Lake system response of Nam Co area, central Tibet, to Late Quaternary Monsoon dynamics: Microfossils as recorders of environmental change

西藏中部纳木错地区湖泊系统对晚第四纪季风动力学的响应：微化石作为环境变化的记录者

• 批准号: 14456666
• 负责人: Professorin Dr. Antje Schwalb
• 金额: --
• 依托单位: Institut für Geosysteme und Bioindikation
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/14456666?language=en
• 关键词: Lake; system; response; Nam; Co

In August/September 2005, during the pilot phase of this project, we have carried out a limnological survey that included the collection of water column samples from Nam Co, water samples from tributaries, surface sediments and short cores. Long cores (max. 4.7 m) and outcrop sediments were collected in cooperation with partners. Preliminary analyses show that there are abundant microfossils, especially ostracodes that document the suitability of Nam Co sediments for an evaluation of the response of Nam Co and its catchment area to environmental dynamics and climate change. This proposal seeks funding for a detailed microfossil analysis of sediment cores and outcrop sediments in order to characterize the lake system response to climate change during (1) recent decades, and (2) during the Holocene, as well as to characterize the (3) dynamics of past lake level high stands. Fossil ostracode species assemblages and the oxygen and carbon isotopic signatures from their valves will provide information about, for example, the precipitation vs. evaporation ratio, lake level changes and water supply to the lake such as meltwater runoff that is controlled by monsoon dynamics and temperature. We also plan to carry out a second field work phase at Nam Co followed by an exploratory survey in S. Tibet together with cooperation partners.

2005年8月/9月，在该项目的试验阶段，我们进行了一次湖沼调查，包括从纳木错采集水柱样本、从支流采集水样、表层沉积物和短岩心。长芯（最大）4.7 m）和露头沉积物。初步分析表明，有丰富的微体化石，特别是介形类，文件纳木错沉积物的纳木错及其集水区的环境动态和气候变化的响应进行评估的适用性。该提案寻求资助，对沉积物岩心和露头沉积物进行详细的微化石分析，以描述湖泊系统对（1）最近几十年和（2）全新世气候变化的反应，以及描述（3）过去湖泊水位高位的动态。化石介形虫物种组合及其阀的氧和碳同位素特征将提供有关以下方面的信息：例如，降水与蒸发率、湖泊水位变化和湖泊供水，如受季风动力学和温度控制的融水径流。我们还计划在纳木错进行第二阶段的实地工作，然后在南苏丹进行探索性调查。西藏与合作伙伴。