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Article Dans Une Revue Earth System Science Data Année : 2022

Nunataryuk field campaigns: Understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region

Bennet Juhls
Atsushi Matsuoka
  • Fonction : Auteur
Gaëlle Mével
  • Fonction : Auteur
David Obie James Anikina
  • Fonction : Auteur
Sofia Antonova
  • Fonction : Auteur
Thomas Bossé-Demers
  • Fonction : Auteur
Lisa Bröder
Raoul-Marie Couture
Emmanuel Devred
Miles Dillon
  • Fonction : Auteur
Aude Flamand
  • Fonction : Auteur
Frank Fell
Joannie Ferland
  • Fonction : Auteur
Marie-Hélène Forget
  • Fonction : Auteur
Michael Fritz
Thomas Gordon
Caroline Guilmette
  • Fonction : Auteur
Andrea Hilborn
Rachel Hussherr
  • Fonction : Auteur
Charlotte Irish
  • Fonction : Auteur
Fabien Joux
  • Fonction : Auteur
Lauren Kipp
  • Fonction : Auteur
Audrey Laberge-Carignan
  • Fonction : Auteur
Hugues Lantuit
Antonio Mannino
  • Fonction : Auteur
Paul Overduin
Laurent Oziel
Colin Stedmon
Crystal Thomas
  • Fonction : Auteur
Lucas Tisserand
Jean-Éric Tremblay
  • Fonction : Auteur
Jorien Vonk
  • Fonction : Auteur
Dustin Whalen
  • Fonction : Auteur
Marcel Babin
  • Fonction : Auteur

Résumé

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 Delta region of northwestern Canada, coupled with increases in river discharge and coastal erosion, trigger 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, well-established, 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 break-up in summer, as well as 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: 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, DOC), and chromophoric 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, colored dissolved organic matter 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.pangaea.de/10.1594/PANGAEA.937587.
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hal-03955929 , version 1 (11-05-2023)

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Martine Lizotte, Bennet Juhls, Atsushi Matsuoka, Philippe Massicotte, Gaëlle Mével, et al.. Nunataryuk field campaigns: Understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region. Earth System Science Data, 2022, ⟨10.5194/essd-2022-163⟩. ⟨hal-03955929⟩
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