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A carbon mass-balance budget for a periglacial catchment in West Greenland - Linking the terrestrial and aquatic systems

Lindborg, Tobias and Rydberg, Johan and Andersson, Eva and Lofgren, Anders and Lindborg, Emma and Saetre, Peter and Sohlenius, Gustav and Berglund, Sten and Kautsky, Ulrik and Laudon, Hjalmar (2020). A carbon mass-balance budget for a periglacial catchment in West Greenland - Linking the terrestrial and aquatic systems. Science of the Total Environment. 711 , 1-19
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Abstract

Climate change is predicted to have far reaching consequences for the mobility of carbon in arctic landscapes. On a regional scale, carbon cycling is highly dependent on interactions between terrestrial and aquatic parts of a catchment. Despite this, studies that integrate the terrestrial and aquatic systems and study entire catchments using site-specific data are rare. In this work, we use data partly published by Lindborg et al. (2016a) to calculate a whole-catchment carbon mass-balance budget for a periglacial catchment in West Greenland. Our budget shows that terrestrial net primary production is the main input of carbon (99% of input), and that most carbon leaves the system through soil respiration (90% of total export/storage). The largest carbon pools are active layer soils (53% of total carbon stock or 13 kg C m (2)), permafrost soils (30% of total carbon stock or 7.6 kg C m (2)) and lake sediments (13% of total carbon stock or 10 kg C m (2)). Hydrological transport of carbon from the terrestrial to aquatic system is lower than in wetter climates, but the annual input of 4100 kg C yr (1) (or 3.5 g C m (2) yr (1)) that enters the lake via runoff is still three times larger than the eolian input of terrestrial carbon. Due to the dry conditions, the hydrological export of carbon from the catchment is limited (5% of aquatic export/storage or 0.1% of total export/storage). Instead, CO2 evasion from the lake surface and sediment burial accounts for 57% and 38% of aquatic export/storage, respectively (or 0.8% and 0.5% of total export/storage), and Two-Boat Lake acts as a net source of carbon to the atmosphere. The limited export of carbon to downstream water bodies make our study system different from wetter arctic environments, where hydrological transport is an important export pathway for carbon. (C) 2019 The Author(s). Published by Elsevier B.V.

Authors/Creators:Lindborg, Tobias and Rydberg, Johan and Andersson, Eva and Lofgren, Anders and Lindborg, Emma and Saetre, Peter and Sohlenius, Gustav and Berglund, Sten and Kautsky, Ulrik and Laudon, Hjalmar
Title:A carbon mass-balance budget for a periglacial catchment in West Greenland - Linking the terrestrial and aquatic systems
Year of publishing :2020
Volume:711
Page range:1-19
Number of Pages:19
Publisher:Elsevier
ISSN:0048-9697
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Physical Geography
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research
Keywords:Carbon-budget, Whole catchment, Dry periglacial landscape, Terrestrial, Aquatic
URN:NBN:urn:nbn:se:slu:epsilon-p-104655
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-104655
Additional ID:
Type of IDID
DOI10.1016/j.scitotenv.2019.134561
Web of Science (WoS)000509344700003
ID Code:16747
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:14 Apr 2020 11:54
Metadata Last Modified:18 Jul 2020 14:06

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