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Microbiological and biogeochemical investigations of the microbial driven methane dynamic in the Siberian Arctic during glacial-interglacial climate changes

冰期-间冰期气候变化期间西伯利亚北极微生物驱动的甲烷动力学的微生物和生物地球化学研究

基本信息

批准号：
167409670
负责人：
Dr. Kai Mangelsdorf
金额：
--
依托单位：
Sektion 3.2: Organische Geochemie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/167409670?language=en
关键词：
Microbiological biogeochemical investigations microbial driven

项目摘要

The currently observed climate change due to global warming is expected to have a strong impact especially on the Arctic permafrost environments. The thawing of permafrost is suggested to be associated with a massive release of greenhouse gases, in particular methane. Thus, Arctic permafrost regions play a fundamental role within the global carbon cycle and the future development of the Earth’s climate. For the understanding how the system will respond to climate changes it is not only important to investigate the current status of carbon turnover but also how the system reacted to climate changes in the past. Therefore, in the proposed project the microbial driven methane dynamic in Arctic wetlands of Northeast Siberia during glacial-interglacial climate changes will be investigated. For this purpose a combined stratigraphic analyses of microbial lipid markers and ribosomal RNA will be applied on permafrost and lake sediments of Late Pleistocene to Holocene age. The permafrost and lake sediments were recovered from the El’gygytgyn Lake region in the scope of the ICDP project “Scientific Drilling at El’gygytgyn Crater Lake” from November 2008 to May 2009. The El’gygytgyn Lake represents an ideal case study because the region was unglaciated since the time of the meteorite impact. Thus, the sediments in this region archive several climatic stages during its development and it is expected that climatically induced chemical and physical changes in the sedimentary sequences results in variations of the microbial communities concomitantly affecting the methane gas fluxes in the past. The acquired data will deepen our knowledge on the variations within the microbial communities during climate changes and the effect of these changes on the microbial driven methane cycling.

目前观察到的全球变暖造成的气候变化预计将产生重大影响，特别是对北极永久冻土环境的影响。永久冻土的融化被认为与温室气体的大量释放有关，特别是甲烷。因此，北极永久冻土区在全球碳循环和地球气候未来发展中发挥着基础性作用。为了了解该系统将如何应对气候变化，不仅要调查碳周转的现状，而且要调查该系统过去对气候变化的反应情况。因此，在拟议的项目中，将研究冰期-间冰期气候变化期间西伯利亚东北北极湿地微生物驱动的甲烷动态。为此，将对晚更新世至全新世的永冻土和湖泊沉积物进行微生物脂标记物和核糖体RNA的联合地层学分析。多年冻土和湖泊沉积物是在2008年11月至2009年5月在国际地球物理中心“在埃尔盖京火山口湖进行科学钻探”项目范围内从El‘gytgyn湖地区恢复的。El‘gytgyn湖是一个理想的案例研究，因为该地区自陨石撞击以来就没有冰川。因此，该地区的沉积物在其发育过程中记录了几个气候阶段，预计气候诱导的沉积序列的化学和物理变化导致微生物群落的变化，从而影响过去的甲烷气体通量。获得的数据将加深我们对气候变化期间微生物群落内部变化以及这些变化对微生物驱动的甲烷循环的影响的知识。