Article (Scientific journals)
Organic Carbon Origin, Benthic Faunal Consumption, and Burial in Sediments of Northern Atlantic and Arctic Fjords (60–81°N)
Włodarska-Kowalczuk, Maria; Mazurkiewicz, Mikołaj; Górska, Barbara et al.
2019In Journal of Geophysical Research. Biogeosciences, 124 (12), p. 3737-3751
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Keywords :
organic matter preservation; organic carbon sequestration; benthic carbon mineralization; sedimentary processes; early diagenesis; marine geochemistry
Abstract :
[en] Fjords have been recently recognized as hot spots of organic carbon (Corg) sequestration in marine sediments. This study aims to identify regional and local drivers of variability of Corg burial in north Atlantic and Arctic fjords. We provide a comparative quantification of Corg, δ13C, photosynthetic pigments content, benthic biomass, consumption, Corg accumulation, and burial rates in sediments in six fjords (60–81°N). Higher sediment Corg content in southern Norway reflected longer phytoplankton growth season and higher productivity. Higher contributions of terrestrial Corg were noted in temperate/southern Norway (dense land vegetation and high precipitation) and Arctic/Svalbard (glacial erosion) than in subarctic/northern Norway locations. Benthic biomass and carbon consumption were best correlated to δ13C and photosynthetic pigments content indicating control by quality rather than quantity of available food. Benthic faunal consumption did not seem to affect the variability in Corg burial. Regional environmental factors (water temperature and latitude) combined with local factors (Corg, grain size, and pigment concentration) explained 94% of Corg burial variability. Based on the present study and literature data on Corg content, origin, and burial rates, the fjords were classified into four categories: temperate, subarctic, Arctic with glaciers, and Arctic without glaciers. The variability in marine productivity, terrestrial inflows, and carbon sequestration in fjords must be considered for global estimates of their role in blue carbon storage and for building scenarios of future changes in the course of climate warming.
Disciplines :
Aquatic sciences & oceanology
Earth sciences & physical geography
Environmental sciences & ecology
Author, co-author :
Włodarska-Kowalczuk, Maria
Mazurkiewicz, Mikołaj
Górska, Barbara
Michel, Loïc  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution
Jankowska, Emilia
Zaborska, Agata
Language :
English
Title :
Organic Carbon Origin, Benthic Faunal Consumption, and Burial in Sediments of Northern Atlantic and Arctic Fjords (60–81°N)
Publication date :
December 2019
Journal title :
Journal of Geophysical Research. Biogeosciences
ISSN :
2169-8953
eISSN :
2169-8961
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
124
Issue :
12
Pages :
3737-3751
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 December 2019

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