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首页> 外文期刊>Chinese science bulletin >Sea surface temperature and terrestrial biomarker records of the last 260 ka of core MD05-2904 from the northern South China Sea
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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

机译：南海北部MD05-2904岩心最后260 ka的海面温度和陆地生物标志物记录

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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 U-37(k') index reveals a minimum of 21.5 degrees C (MIS 2) and a maximum of 28.3 degrees C (MIS 5.5), for a temperature difference of almost 7 degrees C, and provides the longest high-resolution U-37(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 C-31/C-27 ratio, all reveal generally higher values during the glacials and lower values during the interglacials. 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 C-31/C-27 ratio during glacials indicate a change to more grassy vegetation. However, the highest values for CPI, ACL and the C-31/C-27 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.
机译：本文报告了南海北部（SCS）核心MD05-2904的最后260 ka的高分辨率生物标志物记录。使用U-37（k'）指数的海表温度（SST）记录显示，最低温度为21.5摄氏度（MIS 2），最高温度为28.3摄氏度（MIS 5.5），温度差接近7摄氏度，并提供北部SCS最长的高分辨率U-37（k'）SST记录。奇数长链正构烷烃的含量以及几种正构烷烃指数（如CPI，ACL和C-31 / C-27的比值）通常在冰期中显示较高的值，而在冰期中显示较低的值。正构烷烃含量所指示的陆地输入主要受海平面变化的控制：在冰川期间，较低的海平面暴露了大陆架，使河流能够将更多的陆地物质运输到斜坡上。在跨冰期之间，情况发生了逆转。正构烷烃指数的变化表明，由于核心站点与源区的接近，冰川期当代植被中正构烷烃的增加，而冰川期ACL和C-31 / C-27比率的增加表明正构烷烃的变化到更多草木植被。但是，CPI，ACL和C-31 / C-27比值的最高值都发生在MIS 3后期，这表明这一时期的特点是夏季季风为主的潮湿气候，导致植被茂密用于裸露的大陆架区域。

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