Holocene Paleohydrology of the Subtropical Andes from Lake Records

摘要ATM-9613991 Seltzer，Geoffrey O. 锡拉丘兹大学 标题：从湖泊记录看亚热带安第斯山脉全新世古水文学 该项目的主要目标是建立新的多代理全新世古气候记录从亚热带安第斯山脉。 以前的工作表明，在全新世中期的干旱期延长，然而，更多的工作，以产生硅藻和同位素记录是必要的，以证实这一假设，并确定这一干燥阶段的程度。 具体而言，该奖项将支持一项研究，以确定安第斯高原在全新世十年至世纪时间尺度上降水蒸发平衡变化的时间。 需要这些记录来了解亚热带地区的长期大气动力学，并评估夏季对流强度的十年到千年尺度变化的重要性。 全新世气候的历史，该地区将重建通过分析沉积物，地球化学，磁性，同位素，硅藻含量的湖芯在高分辨率的210铅和AMS 14 C测量。 将对玻利维亚科迪勒拉东部大约15 °至20 ° S范围内的一个样带进行调查。 这样一个有效湿度变化的记录将为亚热带南美洲的长期气候变率提供深入的了解。 水资源的变化也可能对生活在高原上的史前人类产生重大影响，并可能再次成为该地区未来人口的重要环境因素。

Abstract ATM-9613991 Seltzer, Geoffrey O. Syracuse University Title: Holocene Paleohydrology of the Subtropical Andes from Lake Records The primary objective of this project is to establish new multi- proxy Holocene paleoclimate records from the subtropical Andes. Previous work suggests a prolonged period of aridity during the mid-Holocene, however, more work to produce diatom and isotope records is necessary to confirm this hypothesis and determine the extent of this dry phase. Specifically, this award will support a study to define the timing of changes in the precipitation- evaporation balance of the Andean Altiplano on a decadal to century timescale for the Holocene. These records are needed to understand the long-term atmospheric dynamics of the subtropics and to assess the importance of decadal to millennial-scale shifts in the strength of summer convection. The Holocene climate history of the region will be reconstructed by analyzing the sediment, geochemical, magnetic, isotopic, and diatom content of lake cores dated at high-resolution by 210Pb and AMS 14C measurements. A transect of sites ranging from approximately 15o to 20oS in the eastern cordillera of Bolivia will be investigated. Such a record of changing effective moisture will provide insight into the long- term climate variability of subtropical South America. Changes in water resources may have also significantly impacted prehistoric people living on the Altiplano and may again be an important environmental factor for future populations in the region.