Biogeochemical characterization of pennate diatom and Melosira arctica ice algal aggregates in the Central Arctic Ocean collected in summer 2011 and 2012 ...

• Main Authors: Fernández-Méndez, Mar, Wenzhöfer, Frank, Peeken, Ilka, Sørensen, Heidi L, Glud, Ronnie N, Hendricks, Stefan, Nicolaus, Marcel, Katlein, Christian, Nöthig, Eva-Maria, Bakker, Karel, Boetius, Antje
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: Event label; Optional event label; Gear; Date/Time of event; Latitude of event; Longitude of event; Habitat; Melt pond depth; Melt pond coverage on sea ice; Comment; Type; Sample ID; Description; Color description; Algae aggregate, size; Standard deviation; Salinity; Temperature, water; Irradiance; Taxon/taxa; Life stage; Carbon, organic, particulate; Partical organic nitrogen normalized to particulate organic carbon; Carbon/Nitrogen ratio; Chlorophyll a normalized to particulate organic carbon; Carbon/Chlorophyll a ratio; Chlorophyll a/chloroplastic pigment equivalents ratio; Carbon, organic, dissolved normalized to particulate organic carbon; Transparent exopolymer particles normalized to particulate organic carbon; Replicates; Transparent exopolymer particles/Carbon, organic, particulate ratio; Number of measurements; Net primary production of carbon normalized to particulate organic carbon; Method comment; Prokaryotes, abundance as single cells normalized to particulate organic carbon; Bacterial organic carbon normalized to particulate organic carbon; Nitrate; Phosphate; Silicate; Ice station; Normalized to particulate organic carbon; ARK-XXVI/3; ARK-XXVII/3; Polarstern; Assessment of bacterial life and matter cycling in deep-sea surface sediments ABYSS; Biological Oceanography @ AWI AWI_BioOce; Arctic; Arctic Ocean; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.832345; https://doi.pangaea.de/10.1594/PANGAEA.832345

Sea-ice diatoms are known to accumulate in large aggregates in and under the sea ice including melt ponds. In the Arctic, they can contribute substantially to particle export when sinking from the ice. The role and regulation of microbial aggregation in the highly seasonal, nutrient- and light-limited Arctic sea-ice ecosystem is not yet well understood, and may vary in relation to the fate of the Arctic sea-ice cover. To elucidate the mechanism controlling the formation and export of algal aggregates from sea ice, we investigated samples taken in late summer 2011 and 2012, during two cruises to the Eurasian Basin of the Central Arctic Ocean. Dense, spherical aggregates composed mainly of pennate diatoms, and filamentous aggregates formed by Melosira arctica were found in different degradation stages, with carbon to Chlorophyll a ratios ranging from 110 to 66700, and carbon to nitrogen molar ratios of 8-35 and 9-40, respectively. Fresh sub-ice algal aggregate densities ranged between 1 and 17 aggregates/m**2, ... : Supplement to: Fernández-Méndez, Mar; Wenzhöfer, Frank; Peeken, Ilka; Sørensen, Heidi L; Glud, Ronnie N; Boetius, Antje; Vopel, Kay (2014): Composition, Buoyancy Regulation and Fate of Ice Algal Aggregates in the Central Arctic Ocean. PLoS ONE, 9(9), e107452 ...