel to those of the oxygen isotopic composition in two planktonic foraminifera, N. dutertrei and G. sacculifer. The U37^K-derived SST varies between 24.0 and 27.5℃ with its highest value 27.5℃ occurring in MIS-5 and the lowest value 24.0℃ in MIS-2 [Last Glacial Maximum （LGM）]. The Uk37-derived SST displays an increase of -2℃ from the LGM to the Holocene, which is consistent with previous studies carried out in this area. Based on the U37^K-derived SST variation since the LGM, it is suggested that modern Kuroshio Current was established in the Okinawa Trough no later than 10 ka B.E The strengthening of the Kuroshio Current during 7.5-7 ka B.E indicated by many other researchers, may be related to the Holocene Optimum.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2007年第5期438-445,共8页
Oceanologia Et Limnologia Sinica
基金
中国科学院知识创新工程项目
KZCX2-SW-133号
中国科学院有机地球化学国家重点实验室开放基金项目
OGL-200308号
黄土与第四纪地质国家重点实验室开放基金项目
SKLLQG0408号
中国科学院广州地化所创新项目
GIGCX-04-01号。周厚云
副研究员
E-mail:hyzhou@gig.ac.cn
关键词
SST
不饱和烯酮
冲绳海槽
黑潮
SST, Unsaturated Alkenone, Okinawa Trough, Kuroshio Current
