[en] AbstractInland waters in Arctic landscapes act as conduits of terrestrial organic material, transporting and processing organic material into the greenhouse gases (GHGs) carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), and subsequently exchanging these gases with the atmosphere. To assess the role of inland water emissions in the Arctic GHG budget, it is necessary to quantify their emissions in relation to the terrestrial sink capacity. We present measurements of dissolved CO2, CH4, and N2O from lake, pond, and low‐order fluvial systems across two summers (2016–2017) in the Arctic Siberian Indigirka River tundra lowlands. During May–July 2017, the region experienced large‐scale flooding, of which we captured the tail end. Using remote sensing images to upscale inland water emissions to an area of approximately 18 km2, we calculated combined carbon (C) emissions, CO2‐C, and diffusive CH4‐C under nonflood and flooded scenarios. These ranged from 7.03 ± 1.30 Mg C d−1 (nonflood; mean ± SD) to 9.63 ± 1.24 Mg C d−1 (flooded). Integrating these values into the total C landscape exchange offset the terrestrial C sink by ∼9–∼13%. When N2O emissions were calculated as CO2 equivalents, these emissions were negligible relative to CO2 and CH4. Our study shows that in the northeast Siberian Arctic tundra, summertime CO2 and CH4 emissions from inland waters are a potentially important component of landscape C exchange with the atmosphere, offsetting the terrestrial sink capacity, and this may be an important consideration for constraining future Arctic responses to climate warming.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Martyn Rosco, Melanie ; Department of Earth Sciences Vrije Universiteit Amsterdam Amsterdam the Netherlands
Dean, Joshua F. ; School of Geographical Sciences University of Bristol Bristol UK
Borges, Alberto ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Chemical Oceanography Unit (COU)
Meisel, Ove H. ; School of Geographical Sciences University of Bristol Bristol UK
van Logtestijn, Richard; Section Systems Ecology Amsterdam Institute for Life and Environment Vrije Universiteit Amsterdam Amsterdam the Netherlands
Hensgens, Geert ; Department of Earth Sciences Vrije Universiteit Amsterdam Amsterdam the Netherlands
Karsanaev, Sergei; Siberian Branch Russian Academy of Sciences Institute for Biological Problems of the Cryolithozone Yakutsk Russia
Maximov, Trofim; Siberian Branch Russian Academy of Sciences Institute for Biological Problems of the Cryolithozone Yakutsk Russia
Weedon, James T.; Section Systems Ecology Amsterdam Institute for Life and Environment Vrije Universiteit Amsterdam Amsterdam the Netherlands
Aerts, Rien; Section Systems Ecology Amsterdam Institute for Life and Environment Vrije Universiteit Amsterdam Amsterdam the Netherlands
Vonk, Jorien E.; Department of Earth Sciences Vrije Universiteit Amsterdam Amsterdam the Netherlands
Dolman, A. Johannes; Department of Earth Sciences Vrije Universiteit Amsterdam Amsterdam the Netherlands ; NIOZ Royal Netherlands Institute for Sea Research Texel The Netherlands
Language :
English
Title :
The Importance of Inland Water CO2, CH4, and N2O for Summertime Greenhouse Gas Exchange With the Atmosphere in Arctic Tundra Lowlands
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