Seasonality of vertical flux and sinking particle characteristics in an ice-free high arctic fjord—Different from subarctic fjords?

Source: http://dx.doi.org/10.1016/j.jmarsys.2015.10.003 A manuscript version of this article is part of Ingrid Wiedmann's doctoral thesis, which is available in Munin at http://hdl.handle.net/10037/8293 The arctic Adventfjorden (78°N, 15°E, Svalbard) used to be seasonally ice-covered but has mo...

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Bibliographic Details
Published in:Journal of Marine Systems
Main Authors: Wiedmann, Ingrid, Reigstad, Marit, Marquardt, Miriam, Vader, Anna, Gabrielsen, Tove M.
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier. Journal of Marine Systems 2015
Subjects:
VDP::Matematikk og Naturvitenskap: 400
VDP::Landbruks- og Fiskerifag: 900
Gel trap
Particulate organic carbon (POC)
Particle size spectra
Aggregate
Detritus
Glacial runoff
Adventfjorden
Arctic
Svalbard
Subarctic
Online Access:https://hdl.handle.net/10037/10645
https://doi.org/10.1016/j.jmarsys.2015.10.003
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Summary:Source: http://dx.doi.org/10.1016/j.jmarsys.2015.10.003 A manuscript version of this article is part of Ingrid Wiedmann's doctoral thesis, which is available in Munin at http://hdl.handle.net/10037/8293 The arctic Adventfjorden (78°N, 15°E, Svalbard) used to be seasonally ice-covered but has mostly been ice-free since 2007. We used this ice-free arctic fjord as a model area to investigate (1) how the vertical fl ux of biomass (chlorophyll a and particulate organic carbon, POC) follows the seasonality of suspended material, (2) how sink- ing particle characteristics change seasonally and affect the vertical fl ux, and (3) if the vertical fl ux in the ice-free arctic fjord with glacial runoff resembles the fl ux in subarctic ice-free fjords. During seven fi eld investigations (December 2011 – September 2012), suspended biomass was determined (5, 15, 25, and 60 m), and short-term sediment traps were deployed (20, 30, 40, and 60 m), partly modi fi ed with gel- fi lled jars to study the size and frequency distribution of sinking particles. During winter, resuspension from the sea fl oor resulted in large, detrital sinking particles. Intense sedimentation of fresh biomass occurred during the spring bloom. The highest POC fl ux was found during autumn (770 – 1530 mg POC m − 2 d − 1 ), associated with sediment-loaded glacial runoff and high pteropod abundances. The vertical biomass fl ux in the ice-free arctic Adventfjorden thus resem- bled that in subarctic fjords during winter and spring, but a higher POC sedimentation was observed during autumn.

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