A carbon mass-balance budget for a periglacial catchment in West Greenland - Linking the terrestrial and aquatic systems
| Autor: | Ulrik Kautsky, Johan Rydberg, Hjalmar Laudon, Tobias Lindborg, Emma Lindborg, Gustav Sohlenius, Eva Andersson, Sten Berglund, Peter Saetre, Anders Löfgren |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Climate Research 010504 meteorology & atmospheric sciences Drainage basin chemistry.chemical_element Climate change Oceanography Hydrology Water Resources 010501 environmental sciences 01 natural sciences Carbon cycle Carbon-budget Environmental Chemistry Whole catchment Waste Management and Disposal 0105 earth and related environmental sciences geography geography.geographical_feature_category Aquatic ecosystem Terrestrial Dry periglacial landscape Miljövetenskap Pollution Aquatic chemistry Arctic Physical Geography Environmental science Physical geography Balance budget Carbon Environmental Sciences |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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