The Influence of Sea Ice Cover and Atlantic Water Advection on Annual Particle Export North of Svalbard

C. Dybwad, C. Lalande, Y. V. Bodur, S. F. Henley, F. Cottier, E. A. Ershova, L. Hobbs, K. S. Last, A. M. Dąbrowska, M. Reigstad

Research output: Contribution to journalArticlepeer-review

Abstract

The Arctic Ocean north of Svalbard has recently experienced large sea ice losses and the increasing prominence of Atlantic water advection. To investigate the impact of these ongoing changes on annual particle export, two moorings with sequential sediment traps were deployed in ice-free and seasonally ice-covered waters on the shelf north (NSv) and east (ESv) of Svalbard, collecting sinking particles nearly continuously from October 2017 to October 2018. Vertical export of particulate organic carbon (POC), total particulate matter (TPM), planktonic protists, chlorophyll a, and zooplankton fecal pellets were measured, and swimmers were quantified and identified. Combined with sensor data from the moorings, these time-series measurements provided a first assessment of the factors influencing particle export in this region of the Arctic Ocean. Higher annual TPM and POC fluxes at the ice-free NSv site were primarily driven by the advection of Atlantic water, higher grazing by large copepods, and a wind-induced mixing event during winter. Higher diatom fluxes were observed during spring in the presence of sea ice at the ESv site. Along with sea ice cover, regional differences in Atlantic water advection and the seasonal presence of grazers played a prominent role in the biological carbon pump along the continental shelf off Svalbard.
Original languageEnglish
Article numbere2022JC018897
JournalJournal of Geophysical Research: Oceans
Early online date4 Oct 2022
DOIs
Publication statusE-pub ahead of print - 4 Oct 2022

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