Late Quaternary Paleoclimate History from Saline Lakes of the Arid Andes, 23-26 Degrees South-Paleohydrology and Geochemical Proxies

提要：ATM-9709786 Lowenstein，纽约州立大学Binghamton ATM-9709771约旦，Teresa E.Cornell大学标题：来自干旱安第斯盐湖的晚第四纪古气候史，23-260o南古水文学和地球化学指标该奖项将支持从干旱副热带高压安第斯山脉封闭的排水盆地中含蒸发岩的沉积物岩心中提取气候指标的研究。阿塔卡马盐田(Salar)(安第斯山脉西侧海拔2300米)的100米长岩心可供详细研究，邻近普纳高原(海拔3800米以上)的Rincon和Hombre Muerto Salars岩心也将得到评估。该地区的降水在很大程度上与起源于西风带的亚马逊季风系统和锋面系统的行为有关。整个热带和亚热带南美洲气候的时间变化，包括普纳/阿塔卡马沙漠地区的降水变化，与ENSO模式有关。阿塔卡马/普纳地区的古气候波动将反映所有控制因素的位置和强度的变化，但受过去ENSO活动的强度和持续时间的支配。古气候记录将从封闭的盆地沉积物中恢复，这些沉积物保存了气候变化和盆地流入与蒸发比率变化的敏感记录。

Abstract ATM-9709786 Lowenstein, Tim K. State University of New York at Binghamton ATM-9709771 Jordan, Teresa E. Cornell University Title: Late Quaternary Paleoclimate History from Saline Lakes of the Arid Andes, 23-26o South - Paleohydrology and Geochemical Proxies This award will support the investigation of climate proxies from evaporite-bearing sediment cores in closed drainage basins of the arid subtropical high Andes. A 100-m-long core from the Atacama salt pan (salar) (2300 m elevation on western flank of the Andes) is available for detailed study, and cores from Rincon and Hombre Muerto salars in the neighboring Puna plateau (elevations above 3800 m) will also be evaluated. Precipitation in the region is largely related to the behavior of the Amazonian monsoonal system and frontal systems sourced in the westerlies. Temporal variability in climate throughout tropical and subtropical South America, including precipitation variations in the Puna/Atacama desert region, is related to ENSO patterns. Paleoclimate fluctuations in the Atacama/Puna region would reflect changes in positions and strengths of all controlling factors, but dominated by the intensity and duration of past ENSO activity. The paleoclimate record will be retrieved from closed basin sediments, which preserve a sensitive record of climate change and variations in ratio of basin inflow to evaporation.