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 [dataset]. PANGAEA, https://doi.org/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, https://doi.org/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:
Bakker, Karel (2014): Nutrients measured on sea-ice core samples during POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.834084
Hendricks, Stefan; Nicolaus, Marcel; Schwegmann, Sandra (2012): Sea ice conditions during POLARSTERN cruise ARK-XXVII/3 (IceArc). Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/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 Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.803312
Project(s):
Funding:
Seventh Framework Programme (FP7), grant/award no. 294757: Assessment of bacterial life and matter cycling in deep-sea surface sediments
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 * Method/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 * Method/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 * Method/Device: Ice station (ICE)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Optional event label | Event 2 | ||||
| 3 | Gear | Gear | ||||
| 4 | Date/Time of event | Date/Time | ||||
| 5 | Latitude of event | Latitude | ||||
| 6 | Longitude of event | Longitude | ||||
| 7 | Habitat | Habitat | Fernández-Méndez, Mar | |||
| 8 | Melt pond depth | Melt pond depth | m | Hendricks, Stefan | source data sets: Hendricks et al., 2012; Nicolaus et al., 2012 | |
| 9 | Melt pond coverage on sea ice | Melt pond cov | % | Hendricks, Stefan | source data sets: Hendricks et al., 2012; Nicolaus et al., 2012 | |
| 10 | Comment | Comment | Fernández-Méndez, Mar | about melt pond | ||
| 11 | Type | Type | Fernández-Méndez, Mar | of algae aggregates | ||
| 12 | Sample ID | Sample ID | Fernández-Méndez, Mar | of algae aggregates | ||
| 13 | Description | Description | Fernández-Méndez, Mar | of algae aggregates floating behavier | ||
| 14 | Color description | Color desc | Fernández-Méndez, Mar | of algae aggregates | ||
| 15 | Algae aggregate, size | Algae agg size | mm | Fernández-Méndez, Mar | ||
| 16 | Standard deviation | Std dev | ± | Fernández-Méndez, Mar | of algae aggregates, size | |
| 17 | Salinity | Sal | Fernández-Méndez, Mar | of water, minimum | ||
| 18 | Salinity | Sal | Fernández-Méndez, Mar | of water, maximum | ||
| 19 | Salinity | Sal | Fernández-Méndez, Mar | of aggregates | ||
| 20 | Temperature, water | Temp | °C | Fernández-Méndez, Mar | ||
| 21 | Irradiance | E | µmol/m2/s | Fernández-Méndez, Mar | ||
| 22 | Taxon/taxa | Taxa | Fernández-Méndez, Mar | diatoms | ||
| 23 | Life stage | Life stage | Fernández-Méndez, Mar | of diatoms | ||
| 24 | Taxon/taxa | Taxa | Fernández-Méndez, Mar | of observed grazer | ||
| 25 | Carbon, organic, particulate | POC | mg/l | Nöthig, Eva-Maria | of homogene algal slurry | |
| 26 | Partical organic nitrogen normalized to particulate organic carbon | PON-POC | µmol/mg | Nöthig, Eva-Maria | Normalized to particulate organic carbon | of homogene algal slurry |
| 27 | Carbon/Nitrogen ratio | C/N | Fernández-Méndez, Mar | of homogene algal slurry | ||
| 28 | Chlorophyll a normalized to particulate organic carbon | Chl a-POC | µg/mg | Peeken, Ilka | Normalized to particulate organic carbon | of homogene algal slurry |
| 29 | Carbon/Chlorophyll a ratio | C/Chl a | Peeken, Ilka | of homogene algal slurry | ||
| 30 | Chlorophyll a/chloroplastic pigment equivalents ratio | Chl a/CPE | % | Peeken, Ilka | of homogene algal slurry | |
| 31 | Carbon, organic, dissolved normalized to particulate organic carbon | DOC-POC | µmol/mg | Fernández-Méndez, Mar | Normalized to particulate organic carbon | of homogene algal slurry |
| 32 | Transparent exopolymer particles normalized to particulate organic carbon | TEP-POC | µg/mg | Fernández-Méndez, Mar | Normalized to particulate organic carbon | of TEP C, of homogene algal slurry |
| 33 | Standard deviation | Std dev | ± | Fernández-Méndez, Mar | of TEP C, of homogene algal slurry | |
| 34 | Replicates | Repl | # | Fernández-Méndez, Mar | of homogene algal slurry | |
| 35 | Transparent exopolymer particles/Carbon, organic, particulate ratio | TEP/POC | Fernández-Méndez, Mar | of homogene algal slurry | ||
| 36 | Standard deviation | Std dev | ± | Fernández-Méndez, Mar | of TEP/POC, of homogene algal slurry | |
| 37 | Number of measurements | n | # | Fernández-Méndez, Mar | of TEP/POC, of homogene algal slurry | |
| 38 | Net primary production of carbon normalized to particulate organic carbon | NPP C-POC | mg/mg/day | Fernández-Méndez, Mar | Normalized to particulate organic carbon | of homogene algal slurry |
| 39 | Method comment | Method comm | Fernández-Méndez, Mar | of homogene algal slurry | ||
| 40 | Prokaryotes, abundance as single cells normalized to particulate organic carbon | Prok cell ab-POC | 109 #/mg | Fernández-Méndez, Mar | Normalized to particulate organic carbon | of homogene algal slurry |
| 41 | Bacterial organic carbon normalized to particulate organic carbon | BOC-POC | % | Fernández-Méndez, Mar | Normalized to particulate organic carbon | of homogene algal slurry |
| 42 | Nitrate | [NO3]- | µmol/l | Bakker, Karel | in the water surrounding the aggregates | |
| 43 | Phosphate | [PO4]3- | µmol/l | Bakker, Karel | in the water surrounding the aggregates | |
| 44 | Silicate | Si(OH)4 | µmol/l | Bakker, Karel | in the water surrounding the aggregates |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
388 data points