High-resolution reconstruction of the paleoceanographic changes in the Japan Sea in response to the rapid changes in Asian monsoon

亚洲季风快速变化下日本海古海洋变化的高分辨率重建

基本信息

批准号：
15310008
负责人：
TADA Ryuji
金额：
$ 7.3万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15310008/
关键词：
Japan Sea Asian Monsoon Eolian Dust Holocene Westerly Surface water Deepwater Oxygen isotope 古海洋変動最終氷期東シナ海太陽活動モンスーン 14C年代アルケノン

项目摘要

This research project aims to 1)reconstruct paleoceanographic changes of the Japan Sea during the last glacial period to Holocene with high time resolution wing multiple cores obtained from the Japan Sea, 2)compare these changes with changes in paleo-monsoon intensity that is estimated from proxies extracted from the same sediment cares, and 3)clarify how the surface and deepwater environment of the Japan Sea responded to the changes in the pattern and intensity of East Asian monsoon.As indicators of the surface water environment, we used oxygen isotope ratio of planktonic foraminifers, alkenone paleatemperature, ^<14>C age of planktonic foraminifera, diatom assemblage, and organic carbon content to reconstruct temperature, salinity, origin, and biological productivity of the surface water. Whereas as indicators of the deepwater environment, degree of lamina preservation, C/S ratio, carbonate content, oxygen isotope ratio of benthic raminifers are used to reconstruct oxygenation, venti … More lation and corrosiveness of the deepwater. In addition, eolian dust grain size, flux, ESR signal intensity and crystallinity of quartz in the eolian dust component, and mineral composition are used to reconstruct westerly jet intensity, provenance of the eolian dust, and degree of dryness in the source areas.Based on these reconstructions, we examined phase relationships among changes in the surface water environment, deepwater environment, and variabilities of Asian monsoon. The results basically support the hypothesis by Tada et al. (1999) that increased intensity of Asian summer monsoon enhanced discharge of Yangtze and other Chinese rivers, consequent expansion of lower salinity and higher nutrient East China Sea Coastal Water to the entrance of the Tsushima Strait, and increased the influx of the East China Sea Coastal Water into the Japan Sea. This in turn enhanced surface productivity and density stratification within the Japan Sea. The results also demonstrated detailed changes of sea surface temperature, surface productivity, and deepwater ventilation in the Japan Sea in response to the intrusion of the East China Coastal Water into the Japan Sea. The results further suggest the possible occurrence of millennial-scale changes in Asian monsoon and consequent changes in paleoceanographic conditions in the Japan Sea during Holocene. Less

该研究项目的目的是1）重建日本海的古疗术变化，以全新世为型，以高时间分辨率翼从日本海获得的多个核心，2）将这些变化与古季型强度的变化进行比较，这些变化是从同一沉积物和深处响应的远景响应的，从同一沉积物中提取的古季度强度的变化，这些变化是从同一沉积物中提取出来的。季风。作为地表水环境的指标，我们使用了浮游孔的氧同位素比，烯烃paleatemperature， ^<14> c <14> c的年龄，浮游有孔虫的年龄，硅藻组合，有机碳含量和有机碳含量来重建温度，盐度，起源和生物学产品。作为深水环境的指标，椎板保存的程度，c/s比，碳酸盐含量，底栖拉尼仪的氧同位素比率用于重建氧合，venti…更多和更多的深水腐蚀性。此外，Elian的灰尘粒度，通量，ESR信号强度和Elian粉尘成分中石英的结晶度以及矿物组成用于重建西方喷气强度，Elian灰尘的来源以及来源区域中的干燥程度。基于这些重构，我们在地表水环境中的变化中的相关性在地表水环境中的变化中的相关性，深水环境，深水环境和多样性。结果基本上支持了Tada等人的假设。（1999年），亚洲夏季季风的强度增加增强了长江和其他中国河流的排放，随之而来的是盐度较低的盐分和较高的养分东中国海沿海水到tsushima海峡的入口处，并增加了东中国海沿海水对日本海的影响。这反过来又提高了日本海内的表面生产率和密度分层。结果还表明，日本海中海面温度，表面生产率和深水通风的详细变化，以响应东中国沿海水侵入日本海。结果进一步表明亚洲季风可能发生千禧一代变化，以及随后在全新世期间日本海的古疗造影条件的变化。较少的