Revisiting the longest European paleoenvironmental archive

重访欧洲最长的古环境档案

• 批准号: NE/E009956/1
• 负责人: Polychronis Tzedakis
• 金额: $ 6.84万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FE009956%2F1
• 关键词: Revisiting; longest; European; paleoenvironmental; archive

Long marine, ice core and terrestrial archives spanning multiple glacial-interglacial cycles provide a unique perspective into the evolution of Quaternary climates. Firstly, they reveal a more complete view of the range of climate variability and associated biotic responses, and secondly, they allow us to observe long-term trends in the character of this variability. Among these archives, Tenaghi Philippon, NE Greece, has continued to occupy a prominent position despite the fact that pollen analyses were initiated as early as the 1960s. This is a function of (i) its temporal length, containing a record of vegetation changes of the last 1.35 million; and (ii) its completeness, as demonstrated by its close correspondence with global deep-sea records. However, the lower part of the record had low sampling resolution and, moreover, the original core is no longer curated. A new high-quality core of the upper 60m was recently obtained by a team led by Prof. J. Pross (Frankfurt), while a further coring campaign to reach a depth of 150m is currently being organized for Autumn 2007. This application seeks to obtain funding to extend the coring in 2007 from 150m to 200m (from about 0.9 to 1.35 million years ago [Ma]), reaching the base of the polleniferous deposits. The new core will be curated in Germany, where whole-core logging and palaeomagnetic analyses will initially be undertaken. This will form the basis of several future research grant proposals in association with German and Dutch colleagues. In the context of the current application, I propose to undertake a high-resolution pollen analysis of an early Pleistocene glacial-interglacial cycle around 0.95 Ma, an interval characterized by 41 thousand year (kyr) climate periodicity. More specifically, by examining the vegetation response within a 41-kyr glacial-interglacial cycle, it may be possible to test whether 'cryptic' precessional (23-kyr) variations in ice volume occurred, as recently suggested by Raymo et al. (2006) who pointed out that because precession is out of phase between hemispheres, changes in ice volume in each hemisphere would cancel out in globally integrated reconstructions of sea level. While the Raymo et al. hypothesis is difficult to test using palaeoceanographic or sea level proxies, changes in local vegetation may retain a memory of hemispheric ice expansion. Thus, if northern ice sheets did expand in the middle of the 41-kyr cycle in response to precession, that should, in principle, be reflected in a contraction of S. European tree populations.

长期的海洋，冰芯和陆地档案跨越多个冰川间冰期循环提供了一个独特的视角到第四纪气候的演变。首先，它们揭示了气候变异性范围和相关生物反应的更完整的观点，其次，它们使我们能够观察这种变异性特征的长期趋势。在这些档案中，希腊东北部的Tenaghi Philippon继续占据着突出的地位，尽管花粉分析早在20世纪60年代就开始了。这是一个函数：㈠其时间长度，包含最近135万年的植被变化记录; ㈡其完整性，与全球深海记录的密切对应证明了这一点。然而，记录的下半部分采样分辨率较低，而且原始岩心已不再保存。由J. Pross教授（法兰克福）领导的一个小组最近获得了上部60米的新的高质量岩心，目前正在组织2007年秋季的进一步取芯活动，以达到150米的深度。该申请旨在获得资金，以便在2007年将取芯从150米延长到200米（从大约0.9到1.35百万年前[Ma]），到达花粉沉积物的底部。新的岩心将在德国进行管理，在那里将首先进行全岩心测井和古地磁分析。这将构成与德国和荷兰同事联合提出的几项未来研究补助金提案的基础。在目前的应用程序的背景下，我建议进行高分辨率的花粉分析的早更新世冰川间冰期循环约0.95马，一个间隔的特点是41千年（kyr）的气候周期。更具体地说，通过检查41 kyr冰川-间冰期周期内的植被响应，有可能测试冰量是否发生了“神秘的”岁差（23 kyr）变化，正如Raymo等人（2006）最近提出的那样，他指出，由于岁差在半球之间是异相的，每一半球冰量的变化将在全球海平面综合重建中抵消。虽然雷莫等人的假设很难用古海洋学或海平面代用指标来检验，但当地植被的变化可能保留了半球冰扩张的记忆。因此，如果北方冰盖在41万年周期的中期确实因岁差而扩张，那么原则上，这应该反映在S的收缩上。欧洲树木种群