Nunataryuk field campaigns: understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region
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Published:2023-04-13
Issue:4
Volume:15
Page:1617-1653
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ISSN:1866-3516
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Container-title:Earth System Science Data
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language:en
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Short-container-title:Earth Syst. Sci. Data
Author:
Lizotte Martine, Juhls BennetORCID, Matsuoka Atsushi, Massicotte PhilippeORCID, Mével Gaëlle, Anikina David Obie James, Antonova Sofia, Bécu Guislain, Béguin Marine, Bélanger Simon, Bossé-Demers Thomas, Bröder LisaORCID, Bruyant Flavienne, Chaillou GwénaëlleORCID, Comte Jérôme, Couture Raoul-MarieORCID, Devred EmmanuelORCID, Deslongchamps Gabrièle, Dezutter Thibaud, Dillon Miles, Doxaran David, Flamand Aude, Fell FrankORCID, Ferland Joannie, Forget Marie-Hélène, Fritz MichaelORCID, Gordon Thomas J.ORCID, Guilmette Caroline, Hilborn AndreaORCID, Hussherr Rachel, Irish Charlotte, Joux Fabien, Kipp Lauren, Laberge-Carignan Audrey, Lantuit HuguesORCID, Leymarie Edouard, Mannino Antonio, Maury Juliette, Overduin PaulORCID, Oziel Laurent, Stedmon ColinORCID, Thomas Crystal, Tisserand LucasORCID, Tremblay Jean-Éric, Vonk Jorien, Whalen Dustin, Babin Marcel
Abstract
Abstract. Climate warming and related drivers of soil thermal change in the Arctic are expected to modify the distribution and dynamics of carbon contained in perennially frozen grounds. Thawing of permafrost in the Mackenzie River watershed of northwestern Canada, coupled with increases in river discharge and coastal erosion, triggers the release of terrestrial organic matter (OMt) from the largest Arctic drainage basin in North America into the Arctic Ocean. While this process is ongoing and its rate is accelerating, the fate of the newly mobilized organic matter as it transits from the watershed through the delta and into the marine system remains poorly understood. In the framework of the European Horizon 2020 Nunataryuk programme, and as part of the Work Package 4 (WP4) Coastal Waters theme, four field expeditions were conducted in the Mackenzie Delta region and southern Beaufort Sea from April to September 2019. The temporal sampling design allowed the survey of ambient conditions in the coastal waters under full ice cover prior to the spring freshet, during ice breakup in summer, and anterior to the freeze-up period in fall. To capture the fluvial–marine transition zone, and with distinct challenges related to shallow waters and changing seasonal and meteorological conditions, the field sampling was conducted in close partnership with members of the communities of Aklavik, Inuvik and Tuktoyaktuk, using several platforms, namely helicopters, snowmobiles, and small boats. Water column profiles of physical and optical variables were measured in situ, while surface water, groundwater, and sediment samples were collected and preserved for the determination of the composition and sources of OMt, including particulate and dissolved organic carbon (POC and DOC), and colored dissolved organic matter (CDOM), as well as a suite of physical, chemical, and biological variables. Here we present an overview of the standardized datasets, including hydrographic profiles, remote sensing reflectance, temperature and salinity, particle absorption, nutrients, dissolved organic carbon, particulate organic carbon, particulate organic nitrogen, CDOM absorption, fluorescent dissolved organic matter intensity, suspended particulate matter, total particulate carbon, total particulate nitrogen, stable water isotopes, radon in water, bacterial abundance, and a string of phytoplankton pigments including total chlorophyll. Datasets and related metadata can be found in Juhls et al. (2021) (https://doi.org/10.1594/PANGAEA.937587).
Funder
Horizon 2020 ArcticNet Agence Nationale de la Recherche Goddard Space Flight Center Natural Resources Canada Crown-Indigenous Relations and Northern Affairs Canada
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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