Climatic and Vegetational Oscillations During the Last Glacial-Interglacial Transition in Alaska

小行星9619583 来自环北大西洋和地球仪其他地区的令人信服的证据表明，在最后一次冰期-间冰期过渡期间，气候变暖被短暂的近冰期逆转所打断。 在阿拉斯加，来自分散地点的古生态和稳定同位素数据强烈表明，在LGIT期间存在短暂的气候事件。 该PALE/ARCSS奖项支持一个项目，通过分析阿拉斯加三个子区域湖泊沉积物岩心中的一套代用指标，获得LGIT期间植被和气候的高时间分辨率记录。 植被重建将以花粉、孢子和植物宏体化石记录为基础，辅以碳含量和磁化率地层学。 这些代理的互补性将允许最合理的古环境情景的识别。 该项目的结果将用于评估阿拉斯加LGIT期间气候和植被振荡的时间、地理范围、特征和幅度。 作为PALE纵向（环北极）数据库和PEP-I纬度数据库的一部分，该项目的古记录应提供对北太平洋高纬度地区与全球气候系统的联系以及造成气候突变的机制的深入了解。

9619583 Hu Evidence is compelling from the circum-North Atlantic and from other parts of the globe that climatic warming during the last glacial-interglacial transition (LGIT) was punctuated by short-lived reversals to near-glacial conditions. In Alaska paleoecological and stable-isotope data from scattered sites strongly suggest the existence of short-lived climatic events during the LGIT. This PALE/ARCSS award supports a project to acquire high-temporal resolution records of vegetation and climate during the LGIT by analyzing a suite of proxy indicators in sediment cores from lakes across three sub-regions of Alaska. Vegetational reconstructions will be based on pollen, spore, and plant-macrofossil records supplemented by carbon-content and magnetic-susceptibility stratigraphies. The complementary properties of these proxies will allow the identification of the most plausible paleoenvironmental scenarios. The results from this project will be used to assess the timing, geographic extent, character, and magnitude of climatic and vegetational oscillations during the LGIT in Alaska. As part of the longitudinal (circumarctic) database from PALE and the latitudinal database form PEP-I, paleorecords from this project should offer insights into the linkages of North Pacific high-latitudes to the global climate system and the mechanisms causing abrupt climatic changes.