Collaborative Research: Paleoenvironmental Changes in the Bolivian Altiplano: A High-Resolution Pollen Record from the Sajama Ice Cap

合作研究：玻利维亚高原的古环境变化：萨哈马冰盖的高分辨率花粉记录

• 批准号: 9906002
• 负责人: Kam-biu Liu
• 金额: $ 7.05万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9906002&HistoricalAwards=false
• 关键词: Collaborative; Research; Paleoenvironmental; Changes; Bolivian

This project seeks to produce a high-resolution pollen record of climatic and vegetational changes during the last 25,000 years from the Sajama ice cap in the Altiplano of Bolivia. Pollen preserved in ice cores retrieved from the Sajama ice cap will be analyzed at annual to decadal sampling resolutions to detect the response of the tropical Andean vegetation to century-scale climatic fluctuations occurring during the late-Holocene, such as the Little Ice Age, the Medieval Warm Period, and the regional drought events that episodically lowered the water levels in Lake Titicaca during the last 3500 years. The pollen data will also complement other paleoclimatic proxies to shed light on the vegetational response to abrupt climatic changes occurring during the Last Glacial Maximum and deglacial times, including a deglaciation climatic reversal about 14,000 to 11,500 years ago that is correlative with the North Atlantic Younger Dryas stadial.This research will be the first systematic pollen study of a tropical ice core. It will advance the field of ice-core palynology and will enhance the use of pollen as a paleoclimatic and paleoecological proxy in ice-core research. The 25,000-year pollen record from the Sajama ice cap will add to only one other continuous pollen record from the entire tropical Andes and western Amazonia south of the equator that contains information pertaining to the vegetation and climatic conditions of the Last Glacial Maximum. It will offer a unique opportunity to study the sensitivity of the tropical Andean vegetation to past and future climatic changes.

该项目旨在制作玻利维亚高原Sajama冰帽过去25 000年期间气候和植被变化的高分辨率花粉记录。 保存在冰芯从Sajama冰帽检索的花粉将进行分析，在每年到十年的采样分辨率，以检测热带安第斯植被的百年尺度的气候波动发生在晚全新世，如小冰期，中世纪温暖期，和区域干旱事件，在过去的喀喀湖的水位降低在过去的3500年的响应。 花粉数据还将补充其他古气候代用指标，以阐明植被对末次冰期最大期和冰消期发生的气候突变的反应，包括约14，000至11，500年前与北大西洋新仙女木stadial相关的冰消期气候逆转。 它将推动冰芯孢粉学领域的发展，并将加强利用花粉作为冰芯研究中的古气候和古生态代用指标。 萨哈马冰帽25 000年的花粉记录将增加另一个来自整个热带安第斯山脉和赤道以南的亚马逊西部的连续花粉记录，其中包含有关末次冰盛期植被和气候条件的信息。 它将为研究热带安第斯植被对过去和未来气候变化的敏感性提供一个独特的机会。