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Collaborative Research: Organic geochemical and isotopic reconstructions of North Pacific climate and sea ice variability

合作研究：北太平洋气候和海冰变化的有机地球化学和同位素重建

基本信息

批准号：
0961697
负责人：
Timothy Shanahan
金额：
$ 27.61万
依托单位：
University of Texas at Austin
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2010
资助国家：
美国
起止时间：
2010-06-15 至 2014-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0961697&HistoricalAwards=false
关键词：
Collaborative Research Organic geochemical isotopic

项目摘要

Reconstructing past sea ice cover is a fundamental challenge in paleoceanography/paleoclimate research. Conceptual and numerical models of abrupt changes and the role of high vs. low latitudes as the drivers of climate change invoke sea ice as a principle cause of variability, but to date there have been no reliable proxies of past sea ice extent. Understanding the role of sea ice in past changes also critically impacts our understanding of the consequences of future changes in Arctic sea ice cover. This research calibrates and applies a set of new organic biomarkers (IP25 sea ice index, and TEX86 temperature index) to reconstruct changes in sea ice and associated sea surface temperatures from a series of high sedimentation rate cores from the Bering and Chukchi Seas. Specifically, the researchers will 1) produce a high latitude spatial dataset of relative IP25 concentrations and compare the distribution of these compounds with modern sea ice extent, 2) generate a new database of biomarker distributions in surface sediments from high-latitude oceans and compare with known SST variations, and 3) reconstruct past changes in seasonal sea ice and associated sea surface temperatures during the late glacial and Holocene from selected high latitude sites. In addition to the societal relevance of better understanding the role of sea ice extent in climate change, broader impacts include support of a PhD student, summer research projects for undergraduates, and a new faculty member at the University of Texas at Austin.

重建过去的海冰覆盖是古海洋学/古气候研究的一个基本挑战。突变的概念和数值模型以及高纬度和低纬度作为气候变化驱动因素的作用都将海冰作为变化的主要原因，但迄今为止，还没有可靠的过去海冰范围的替代物。了解海冰在过去变化中的作用也严重影响了我们对北极海冰覆盖未来变化后果的理解。这项研究校准和应用一套新的有机生物标志物（IP 25海冰指数和TEX 86温度指数），从白令海和楚科奇海的一系列高沉积速率岩心中重建海冰和相关海面温度的变化。具体来说，研究人员将1）生成一个高纬度的IP 25相对浓度空间数据集，并将这些化合物的分布与现代海冰范围进行比较，2）生成一个新的高纬度海洋表层沉积物生物标志物分布数据库，并与已知的SST变化进行比较，（3）从选定的高纬度地点重建晚冰期和全新世期间季节性海冰和相关海面温度的过去变化。除了更好地了解海冰范围在气候变化中的作用的社会意义外，更广泛的影响包括对博士生的支持，本科生的夏季研究项目，以及德克萨斯大学奥斯汀分校的新教员。