Elemental and Isotopic Composition of Trapped Gases in the Huascaran and Sajama Ice Cores from South America

摘要ATM-9618067 Sowers，托德宾夕法尼亚州立大学标题：南美洲瓦斯卡兰和萨贾马冰芯中捕获气体的元素和同位素组成 从秘鲁科迪勒拉山脉的瓦斯卡兰冰芯中，我们获得了一组非常令人兴奋的气候记录，这些记录一直延续到末次冰期。 这个岩芯的同位素温度记录表明，在末次冰期，瓦斯卡兰的温度比今天更低，支持了其他各种证据，证明热带地区在末次冰期确实更冷。 这些发现与格陵兰岛和南极洲的冰芯记录一致，这些记录一直延续到末次冰期。 在冰川终止期间所有这些记录之间的高度协变认为，这些网站之间有很强的遥相关，可能是响应相同（或相似）的强迫功能。 该奖项支持测量瓦斯卡兰冰芯中被困气体的元素和同位素组成。 这些记录将为瓦斯卡兰冰川时代的冰的存在提供明确的证据。 气体记录将使瓦斯卡兰冰芯的时间尺度精确到格陵兰中部GISP II冰芯的500年以内。 气体记录也将允许将瓦斯卡兰气候记录转移到一个“共同的时间框架”中。“此外，可以调查所有这些气候记录和涵盖最后一次冰川消退的许多其他记录之间的领先和滞后。 本研究的最终目标是通过建立导致冰川消退的事件序列来深入了解导致地球走出末次冰期的机制。 将瓦斯卡兰的热带气候事件放在这个序列中将有助于解释导致最后一次终止的强迫机制的性质。

Abstract ATM-9618067 Sowers, Todd Pennsylvania State University Title: Element and Isotopic Composition of Trapped Gases in the Huascaran and Sajama Ice Cores from South America A set of very exciting climate records extending into the last glacial period have been developed from the Huascaran ice core from the Peruvian Cordillera. The isotopic temperature record from this core demonstrated that, during the last glacial period, temperatures at Huascaran were colder than today, supporting various other lines of evidence that the tropics were indeed colder during the last glacial period. These findings are consistent with ice core records from Greenland and Antarctica which extend into the last glacial period. The high degree of covariation between all these records during the Glacier termination argues that there are strong teleconnections between these sites which are probably responding to the same (or similar) forcing functions. This award supports measurements of the elements and isotopic composition of the trapped gases in the Huascaran ice core. These records will provide definitive evidence for the existence of glacial-age ice at Huascaran. The gas records will refine the timescale for the Huascaran core to within 500 years of that ascribed to the GISP II ice core from central Greenland. The gas records will also allow the transfer of the Huascaran climate records into a "common temporal framework." In addition, leads and lags between all these climate records and many other records covering the last deglaciation can be investigated. The ultimate goal in this research is to gain insight into the mechanisms which caused the Earth to move out of the last glacial period by establishing the sequence of events which led to the deglaciation. Placing the tropical climate events from Huascaran in this sequence will help decipher the nature of the forcing mechanisms responsible for the last termination.