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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 (2014): Biogeochemical characterization of pennate diatom and Melosira arctica ice algal aggregates in the Central Arctic Ocean collected in summer 2011 and 2012. doi:10.1594/PANGAEA.832345,
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, doi:10.1371/journal.pone.0107452

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Abstract:
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, corresponding to a net primary production of 0.4-40 mg C/m**2/d, contributing 3-80% of total biomass and up to 94% of total production at a local scale. A key factor controlling buoyancy of the aggregates was light intensity, regulating photosynthetic oxygen production and flotation by gas bubbles trapped within the mucous matrix, even at low ambient nutrient concentrations. Our data was used to evaluate the factors regulating the distribution and importance of the Arctic algal aggregates as carbon source for pelagic and benthic communities.
Source data set:
Hendricks, Stefan; Nicolaus, Marcel; Schwegmann, Sandra (2012): Sea ice conditions during POLARSTERN cruise ARK-XXVII/3 (IceArc). Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, doi:10.1594/PANGAEA.803221
Nicolaus, Marcel; Katlein, Christian; Maslanik, James A; Hendricks, Stefan (2012): Sea ice conditions during the POLARSTERN cruise ARK-XXVI/3 (TransArc) in 2011. Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, doi:10.1594/PANGAEA.803312
Project(s):
Assessment of bacterial life and matter cycling in deep-sea surface sediments (ABYSS)
Coverage:
Median Latitude: 84.804680 * Median Longitude: 76.731705 * South-bound Latitude: 81.884667 * West-bound Longitude: 31.109500 * North-bound Latitude: 88.021670 * East-bound Longitude: 131.128670
Date/Time Start: 2011-08-14T20:40:00 * Date/Time End: 2012-09-19T14:20:00
Minimum Elevation: -4621.1 m * Maximum Elevation: -3424.0 m
Event(s):
PS78/203-1 (Ice station #2) * Latitude: 85.971000 * Longitude: 59.348500 * Date/Time: 2011-08-14T20:40:00 * Elevation: -3777.9 m * Location: Arctic Ocean * Campaign: ARK-XXVI/3 (PS78 TransArc) * Basis: Polarstern * Device: Ice station (ICE)
PS78/209-1 (Ice station #3) * Latitude: 86.982500 * Longitude: 59.003330 * Date/Time: 2011-08-17T19:46:00 * Elevation: -4621.1 m * Location: Arctic Ocean * Campaign: ARK-XXVI/3 (PS78 TransArc) * Basis: Polarstern * Device: Ice station (ICE)
PS78/212-1 (Ice station #4) * Latitude: 88.021670 * Longitude: 59.452500 * Date/Time: 2011-08-19T20:55:00 * Elevation: -4259.6 m * Location: Arctic Ocean * Campaign: ARK-XXVI/3 (PS78 TransArc) * Basis: Polarstern * Device: Ice station (ICE)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Optional event labelEvent 2
3GearGear
4Date/Time of eventDate/Time
5Latitude of eventLatitude
6Longitude of eventLongitude
7HabitatHabitatFernández-Méndez, Mar
8Melt pond depthMelt pond depthmHendricks, Stefansource data sets: Hendricks et al., 2012; Nicolaus et al., 2012
9Melt pond coverage on sea iceMelt pond cov%Hendricks, Stefansource data sets: Hendricks et al., 2012; Nicolaus et al., 2012
10CommentCommentFernández-Méndez, Marabout melt pond
11TypeTypeFernández-Méndez, Marof algae aggregates
12Sample IDSample IDFernández-Méndez, Marof algae aggregates
13DescriptionDescriptionFernández-Méndez, Marof algae aggregates floating behavier
14Color descriptionColor descFernández-Méndez, Marof algae aggregates
15Algae aggregate, sizeAlgae agg sizemmFernández-Méndez, Mar
16Standard deviationStd dev±Fernández-Méndez, Marof algae aggregates, size
17SalinitySalFernández-Méndez, Marof water, minimum
18SalinitySalFernández-Méndez, Marof water, maximum
19SalinitySalFernández-Méndez, Marof aggregates
20Temperature, waterTemp°CFernández-Méndez, Mar
21IrradianceEµE/m2/sFernández-Méndez, Mar
22Taxon/taxaTaxaFernández-Méndez, Mardiatoms
23Life stageLife stageFernández-Méndez, Marof diatoms
24Taxon/taxaTaxaFernández-Méndez, Marof observed grazer
25Carbon, organic, particulatePOCmg/lNöthig, Eva-Mariaof homogene algal slurry
26Partical organic nitrogen normalized to particulate organic carbonPON-POCµmol/mgNöthig, Eva-MariaNormalized to particulate organic carbonof homogene algal slurry
27Carbon/Nitrogen ratioC/NFernández-Méndez, Marof homogene algal slurry
28Chlorophyll a normalized to particulate organic carbonChl a-POCµg/mgPeeken, IlkaNormalized to particulate organic carbonof homogene algal slurry
29Carbon/Chlorophyll a ratioC/Chl aPeeken, Ilkaof homogene algal slurry
30Chlorophyll a/chloroplastic pigment equivalents ratioChl a/CPE%Peeken, Ilkaof homogene algal slurry
31Carbon, organic, dissolved normalized to particulate organic carbonDOC-POCµmol/mgFernández-Méndez, MarNormalized to particulate organic carbonof homogene algal slurry
32Transparent exopolymer particles normalized to particulate organic carbonTEP-POCµg/mgFernández-Méndez, MarNormalized to particulate organic carbonof TEP C, of homogene algal slurry
33Standard deviationStd dev±Fernández-Méndez, Marof TEP C, of homogene algal slurry
34ReplicatesRepl#Fernández-Méndez, Marof homogene algal slurry
35Transparent exopolymer particles/particulate organic carbon ratioTEP/POCFernández-Méndez, Marof homogene algal slurry
36Standard deviationStd dev±Fernández-Méndez, Marof TEP/POC, of homogene algal slurry
37Number of measurementsn#Fernández-Méndez, Marof TEP/POC, of homogene algal slurry
38Net primary production of carbon normalized to particulate organic carbonNPP C-POCmg/mg/dayFernández-Méndez, MarNormalized to particulate organic carbonof homogene algal slurry
39Method commentMethodFernández-Méndez, Marof homogene algal slurry
40Prokaryotes, abundance as single cells normalized to particulate organic carbonProk cell ab-POC109#/mgFernández-Méndez, MarNormalized to particulate organic carbonof homogene algal slurry
41Bacterial organic carbon normalized to particulate organic carbonBOC-POC%Fernández-Méndez, MarNormalized to particulate organic carbonof homogene algal slurry
42NitrateNO3µmol/lBakker, Karelin the water surrounding the aggregates
43PhosphatePO4µmol/lBakker, Karelin the water surrounding the aggregates
44SilicateSi(OH)4µmol/lBakker, Karelin the water surrounding the aggregates
Size:
388 data points

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