Ultrahigh resolution dissolved organic matter characterization reveals distinct permafrost characteristics on the Peel Plateau, Canada

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2023-12-06 DOI:10.1007/s10533-023-01101-3
M. R. N. Moore, S. E. Tank, M. R. Kurek, M. Taskovic, A. M. McKenna, J. L. J. Smith, S. V. Kokelj, R. G. M. Spencer
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Abstract

The Arctic is warming at a rate twice that of other global ecosystems and changing climate conditions in the Arctic are mobilizing long frozen permafrost stores of organic carbon. In ice-rich regions, permafrost thaw on sloping terrain can cause land subsidence, and the development of thaw-driven mass wasting. The Peel Plateau, Northwest Territories, Canada has extensive thaw-driven landslides called retrogressive thaw slumps that are exposing early Holocene age paleo-thaw layers and Pleistocene age glaciogenic material deposited by the Laurentide Ice Sheet. This study aimed to see if unique retrogressive thaw slump derived permafrost inputs could be readily observed in streams across six diverse thermokarst features via optical and ultrahigh-resolution mass spectrometry. Aquatic samples from water draining thermokarst slump features, and downstream of thermokarst inputs exhibited higher dissolved organic carbon concentrations and lower aromaticity as evidenced by optical parameters (e.g. declining SUVA254, increasing S275-295) and FT-ICR MS metrics (e.g. lower AImod and nominal oxidation state of carbon) versus upstream of thermokarst impacts. Increases in the relative abundances of assigned heteroatomic molecular formulae (e.g. CHON, CHOS, CHONS) were also greater within and downstream of thermokarst features. The unique molecular formulae present in permafrost thermokarst inputs were determined (n = 1844) and subsequently tracked downstream. These permafrost marker formulae were enriched in aliphatics and H/C, as well as heteroatoms and exhibited low aromaticity. A portion of the unique molecular fingerprint persisted downstream, highlighting the potential to not only assess thermokarst inputs but also to follow these inputs and their fate downstream throughout the aquatic network.

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超高分辨率溶解有机质表征揭示了加拿大皮尔高原永久冻土的独特特征
北极的变暖速度是全球其他生态系统的两倍,北极不断变化的气候条件正在调动长期冻结的永久冻土中有机碳的储存。在富冰地区,斜坡地形上的永久冻土融化会引起地面沉降,并导致融化驱动的物质浪费的发展。加拿大西北地区的皮尔高原有广泛的由融化引起的滑坡,称为后退性融化滑坡,暴露出全新世早期的古融化层和更新世时期由劳伦泰德冰盖沉积的冰川物质。本研究旨在通过光学和超高分辨率质谱分析,了解是否可以在六种不同热岩溶特征的溪流中容易观察到独特的后退性融化坍落度引起的永久冻土输入。从光学参数(例如,SUVA254下降,S275-295增加)和FT-ICR质谱指标(例如,AImod和碳的名义氧化态降低)可以看出,与热岩溶影响的上游相比,来自排水热岩溶滑坡特征和热岩溶输入下游的水生样品表现出更高的溶解有机碳浓度和更低的芳香性。指定的杂原子分子式(如CHON, CHOS, CHONS)的相对丰度在热岩溶特征内部和下游也有较大的增加。确定了永久冻土热岩溶输入中存在的独特分子式(n = 1844),并随后追踪到下游。这些冻土带标志化合物富含脂肪族、氢碳比和杂原子,芳香性较低。部分独特的分子指纹在下游持续存在,突出了不仅可以评估热岩溶输入,还可以在整个水生网络中跟踪这些输入及其下游命运的潜力。
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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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