Pan-hemispheric synchrony/asynchrony of D/O events: replication of Suigetsu chronology and extension of Japanese lateglacial event stratigraphy

D/O事件的全半球同步/异步：水月年代学的复制和日本晚冰期事件地层学的扩展

• 批准号: NE/D000289/1
• 负责人: Takeshi Nakagawa
• 金额: $ 6.67万
• 依托单位: Newcastle University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FD000289%2F1
• 关键词: Pan; hemispheric; synchrony; asynchrony; events

Global warming is a very important issue for modern human society. One efficient way of understanding the nature and mechanism of such rapid global climate change is to use changes in past climate as analogues of what is happening today. The last termination, i.e. the end of the last Glacial period, and the trend of climate changes towards the Holocene is often considered to be a good analogue for contemporary global warming. Comparison of climate changes between different regions is particularly important because it provides a key for identifying the trigger of climate changes and the mechanism of inter-regional linkage. In particular, the chronological lag and lead of common climatic events between regions is an important information source because the lag and lead can often be considered to be representing the relationship of trigger and response. Lake Suigetsu (Japan) is one of only a few study sites (together with some North Atlantic sites) which are suitable for this purpose because of its undisturbed sediment and high-potential for high-resolution age determination (at centennial to decadal scales). Previous studies of the Lake Suigetsu pollen record have revealed that some short-term (millennial scale) climate oscillations common in the N. Atlantic have their counterparts in Japan, but frequently these changes are asynchronous either leading or lagging those in the N Atlantic by a few centuries and often display different amplitude (Nakagawa et al., 2003). In order to check if these patterns are consistent over time, it is necessary to re-core the lake and extend the work to the older time slices. We plan to obtain a pair of 25 m long sediment cores and establish an accurate chronology using both annual lamination counting and intensive 14C dating. High-resolution pollen analysis will be used to reconstruct glacial to early Holocene climate changes (the last 30,000 years). The principal goals of our study are to (i) establish an event stratigraphy in Japan using an independent age scale, (ii) compare it to other climate proxy curves from other regions, and (iii) detect synchrony/asynchrony and differences in amplitude of climatic events between different regions (most typically Japan, N. Atlantic and Antarctica). Very careful age-based correlation of the climate proxy curves from different regions should provide insights into the mechanisms involved in global climate changes.

全球变暖是现代人类社会面临的一个非常重要的问题。理解这种快速全球气候变化的性质和机制的一个有效方法是将过去气候的变化与今天发生的情况进行类比。最后一个终止，即末次冰期的结束，以及气候向全新世的变化趋势通常被认为是当代全球变暖的一个很好的类比。不同区域之间气候变化的比较尤为重要，因为它为确定气候变化的触发因素和区域间联系的机制提供了一把钥匙。特别是，区域间共同气候事件的时间滞后和超前是一个重要的信息来源，因为滞后和超前往往可以被认为是代表触发和响应的关系。水月湖（日本）是适合于这一目的的为数不多的几个研究地点之一（以及北大西洋的一些地点），因为它的沉积物未受扰动，而且很有可能进行高分辨率的年龄测定（百年至十年尺度）。以前对水月湖花粉记录的研究表明，北半球一些常见的短期（千年尺度）气候振荡。大西洋在日本也有对应的变化，但这些变化往往是异步的，要么领先大西洋北部，要么落后大西洋北部几个世纪，而且往往显示出不同的幅度（Nakagawa等人，2003年）。为了检查这些模式是否随着时间的推移而保持一致，有必要重新对湖进行核心化，并将工作扩展到较旧的时间片。我们计划获得一对25米长的沉积物芯，并建立一个准确的年表，使用每年的分层计数和密集的14 C测年。高分辨率花粉分析将用于重建冰川到全新世早期的气候变化（过去30，000年）。本研究的主要目的是（i）使用独立的年龄尺度建立日本的事件地层学，（ii）将其与其他地区的气候代用曲线进行比较，（iii）检测不同地区（最典型的是日本、北日本、北日本）之间气候事件的同步性/同步性和振幅差异。大西洋和南极洲）。对不同区域的气候代用曲线进行非常仔细的基于年龄的相关性分析，应有助于深入了解全球气候变化所涉及的机制。

项目成果

Event layers in the Japanese Lake Suigetsu 'SG06' sediment core: description, interpretation and climatic implications

• DOI: 10.1016/j.quascirev.2013.10.026
• 发表时间: 2014
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: G. Schlolaut;A. Brauer;M. Marshall;T. Nakagawa;R. Staff;C. Ramsey;H. Lamb;C. Bryant;R. Naumann-R.-Nau

Atlas of pollen, spores and further non-pollen palynomorphs recorded in the glacial-interglacial late Quaternary sediments of Lake Suigetsu, central Japan

• DOI: 10.1016/j.quaint.2012.02.002
• 发表时间: 2013-03-21
• 期刊: QUATERNARY INTERNATIONAL
• 影响因子: 2.2
• 作者: Demske, Dieter;Tarasov, Pavel E.;Nakagawa, Takeshi
• 通讯作者: Nakagawa, Takeshi