Quaternary Paleoclimatic Record from Tropical South America: Lake Titicaca

南美洲热带地区第四纪古气候记录：的的喀喀湖

• 批准号: 9619672
• 负责人: Paul Baker
• 金额: $ 15.94万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9619672&HistoricalAwards=false
• 关键词: Quaternary; Paleoclimatic; Record; Tropical; South

Abstract ATM-9616972 Baker, Paul A. Duke University ATM-9708257 Dunbar, Robert B. William Marsh Rice University ATM-9708256 Fritz, Sherilyn C. LeHigh University ATM-9708258 Seltzer, Geoffrey Syracuse University Title: Quaternary Paleoclimate Record from South America: Lake Titicaca A long and continuous paleoclimate record from tropical South America is needed to answer several persistent and important questions. This award supports the recovery of such a record by coring the deep basin of Lake Titicaca on the northern Altiplano of Peru and Bolivia. Through the preliminary analysis of a series of short, mini-piston cores, it is demonstrated that the sediments of the lake are suitable for climatic reconstruction. Previous studies revealed large-amplitude fluctuations of lake level in the Holocene and Pleistocene, implying that effective moisture (and probably temperature) has dramatically fluctuated. Siting of a series of long cores will be aided by medium-resolution, deeper penetration seismic reflection profiling. The cores will be subsequently analyzed for chronology (AMS radiocarbon), sedimentology, physical properties, geochemistry, stable isotopic analysis of organic carbon and cellulose; determination of organic and inorganic phosphorous, and biogenic silica; and paleobiota (ostracode and diatom species compositions), This record will allow us to examine in detail the timing and mechanisms of tropical forcing of high-latitude climate, as well as the linkage between the climate of the Altiplano and the Amazon basin.

摘要 ATM-9616972 Baker, Paul A. 杜克大学 ATM-9708257 Dunbar, Robert B. William Marsh Rice 大学 ATM-9708256 Fritz, Sherilyn C. LeHigh 大学 ATM-9708258 Seltzer, Geoffrey Syracuse 大学 标题：来自南美洲的第四纪古气候记录：的的喀喀湖 来自热带地区的长期连续古气候记录 南美洲需要回答几个长期存在的重要问题。 该奖项通过对秘鲁和玻利维亚高原北部的的喀喀湖深盆地取芯来支持恢复这一记录。 通过对一系列短小活塞岩心的初步分析，证明该湖的沉积物适合气候重建。 先前的研究揭示了全新世和更新世湖泊水位的大幅波动，这意味着有效水分（可能还有温度）发生了剧烈波动。 中等分辨率、更深穿透的地震反射剖面将有助于一系列长岩心的选址。 随后将对岩心进行年代学（AMS 放射性碳）、沉积学、物理性质、地球化学、有机碳和纤维素的稳定同位素分析；有机和无机磷以及生物二氧化硅的测定；和古生物群（介形类和硅藻物种组成），该记录将使我们能够详细研究高纬度气候的热带强迫的时间和机制，以及高原和亚马逊盆地气候之间的联系。