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

摘要ATM-9709786 Lowenstein，Tim K. 纽约宾汉姆顿州立大学 作者：Jordan，Teresa E. 康奈尔大学标题：南23- 26 °干旱安第斯山脉盐湖的晚第四纪古气候历史--古水文学和地球化学指标 该奖项将支持从干旱的副热带高压安第斯山脉封闭流域的含砷铁矿沉积物岩心中调查气候代用指标。 阿塔卡马盐沼（salar）（安第斯山脉西侧海拔2300米）的100米长岩心可用于详细研究，邻近普纳高原（海拔3800米以上）的Rincon和Hombre Muerto salar的岩心也将进行评估。 在该地区的降水在很大程度上与亚马逊季风系统和西风带的锋面系统的行为有关。 整个南美洲热带和亚热带气候的时间变化，包括普纳/阿塔卡马沙漠地区的降水变化，都与厄尔尼诺/南方涛动模式有关。 阿塔卡马/普纳地区的古气候波动反映了所有控制因子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。 将从封闭盆地沉积物中检索古气候记录，这些沉积物保存了气候变化和盆地流入量与蒸发量之比变化的敏感记录。

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.