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  • 2020-2024  (18)
  • 2000-2004  (26)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Reduced calcification of marine plankton in response to increased atmospheric CO 2 (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 407 (2000), S. 364-367 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The formation of calcareous skeletons by marine planktonic organisms and their subsequent sinking to depth generates a continuous rain of calcium carbonate to the deep ocean and underlying sediments. This is important in regulating marine carbon cycling and ocean–atmosphere ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35030078
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Temperature effects on the physiology of photosynthesis and respiration in Phaeodactylum tricornutum (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-15
    Description: Phaeodactylum tricornutum strain CCAP 1052/1A was cultivated at 6°C and 15°C under controlled conditions (32 salinity, F/2 medium, 400 µatm pCO2, 100 µmol photons m-2 s-2 light intentsity 16:8 light:dark cycle) in semi-continous batch cultures. We assessed the carbonate chemistry (pH, total alkalinity, dissolved inorganic carbon), growth rates, particulate organic carbon and nitrogen (POC and PON), chlorophyll a quota (Chl a), POC:PON ratios, Chl a:POC ratios as well as production rates at both acclimation temperatures. Additionally, we performed biological invivo assays to measure rates of gross photosynthetic oxygen release, gross photosynthetic carbon uptake, respiratory oxygen uptake and respiratory carbon release using membrane-inlet mass-spectrometry. Assays were performed in photosynthesis-irradiance-(PI-)curves of increasing light intensity (0, 50, 150, 250, 400 µmol photons m-2 s-2). First rates were measured under acclimation temperature (6°C and 15°C), directly afterwards, the assay temperature was abruptly shifted to 15°C or 6°C, respectively, and the PI-curve measurement was repeated, so that 6°C acclimated cells were measured at 15°C and 15°C acclimated cells were measured at 6°C. Q10 factors were calculated from acclimated cells und the respective temperature shift. Photosynthetic and respiratory quotients were calculated for acclimated cells as well as after the abrupt temperature shift. PI-parameters, i.e. maximum photosynthesis rate, light use efficiency and light saturation index were calculated. All experiments were performed in laboratories at the Alfred-Wegener-Institute Bremerhaven.
    Keywords: Alkalinity, total; Calculated; Calculation according to Rehder et al. (2023); Calculation according to Rokitta & Rost (2012); Carbon, inorganic, dissolved; Carbon, organic, particulate, per cell; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Chlorophyll a/particulate organic carbon ratio; Chlorophyll a per cell; Coulter Counter (Beckman Coulter); Date/time end, experiment; Date/time start, experiment; Diatom; Elemental analyzer, EuroVector, EA 3000; Experiment; Factor quantifying temperature dependent change of rates of processes; Generation; Gross photosynthetic carbon uptake rate, per chlorophyll a; Gross photosynthetic oxygen release rate, per chlorophyll a; Growth rate; Laboratory; Laboratory experiment; Laboratory fluorometer, Turner, Trilogy; Light saturation index; Light use efficiency; Maximum photosynthetic carbon uptake rate, per chlorophyll a; Maximum photosynthetic oxygen release rate, per chlorophyll a; Measured with colorimetric assay on QuAAtro continuous segmented flow analyzer (Seal Analytical); Medium; