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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen uptake rates in phytoplankton and ice algae in the Barents Sea (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 10 (1991), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Uptake rates of NH4+, NO3− and dissolved organic nitrogen (urea) were measured in phytoplankton and in ice algae in the Barents Sea using a 15N-technique. NO3− was the most important nitrogen source for the ice algae (f-ratio = 0.92). The in situ irradiances in the subsurface chlorophyll maximum and in the ice algal communities were low. The in situ NO3− uptake rate in the ice algal communities was light-limited The in situ NO3− and NH4− uptake rates in the subsurface chlorophyll maximum were at times light-limited. It is hypothesised that NH4+ may accumulate in low light in the bottom of the euphotic zone and inhibit the in situ NO3− uptake rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1991.tb00644.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Micromonas pusilla (Prasinophyceae) as part of pico-and nanoplankton communities of the Barents Sea (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 10 (1991), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Micromonas pusilla (Butcher) Manton & Parke appears to be a prominent member of the Barents Sea picoplankton community as revealed by the serial dilution culture method. Cell numbers frequently exceeded 107 cells 1−1, though they usually varied between 103and 106 cells l−1. A number of other identified and unidentified taxa were recorded and quantified. Distribution relative to the marginal ice zone is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1991.tb00646.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ice algae during EPOS, leg 1: assemblages, biomass, origin and nutrients (1993)
    Springer
    Polar biology 13 (1993), S. 61-65 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ice algae in infiltration assemblages were the dominating primary producers in the northwestern Weddell Sea during the austral spring 1988. Band and sub-ice assemblages were encountered at a few stations only. Maximum ice algal biomass measured was 424 μg Chl. a I−1 compared to less than 0.4, μg Chl. a I−1 in the water column. Biomass and nutrient concentrations in the infiltration layer decreased inward from the edge of ice floes. The composition of algal groups indicated that the concentric distribution was due to migration by mobile taxa. Various procedures for melting of ice-containing samples of algae were tested. Melting in dialysis tubing seemed to have advantages over other methods, especially for cells to be used in physiological experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236584
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen uptake in the Weddell Sea during late winter and spring (1992)
    Springer
    Polar biology 12 (1992), S. 245-251 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Uptake rates of ammonium, nitrate and urea were measured during the EPOS leg 1 cruise to the Weddell Sea in October–November 1988 using the isotope 15N. Nitrate was the most important nitrogen source both for ice algae (f-ratio ≥0.88) and for phytoplankton in the water column (f-ratio ≥0.85). Indications of a gradual decrease in % new production with time were found in the outer marginal ice zone. Nitrogen uptake rates in ice algae from the sub-ice assemblage were light-limited at in situ irradiances. Significant regeneration of ammonium was found in ice algal samples only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238266
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  • 5
    Electronic Resource
    Electronic Resource
    Impact of increased river discharge on the phytoplankton community in the outer Oslofjord, Norway (1997)
    Springer
    Hydrobiologia 363 (1997), S. 169-177 
    Details
    ISSN: 1573-5117
    Keywords: bloom ; flood ; harmful ; toxic ; Skeletonema costatum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An extraordinary flood event occurred in SouthernNorway in May–June 1995. The impact of fresh waterdischarge from the river Glomma on phytoplanktonspecies composition and on primary production duringthe flood was studied. The phytoplankton community wasdominated by species usually found in the fjord, thediatom Skeletonema costatum dominated thecommunity together with cyanobacteria. Potentiallyharmful species (e.g. Chrysochromulinapolylepis) were found in low cell densities. No largeincrease in nutrient concentrations were found.Primary production and uptake rates of nitrate andammonium were very low in low-salinity water near theriver outlet. Nutrients from the river water wereefficiently utilized in the open part of the fjord.The flood trigged a phytoplankton bloom dominated byharmless species commonly observed in the fjordplankton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003188714483
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  • 6
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    Highly productive ice algae mats in Arctic melt ponds: Implications for primary production and carbon turnover (2024)
    PANGAEA
    Details
    Publication Date: 2024-02-13
    Description: As the Arctic warms, the historic functioning of local ecosystems is changing in new and not always anticipated ways. One such change is the appearance and expansion of ice algal mats in the melt ponds of northern Svalbard. An expedition to this remote part of the planet was launched in July 2004 to measure the productivity of this new type of mat. Data were collected using oxygen micro electrodes, PAR sensors, and the visual analysis of samples via microscope. This dataset contains the oxygen profiles from this research. Also included are the surface temperature and salt concentrations for each core.
