Abstract
Algal communities and export of organic matter from sea ice were studied in the offshore marginal ice zone (MIZ) of the northern Barents Sea and Nansen Basin of the Arctic Ocean north of Svalbard by means of ice cores and short-term deployed sediment traps. The observations cover a total of ten stations within the drifting pack ice, visited over a period of 3 years during the period of ice melt in May and July. Maximum flux of particulate organic carbon and chlorophyll a from the ice at 1 m depth (1,537 mg C m−2 per day and 20 mg Chl a m−2 per day) exceeded the flux at 30 m by a factor of 2 during spring, a pattern that was reversed later in the season. Although diatoms dominated the ice-associated algal biomass, flagellates at times revealed similarly high biomass and typically dominated the exported algal carbon. Importance of flagellates to the vertical flux increased as melting progressed, whereas diatoms made the highest contribution during the early melting stage. High export of ice-derived organic matter and phytoplankton took place simultaneously in the offshore MIZ, likely as a consequence of ice drift dynamics and the mosaic structure of ice-covered and open water characteristic of this region.
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Acknowledgments
This study was funded by the Norwegian Research Council (CABANERA project 155936/700). Support was also provided by the Roald Amundsen Centre for Arctic Research (University of Tromsø, projects 200306694-41 and 200406518 to TT) and the Russian Foundation of Basic Research (07-05-00294 to TR). We thank the captain and crew of the RV Jan Mayen for assistance during field operations, and EN Hegseth for making participation in the spring 2004-cruise possible. A Sundfjord is thanked for comments on physical oceanography. CJ Mundy, E Bauerfeind, and one anonymous reviewer are kindly acknowledged for comments that helped to improve this paper.
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Tamelander, T., Reigstad, M., Hop, H. et al. Ice algal assemblages and vertical export of organic matter from sea ice in the Barents Sea and Nansen Basin (Arctic Ocean). Polar Biol 32, 1261–1273 (2009). https://doi.org/10.1007/s00300-009-0622-5
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DOI: https://doi.org/10.1007/s00300-009-0622-5