引用本文:	周厚云,李铁刚,贾国东,朱照宇,迟宝泉,曹奇原,孙荣涛.应用长链不饱和烯酮重建末次间冰期以来冲绳海槽中部SST变化.海洋与湖沼,2007,38(5):438-445.

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应用长链不饱和烯酮重建末次间冰期以来冲绳海槽中部SST变化
周厚云^1,2,3, 李铁刚⁴, 贾国东¹, 朱照宇², 迟宝泉², 曹奇原⁴, 孙荣涛⁴
1.中国科学院广州地球化学研究所有机地球化学国家重点实验室广州510640;2.中国科学院广州地球化学研究所边缘海地质重点实验室广州510640;3.中国科学院地球环境研究所黄土与第四纪地质国家重点实验室西安710075;4.中国科学院海洋研究所青岛266071

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Z_14-6孔的长链(C₃₇)不饱和烯酮进行了分析。结果发现,该孔U₃₇^k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U₃₇^k重建的SST在24.0—27.5°C之间变化,最高值27.5°C出现在MIS-5,最低值24°C出现在MIS-2(LGM)。从LGM到全新世SST增加约2°C。这与早期在附近地区根据U₃₇^k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。

关键词: SST 不饱和烯酮冲绳海槽黑潮

DOI：

分类号:

基金项目: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。

附件

SEA SURFACE TEMPERATURE RECONSTRUCTION WITH LONG CHAIN UNSATURATED ALKENONES FOR THE MIDDLE OKINAWA TROUGH DURING THE LAST GLACIAL-INTERGLACIAL CYCLE

ZHOU Hou-Yun^1,2,3, LI Tie-Gang⁴, JIA Guo-Dong¹, ZHU Zhao-Yu², CHI Bao-Quan², CAO Qi-yuan⁴, SUN Rong-Tao⁴

1.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou,510640;2.Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou,510640;3.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences,Xi’an,710075;4.Institute of Oceanology, Chinese Academy of Sciences,Qingdao,266071

Abstract:

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 Z_14-6 on the east side of the middle trough. It was found that U₃₇^k for Core Z_14-6; 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°C with its highest value 27.5°C occurring in MIS-5 and the lowest value 24.0°C in MIS-2 [Last Glacial Maximum (LGM)]. The U₃₇^k-derived SST displays an increase of ~2°C 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 l0 ka B.P. The strengthening of the Kuroshio Current during 7.5 - 7 ka B.P. indicated by many other researchers, may be related to the Holocene Optimum.

Key words: SST, Unsaturated Alkenone, Okinawa Trough, Kuroshio Current