Vegetational and Climatic Histories of Central Alaska Duringthe Late Pleistocene

本研究旨在1）描述中部的植被历史 阿拉斯加14，000 - 125，000年B. P.; 2)重建过去的气候 根据孢粉学和地质学资料， 将这些古气候重建与 阿拉斯加气候基于全球气候的计算机模拟。 的 根据新的孢粉学资料描述植物的历史 结合以往的古环境研究成果。 响应 指示种的表面分析和自身生态要求 将被用来从花粉记录中推断过去的气候。 全局模拟，以各种边界组合运行 控制，将形成区域古气候建模的基础， 阿拉斯加 将进行数据模型比较，以评估 模拟和古气候记录之间的对应关系 阿拉斯加 该项目的成果将大大扩大 对气候变化期间高纬度地区环境变化的认识 晚更新世，并将提供一个难得的机会，检查数据- 在很长一段时间内进行模型比较。 这样的考试， 对评估预测气候变化响应的能力至关重要， 和陆地系统对未来边界控制变化的影响。

This research seeks to 1) describe the vegetational history of central Alaska between 14,000 and 125,000 yr B.P.; 2) reconstruct past climate during this period based on palynological and geological data; and 3) compare these paleoclimatic reconstructions with a regional model of Alaska climate based on computer simulations of global climate. The vegatation history will be described from new palynological data coupled with results of previous paleoenvironmental studies. Response surface analyses and autoecological requirements of indicator species will be used to infer past climate from the pollen records. Global simulations, run with various combinations of boundary controls, will form the basis for modeling regional paleoclimates for Alaska. Data-model comparisons will be done to assess the correspondence between simulations and paleoclimatic records in Alaska. The results of this project will significantly expand the understanding of environmental change at high latitudes during the late Pleistocene and will provide a rare opportunity to examine data- model comparisons over a long period of time. Such an examination is essential for evaluating the ability to predict responses of climatic and terrestrial systems to future variations in boundary controls.