Late Quaternary Climatic and Vegetation History of the Alaskan North Slope: Part II, Analysis of Paleo Records

题目：阿拉斯加北坡晚第四纪气候与植被史；白令陆桥（加拿大西北部、阿拉斯加和西伯利亚东北部）是美国国家科学基金会（NSF）“北极湖泊和河口古气候”（PALE）项目中一个重要的古气候研究区域，因为它在晚第四纪期间一直未被冰川覆盖，并且由于海平面的变化而经历了广泛的古地理变化。本研究旨在通过分析阿拉斯加北坡一套湖泊沉积物岩心的代用气候指标，描述北坡晚第四纪气候历史（距今约15万年）。研究将：1)描述花粉、孢子、植物宏观化石和选定的地球化学性质的时空变化；2)从代理指标解释古气候变化（使用分析方法和大型现代校准数据集来解释花粉数据）；3)利用东白令陆桥气候大尺度控制的概念框架和作为正在进行的PALE古气候项目的一部分的气候模式模拟，推断古气候变化的潜在原因。拟议的研究结果将直接有助于PALE记录环北极古气候变化的目标。

Abstract ATM-9423392 Brubaker,Linda B. University of Washington Title: Late Quaternary Climatic and Vegetation History of the Alaskan North Slope: Part II, Analysis of Paleo Records Beringia (far northwest Canada, Alaska, and northeast Siberia) is an important region of paleoclimate study for the NSF program Paleoclimate of Arctic Lakes and Estuaries (PALE) because it remained unglaciated during the late Quaternary and experienced extensive changes in paleogeography due to changing sea levels. This research is designed to describe the late Quaternary climate history of the North Slope (ca. 150,000 years BP to present) through the analysis of proxy climate indicators in a suite of lake sediment cores on the Alaskan North Slope. The research will: 1) describe temporal and spatial variations in the pollen, spores, plant macrofossils and selected geochemical properties, 2) interpret variations in paleoclimate from proxy indicators (using analytical approaches and large modern calibration data sets for the interpretation of pollen data), and 3) infer potential causes of paleoclimatic variations using a conceptual framework of large scale controls of eastern Beringian climate and climate model simulations as part of ongoing PALE paleoclimate projects. Results of the proposed research will contribute directly to PALE's goal of documenting circumarctic paleoclimate variability.