Multivariate Paleoclimatic Analysis in Southern South America with Emphasis on Transitional Periods

摘要ATM-9321857 Markstan，Vera白色，James W.C. 科罗拉多大学题目：南美洲南部多变量古气候分析，强调过渡时期 该奖项支持多变量古气候研究，使用花粉和稳定同位素分析，从南美洲南部的泥炭芯。 这些岩心被认为包含了自末次冰期/间冰期过渡以来的连续记录。 迄今为止，从一个泥炭芯，在纬度55 °的比格尔海峡的高分辨率分析相结合的结果表明，花粉地层学提供的角度来看，稳定同位素比可以更好地进行评估，并结合的方法大大增强了古气候信息。 目前的努力有三个方面的目标：1）通过对苔藓的实验室研究和对现代沼泽的深入野外研究来完善稳定同位素数据的校准：2）通过用同样的方法分析来自同一气候区的其他记录来确认古气候变化的历史; 3）通过分析南美洲南部不同地区以及北方的其他记录，确认pCO 2过去变化的记录。 将几个岩心的古气候和古二氧化碳浓度记录结合起来，将有助于更好地了解气候突变事件的机制和动态。

Abstract ATM-9321857 Markgraf, Vera White, James W.C. University of Colorado Title: Multivariate Paleoclimatic Analysis in Southern South America with Emphasis on Transitional Periods This award supports a multivariate paleoclimate study, using pollen and stable isotope analyses, of peat cores from southern South America. These cores are believed to contain a continuous record since the last glacial/interglacial transition. Results obtained to date from the combined high resolution analyses of one peat core, at latitude 55o in the Beagle Channel, indicate that the pollen stratigraphy provides the perspective against which stable isotope ratios can be better evaluated and that the combined approach greatly augments the paleoclimatic information. The goal of the present effort is threefold: 1) refine the calibration of the stable isotope data by both experimental laboratory studies with mosses and indepth field studies of modern bogs; 2) confirm the history of paleoclimatic change by analyzing other records from the same general climatic region using the same approach; and 3) confirm record of past changes in pCO2 by analyzing other records from different regions in southern South America and also from the northern hemisphere. The combination of records of paleoclimatic and paleo-carbon dioxide concentrations from several cores will lead to a better understanding of the mechanisms and dynamics of abrupt climate change events.