    Keywords: Arctic Biodiversity & Livelihoods; Arctic Ocean; Barents Sea; carbon turnover; Date; DEPTH, ice/snow; FACE-IT; High performance liquid chromatography, Agilent 1100, Agilent Technologies, Germany; ice algae; Identification; melt ponds; Oxygen; Oxygen, gas; Oxygen microsensor, Clark type (Revsbech, 1989); oxygen production and consumption; Oxygen sensor, SBE 44; Photosynthesis; Salinity; Salt content; Svalbard_Carbonara; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 5017 data points
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  • 7
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    Concentrations of suspended and exported organic matter and nutrients during POLARSTERN cruise PS92 (ARK-XXIX/1 TRANSSIZ) in May and June 2015 north of Svalbard (2020)
    PANGAEA
    In:  The Arctic University of Norway
    Details
    Publication Date: 2024-01-20
    Keywords: Arctic Ocean; ARK-XXIX/1, TRANSSIZ; Calculated; Carbon, organic, particulate; Carbon, organic, particulate, flux; Carbon, organic, particulate, flux/Nitrogen, organic, particulate flux ratio; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Chlorophyll a; Chlorophyll a, flux; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; ELEVATION; Event label; Fecal pellet carbon, flux; ICE; Ice station; LATITUDE; LONGITUDE; Microscopy; Nitrate and Nitrite; Nitrogen, organic, particulate; Nitrogen, organic, particulate, flux per day; nutrients; Other event; Phaeopigments; Phaeopigments, flux; Phosphate; POC; Polarstern; PS92; PS92/019-6; PS92/027-2; PS92/031-2; PS92/032-4; PS92/039-6; PS92/043-4; PS92/046-1; PS92/047-3; Salinity; sediment trap; Silicic acid; Temperature, water; TRANSSIZ; Vertical export
    Type: Dataset
    Format: text/tab-separated-values, 1189 data points
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  • 8
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    CarbonBridge - Concentration of suspended and sinking nutrients and organic material in the waters northwest of Spitsbergen in 2014 (2017)
    PANGAEA
    In:  University of Tromso, Norway
    Details
    Publication Date: 2024-02-16
    Description: As part of the Norwegian research project "CarbonBridge - Bridging marine productivity regimes: How Atlantic advective inflow affects productivity, carbon cycling and export in a melting Arctic Ocean" (NRC #226415, RIS #6637), the concentration of inorganic nutrients and organic material (i.e. chlorophyll a, particulate organic matter), as well as primary and secondary production rates were determined from the upper 1000 m of the water column West and North of Spitsbergen. The flux of sinking organic material was also determined. In total three expeditions were conducted in 2014.
    Keywords: CarbonBridge; CarbonBridge Bridging productivity regimes in the Arctic Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 9
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    CarbonBridge May 2014: Concentration of suspended and sinking nutrients and organic material in the waters northwest of Spitsbergen (2017)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Ammonium; Ammonium uptake rate; Bacterial production; C3; C4; C5; C6; C7; C8; Carbon, organic, particulate; Carbon, organic, particulate, flux; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; CarbonBridge; CarbonBridge_stnr0229; CarbonBridge_stnr0231-1; CarbonBridge_stnr0232; CarbonBridge_stnr0233; CarbonBridge_stnr0234; CarbonBridge_stnr0235; CarbonBridge_stnr0236; CarbonBridge_stnr0237; CarbonBridge_stnr0243; CarbonBridge_stnr0260-1; CarbonBridge_stnr0262; CarbonBridge_stnr0281; CarbonBridge_stnr0298; CarbonBridge_stnr0299; CarbonBridge_stnr0300; CarbonBridge_stnr0301; CarbonBridge_stnr0302; CarbonBridge_stnr0303; CarbonBridge Bridging productivity regimes in the Arctic Ocean; CB201405; Chlorophyll a; Chlorophyll a, flux; Chlorophyll a, total; CTD; CTD/Rosette; CTD-RO; D+; D++; D1; D2; D3; D4; D5; D6; Density, sigma-theta (0); DEPTH, water; Event label; f-Ratio; Helmer Hanssen; Nitrate and Nitrite; Nitrate uptake rate; Nitrogen, organic, particulate; Nitrogen, organic, particulate, flux per day; North Greenland Sea; P1; P2; P3; P4; Particulate organic carbon, flux/particulate organic nitrogen flux ratio; Phaeophytin; Phaeophytin, flux; Phosphate; Primary production of carbon; Salinity; Silicate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 2445 data points
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  • 10
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    CarbonBridge January 2014: Concentration of suspended and sinking nutrients and organic material in the waters northwest of Spitsbergen (2017)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Ammonium; Arctic Ocean; B1; B11; B14; B16; B2; B4; B6; B8; Carbon, organic, particulate; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; CarbonBridge; CarbonBridge_stnr0003; CarbonBridge_stnr0013; CarbonBridge_stnr0014; CarbonBridge_stnr0022; CarbonBridge_stnr0024; CarbonBridge_stnr0025; CarbonBridge_stnr0026; CarbonBridge_stnr0027; CarbonBridge_stnr0030; CarbonBridge_stnr0032; CarbonBridge_stnr0033; CarbonBridge_stnr0035; CarbonBridge_stnr0036; CarbonBridge_stnr0037; CarbonBridge Bridging productivity regimes in the Arctic Ocean; CB201401; Chlorophyll a; Chlorophyll a, total; CTD; CTD/Rosette; CTD-RO; D1; D2; D3; D4; D5; D6; Date/Time of event; Density, sigma-theta (0); DEPTH, water; Elevation of event; Event label; Helmer Hanssen; Latitude of event; Longitude of event; Nitrate and Nitrite; Nitrogen, organic, particulate; North Greenland Sea; Phaeophytin; Phosphate; Salinity; Silicate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1552 data points
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