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首页> 外文期刊>Journal of Asian earth sciences >Late Quaternary climates of East Asia deduced from the total organic carbon contents of cored sediments (MD179-3304,3312) off Joetsu City, Japan Sea
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Late Quaternary climates of East Asia deduced from the total organic carbon contents of cored sediments (MD179-3304,3312) off Joetsu City, Japan Sea

机译：从日本海上越市外带芯沉积物的总有机碳含量（MD179-3304,3312）推算出的东亚第四纪晚期气候

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Total organic carbon (TOC) and total nitrogen (TN) concentrations are analyzed with high temporal resolution (ca. 100 years) for cores MD179-3304 and MD179-3312 taken from the Japan Sea off Joetsu City. The temporal changes in TOC and TN concentrations vary quasi-regularly in similar patterns. The age models are formed on the basis of the dates of ~(14)C dating, marker tephra beds, TL layers, and marine isotope events with depth. TOC concentration is high in MIS 1 and 5, low in MIS 2 and 4, and slightly elevated in MIS 3 with frequent short fluctuations. This general trend is very similar to LR04 curve, except for the reduced dominance of TOC around the MIS 5.5 substage. As shown typically in MIS 3, there are many peaks of TOC in a short interval. The details of these TOC peaks can be correlated with the warm interstadials of the Greenland ice core. We can identify a sawtooth-like decreasing trend of TOC in MIS 3. In contrast, the decreasing trend of δ~(18)O in the ice core corresponds to an increasing trend of TOC in MIS 5. The most plausible explanation for the correlation of climate changes between East Asia and the North Atlantic is oscillation of the Arctic polar front through time. The detailed correspondence of TOC concentrations of the Japan Sea sediments to other common paleoclimate proxies means that the TOC concentrations of these sediments is an excellent paleoclimate record in Far East Asia, although the genetic relationship between air temperature and biological productivity in the Japan Sea is as yet unknown.
机译：从上越市海上的日本海中获取的MD179-3304和MD179-3312岩心的总有机碳（TOC）和总氮（TN）浓度的分析具有较高的时间分辨率（约100年）。 TOC和TN浓度的时间变化以相似的方式准规则变化。年龄模型是根据〜（14）C年代，标记特非拉床，TL层和具有深度的海洋同位素事件的日期形成的。 MIS 1和5中的TOC浓度较高，MIS 2和4中的TOC浓度较低，而MIS 3中的TOC浓度则略有升高，并经常出现短暂的波动。该总体趋势与LR04曲线非常相似，除了在MIS 5.5子级​​周围TOC的主导地位降低之外。如MIS 3中通常所示，在很短的间隔内就有许多TOC峰。这些TOC峰的详细信息可以与格陵兰冰芯的温暖星际联系在一起。我们可以识别出MIS 3中TOC的锯齿状下降趋势。相反，冰芯中δ〜（18）O的下降趋势与MIS 5中TOC的上升趋势相对应。东亚和北大西洋之间气候变化的原因是北极极地锋随时间的振荡。日本海沉积物的TOC浓度与其他常见古气候代理的详细对应关系意味着，尽管日本海中气温与生物生产力之间的遗传关系如下，但在远东亚洲，这些沉积物的TOC浓度是极好的古气候记录。还未知。

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