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Other research product . Collection . 2014

Solar radiation over and under sea ice and photographic quantification of Ice algal aggregates during the POLARSTERN cruise ARK-XXVII/3 (IceArc) in summer 2012, supplement to: Katlein, Christian; Fernández-Méndez, Mar; Wenzhöfer, Frank; Nicolaus, Marcel (2014): Distribution of algal aggregates under summer sea ice in the Central Arctic. Polar Biology, Polar Biology, 38(5), 719-731

Katlein, Christian; Fernández-Méndez, Mar; Wenzhöfer, Frank; Nicolaus, Marcel;
Open Access
English
Published: 01 Jan 2014
Publisher: PANGAEA - Data Publisher for Earth & Environmental Science
Abstract

The ice cover of the Arctic Ocean has been changing dramatically in the last decades and the consequences for the sea-ice associated ecosystem remain difficult to assess. Algal aggregates underneath sea ice have been described sporadically but the frequency and distribution of their occurrence is not well quantified. We used upward looking images obtained by a remotely operated vehicle (ROV) to derive estimates of ice algal aggregate biomass and to investigate their spatial distribution. During the IceArc expedition (ARK-XXVII/3) of RV Polarstern in late summer 2012, different types of algal aggregates were observed floating underneath various ice types in the Central Arctic basins. Our results show that the floe scale distribution of algal aggregates in late summer is very patchy and determined by the topography of the ice underside, with aggregates collecting in dome shaped structures and at the edges of pressure ridges. The buoyancy of the aggregates was also evident from analysis of the aggregate size distribution. Different approaches used to estimate aggregate biomass yield a wide range of results. This highlights that special care must be taken when upscaling observations and comparing results from surveys conducted using different methods or on different spatial scales.

Subjects

Assessment of bacterial life and matter cycling in deep-sea surface sediments (ABYSS)

Funded by
EC| ABYSS
Project
ABYSS
ABYSS - Assessment of bacterial life and matter cycling in deep-sea surface sediments
  • Funder: European Commission (EC)
  • Project Code: 294757
  • Funding stream: FP7 | SP2 | ERC
Related to Research communities
European Marine Science
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