Isotope and Pollen Stratigraphy of Abrupt Late Glacial Climate Events in the Upper Midwest

自然气候和生态系统都可能突然对 渐进强迫 在晚冰期的时间窗口， 14,000年和10,000年BP， 几十年 本项目将审查综合记录 两个不同气候代理的近间隔样本， 在气候敏感的中西部， 五大湖以南的地区。 我们将使用稳定同位素 存在于湖泊沉积物碳酸盐中，作为几乎 区域降水变化的瞬时响应 模式. 我们将使用花粉沉积作为区域性的代表， 植被（和间接气候），给出一个时间记录 滞后 该地区包括俄亥俄州、印第安纳州、密歇根州和伊利诺斯州， 接受检查。 这些网站将允许直接比较响应 不同系统在两次变暖事件中的速率 在新仙女木时代， 血压10200

Both natural climate and ecosystems may respond abruptly to gradual forcings. During the late glacial time window between 14,000 and 10,000 years BP, large magnitude changes occurred within decades. This project will examine the records from integrated close-interval samples of two different climate proxies with different response rates in the climatically sensitive Midwest region south of the Great Lakes. We will use stable isotopes present in lake sediment carbonates as a proxy measure of almost instantaneous response to changes in regional precipitation patterns. We will use pollen deposition as a proxy for regional vegetation (and indirectly climate), giving a record with a time lag. The area including Ohio, Indiana, Michigan, and Illinois will be examined. These sites will allow direct comparison of response rate of different systems during the two warming events in the late glacial around 13,000 BP, and in the Younger Dryas Chron around 10,200 BP.