Determining Patterns of Abrupt Climate Change during the Last Glacial-Interglacial Transition (LGIT) in the Southern Hemisphere

这一建议将资助从位于新西兰南阿尔卑斯山气候敏感地点的湖泊沉积物中开发一个连续的、同位素定年的古摇针器和去冰期气候波动的花粉记录。将对边界溪塔恩、泥潭塔恩和壶洞沼泽的末次冰期-间冰期过渡（LGIT）进行详细的调查，以建立脱冰气候事件的序列，并便于与其他确定年代的南北记录进行比较。该项目的主要科学目标是确定：1)过去气候变化的模式和幅度；2)所记录的变化是否与北半球呈同相或非同相关系；3)南极特征是否延伸到西南太平洋地区。这些结果将有助于区分关于全球气候突变的可行假设。利用新建立的chironomid-temperature transfer function对泥潭Tarn和Kettlehole Bog进行详细的chironomid分析，并对泥潭Tarn进行年龄沉积物和花粉分析。该项目将为三名本科生提供进行独立研究的机会。该项目还将加强对全球古气候学的了解，并通过出版摇尾鱼化石的照片钥匙，为研究人员之间的合作提供机会。

This proposal will fund the development of a continuous, isotopically-dated paleochironomid and pollen record of deglacial climate fluctuations from lake sediments located in climatically sensitive sites along the Southern Alps, New Zealand. Detailed investigations will be carried out for the Last Glacial-Interglacial Transition (LGIT) at Boundary Stream Tarn, Quagmire Tarn, and Kettlehole Bog to establish the sequence of deglacial climate events and to facilitate comparisons with other well-dated northern and southern records. The primary scientific objectives of the project are to determine: 1) the pattern and magnitude of past climate change; 2) whether changes recorded show an in-phase or out-of-phase relationship with the Northern Hemisphere; and 3) whether the Antarctic signature extends into the southwest Pacific region. These results will facilitate differentiation among viable hypotheses concerning abrupt global climate change. Detailed chironomid analysis, interpreted by a newly developed chironomid-temperature transfer function, will be carried out on Quagmire Tarn and Kettlehole Bog LGIT-age sediment and pollen analysis will be conducted on Quagmire Tarn. This project will provide the opportunity for three undergraduate students to conduct independent research. The project will also enhance greater understanding in global paleoclimatology and provide opportunities for collaboration among researchers through the publication of a photographic key to fossil chironomids.