Ground ice and biogeochemistry of permafrost: environmental consequences of permafrost degradation to a warmer-wetter climate.

地冰和永久冻土的生物地球化学：永久冻土退化对温暖湿润气候的环境影响。

基本信息

批准号：
RGPIN-2017-03997
负责人：
Lacelle, Denis
金额：
$ 1.97万
依托单位：
University of Ottawa
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2019
资助国家：
加拿大
起止时间：
2019-01-01 至 2020-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681854
关键词：
Ground ice biogeochemistry permafrost environmental

项目摘要

Permafrost occupies 40-50% of Canada's landmass and plays a crucial role in cold-climate environments. Ice-rich permafrost environments are destabilizing and may undergo substantial modification as landscapes adjust to changing climate. These changing permafrost conditions are expected to have a significant effect on both terrestrial and aquatic ecosystems, and are also directly impacting human activities in the Canadian Arctic. Finally, changes to permafrost enhance global warming due to the release of trapped greenhouse gases and mineralization of soil organic carbon in the thawing permafrost.***The long-term goal of my research program is to understand and explain the physical and (bio)geochemical processes that shape(d) and define(d) permafrost environments during the past, present and future. Specifically, the objectives of this proposal are to: 1) investigate the distribution, origin and age of ice-rich permafrost in Arctic Canada and the response of these landscapes to warmer-wetter climate; and 2) investigate the biogeochemistry between the various layers of permafrost and for various landforms and their relation to thermal and moisture conditions. The research will be conducted at sites ranging from the low Arctic to the high Arctic. The research activities will involve the training of 13 students in field-based multi-disciplinary permafrost studies and the result will contribute to an in-depth understanding of the dynamics of ground ice and biogeochemistry permafrost under a range of climate, landforms and ecosystems. The proposed project is creative and original because it addresses fundamental data and knowledge gaps that are highly relevant to understanding how climate change and associated shifts in climate and ecological zones may impact processes occurring in permafrost systems. The research results will be directly relevant to northern communities, decision-makers and global climate modelers as we adapt to a changing world.

永久冻土占加拿大道路的40-50％，在冷气候环境中起着至关重要的作用。富含冰块的永久冻土环境正在稳定，随着景观适应气候变化，可能会进行实质性的修改。预计这些变化的多年冻土条件将对陆地和水生生态系统产生重大影响，并且也直接影响加拿大北极的人类活动。最后，由于释放了被困的温室气体和土壤有机碳在融化的多年冻土中的矿化，对永久冻土的变化增强了全球变暖。***我的研究计划的长期目标是理解和解释物理和（BIO）在过去，现在和将来，地球化学过程（d）和定义（d）多年冻土环境。具体而言，该提案的目标是：1）研究加拿大北极冰冻冰冻冰冻的分布，起源和年龄，以及这些景观对较温暖的气候的反应； 2）研究多年冻土的各个层与各种地形之间的生物地球化学及其与热和水分条件的关系。这项研究将在从低北极到高北极的地点进行。研究活动将涉及对13名学生进行基于现场的多学科多年冻土研究的培训，结果将有助于深入了解地面冰和生物地球化学在多种气候，地面和生态系统下的动态。拟议的项目具有创造力和原始性，因为它解决了与了解气候变化和气候变化和相关的气候和生态区域的相关转变高度相关的基本数据和知识差距。当我们适应不断变化的世界时，研究结果将与北方社区，决策者和全球气候建模者直接相关。