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Sea surface temperature and terrestrial biomarker records of the last 260 ka of core MD05-2904 from the northern South China Sea

ISSN号：0023-074X
期刊名称：《科学通报》
时间：0
分类：P7[天文地球—海洋科学]
作者机构：[1]State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
相关基金：Supported by the National Natural Science Foundation of China （Grant Nos. 40676032, 40776029 and 40403012） and the Innovation Research Group of the National Natural Science Foundation of China （Grant No. 40621063）;The samples used in this study were retrieved during the IMAGES XII, MD-147-Marco Polo Cruise of the R/V Marion Dufresne of the French Polar Institute （IPEV）. We thank Prof Sun Xiangjun for her constructive comments and suggestions on the manuscript and Wang Hui for her technical assistant.

作者： HE Juan ZHAO MeiXun LI Li WANG PinXian GE HuangMin[1]

关键词：北部南中国海, 海洋表面温度, 陆地输入, 海洋学, northern South China Sea, sea surface temperature, terrestrial input, source region vegetation

中文摘要：

这篇论文从北华南海(SCS ) 为核心 MD05- 2904 报导最后 260 ka 的高分辨率的简历标记记录。用 U-37 (k')索引的海表面温度( SST )记录揭示最少 21.5 度 C ( MIS 2 )和 28.3 度 C ( MIS 5.5 )的最大值，为几乎 7 度 C 的温度差别，并且在北 SCS 提供最长高分辨率的 U-37 (k') SST 记录。奇数的长链 n 链烷和几 n 链烷的内容索引例如 CPI， ACL 和 C-31/C-27 比率，都在 interglacials 期间在 glacials 和更低的价值期间揭示通常更高的价值。由 n 链烷内容显示了的陆上的输入被海平面的变化主要控制：在 glacials 期间，降低海平面暴露了大陆人架使河能把更陆上的材料搬运到斜坡；并且状况在 interglacials 期间逆行。n 链烷索引变化由于核心地点的最近在 glacials 期间从当代的植被揭示更多的 n 链烷到来源区域，当 ACL 和 C-31/C-27 比率的增加在 glacials 期间显示一个变化到更多的草多的植被时。然而，为 CPI， ACL 和 C-31/C-27 比率的最高的价值都在迟了的 MIS 3 期间发生了，并且这个时期到强壮的夏天被描绘，这被建议为暴露的大陆人架区域导致了更稠密的植被的季风主导的潮湿的气候。

英文摘要：

This paper reports high-resolution biomarker records of the last 260 ka for core MD05-2904 from the northern South China Sea （SCS）. The sea surface temperature （SST） record using the U37^k＇, index reveals a minimum of 21.5℃（MIS 2） and a maximum of 28.3℃（MIS 5.5）, for a temperature difference of almost 7℃, and provides the longest high-resolution U37^k＇ SST record in northern SCS. The content of odd-number long chain n-alkanes and several n-alkanes indexes such as the CPI, ACL and the C31/C27 ratio, all reveal generally higher values during the glacials and lower values during the interglaclals. Terrestrial input as Indicated by n-alkane content was mostly controlled by sea-level changes： During the glacials, lower sea-level exposed the continental shelf to enable rivers to transport more terrestrial materials to the slope; and the situation reverses during the interglacials. The n-alkane indexes changes reveal more n-alkanes from contemporary vegetation during glacials as a result of the proximity of the core site to the source region, while the increases in ACL and C81/C27 ratio during glaclals indicate a change to more grassy vegetation. However, the highest values for CPI, ACL and the C81/C27 ratio all occurred during late MIS 3, and it was suggested that this period was characterized by a strong summer monsoon-dominated humid climate which resulted in a denser vegetation for the exposed continental shelf region.