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

这项建议将资助开发一个连续的，同位素定年的古摇蚊和花粉记录的冰川期气候波动，从湖泊沉积物位于气候敏感的网站沿着南阿尔卑斯山，新西兰。将对边界流塔恩、沼泽塔恩和壶穴沼泽的末次冰期-间冰期过渡（LGIT）进行详细调查，以建立冰消期气候事件的序列，并便于与其他日期明确的北方和南方记录进行比较。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）所记录的变化是否显示出与北方半球的同相或异相关系;（3）南极的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。 详细的摇蚊分析，解释一个新开发的摇蚊温度传递函数，将进行沼泽塔恩和壶孔沼泽LGIT年龄沉积物和花粉分析将进行沼泽塔恩。该项目将为三名本科生提供进行独立研究的机会。该项目还将提高对全球古气候学的认识，并通过出版摇蚊化石照片索引，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.