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Microfossils as indicators of aquatic ecosystem evolution and monsoon dynamics

微化石作为水生生态系统演化和季风动态的指标

基本信息

批准号：
202964542
负责人：
Professor Dr. Peter Frenzel
金额：
--
依托单位：
Helmholtz-Zentrum hereon GmbH
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/202964542?language=en
关键词：
Microfossils indicators aquatic ecosystem evolution

项目摘要

During the 3rd funding period (36 months) we propose to (1) perform coupled actualistic-ecological, taxonomic, and biogeographic analysis of Recent ostracodes from the Tibetan Plateau (TP), to (2) use species assemblages, trace elements and stable isotope signatures of ostracode shells to detect lake level changes in response to monsoon dynamics, melt water supply, variations in precipitation vs. evaporation ratios, and temperature at (2a) annual to decadal resolution for the past approx. 1000 years from the Tangra Yumco lake system, Taro Co, Npen Co, and one to two lakes of the Yushu region, as well as at (2b) decadal to centennial resolution from lakes Tangra Yum Co, Taro Co, Heihai, and Xingxinghai to assess long-term environmental changes and short-term events during the late Pleistocene and Holocene. Lake sites are strategically selected on the southern and northern TP in order to detect individual monsoonal air mass impact through space and time. The environmental interpretation of fossil ostracode assemblages will be based on ecological tolerances, preferences and transfer functions that will (3) be tested for applicability to pre-LGM ostracode assemblages. Emphasis will be given to the establishment of new trace element proxies from ostracode shells and the quantification of ostracode species assemblage data. An (4) inter-lake synthesis of proxy data reflecting the regional imprint of specific monsoonal air masses will be compared with results based on statistical downscaling for the last 7 ka to ultimately decipher drivers of Holocene monsoon dynamics.

在第三个供资期间（36个月）我们建议（1）对青藏高原（TP）现代介形虫进行现实生态学、分类学和地理学的耦合分析;（2）利用介形虫壳体的物种组合、微量元素和稳定同位素特征来检测湖泊水位变化对季风动力学、融水供应、降水与蒸发率变化的响应，和温度在（2a）年至十年分辨率为过去约。从Tangra Yumco湖泊系统、Taro Co、Npen Co和玉树地区的一到两个湖泊获得1000年的数据，以及从Tangra Yum Co、Taro Co、Heihai和Xingxinghai获得的10年到100年的数据，以评估晚更新世和全新世期间的长期环境变化和短期事件。在TP的南部和北方战略性地选择湖泊站点，以便通过空间和时间来检测单个季风气团的影响。化石介形虫组合的环境解释将基于生态容忍度、偏好和传递函数，这些函数将（3）测试对前末次冰期介形虫组合的适用性。重点将是介形虫壳中新的微量元素替代物的建立和介形虫种组合数据的定量化。将反映特定季风气团的区域印记的代理数据的（4）湖间综合与基于过去7 ka的统计降尺度的结果进行比较，以最终破译全新世季风动力学的驱动因素。