Reconstruction of the variability of the Kuroshio Ocean Current (SE Japan) over the past 8 Ma

过去 8 Ma 黑潮洋流（日本东南部）变化的重建

• 批准号: 224608686
• 负责人: Professor Dr. Thorsten Bauersachs
• 金额: --
• 依托单位: Lehrstuhl für Organische Biogeochemie in Geo-Systemen (OBG)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/224608686?language=en
• 关键词: Reconstruction; variability; Kuroshio; Ocean; Current

The Kuroshio Ocean current (KOC) is the large north-western component of the subtropical North Pacific Ocean gyre and of major importance in the meridional transport of heat, mass, momentum, and moisture from the western Pacific warm pool to the northern mid-latitudes. Variation of shape, intensity and position of the KOC alternate over millennial timescales and significantly impact the climate of Japan and Asia. The main objective of the present proposal is the generation of a continuous, high resolution climate record of the present-day to Late Miocene in the western subtropical Pacific region. For this, we aim on investigating deep-sea sediments (Core C0011) of the Nankai Trough (SE-Japan) recovered during IODP Expedition 333 with bulk organic-geochemical and isotope techniques as well as lipid biomarker distributions. Bulk TOC, TOC/TN and δ13CTOC values will be generated to identify climate induced perturbations of the marine carbon-cycle. These intervals as well as the long-term climate evolution of the north-western Pacific will be studied in detail using the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) that allow the reconstruction of past sea surface temperatures. This molecular palaeothermometer proxy will be complemented by the use of unsaturated alkenones in the uppermost section of the core covering the last 250 ka. The generation of detailed SST curves will allow the in-depth study of climate evolution of the north-western Pacific, which is envisaged to be directly linked to the migration pattern of the Kuroshio Ocean Current.

黑潮洋流（Kuroshio Ocean Current，KOC）是北太平洋副热带环流的西北分量，在西太平洋暖池向北方中纬度地区的热量、质量、动量和水汽的纬向输送中起着重要作用。KOC的形状，强度和位置的变化在千年的时间尺度上交替变化，并对日本和亚洲的气候产生重大影响。本提案的主要目标是在西亚热带太平洋地区产生一个连续的，高分辨率的气候记录，从现在到晚中新世。为此，我们的目标是调查深海沉积物（核心C 0011）的南海海槽（SE-Japan）恢复在IODP远征333与散装有机地球化学和同位素技术以及脂质生物标志物的分布。将生成总有机碳、总有机碳/总氮和δ 13总有机碳值，以确定气候引起的海洋碳循环扰动。这些间隔以及西北太平洋的长期气候演变将详细研究使用甘油二烷基甘油四醚（GDGT）的分布，使过去的海表温度重建。这一分子古温度计代理将补充使用不饱和烯酮在核心的最高部分，涵盖了过去的250万年。生成详细的SST曲线将有助于深入研究西北太平洋的气候演变，据设想，西北太平洋的气候演变与黑潮洋流的迁移模式直接相关。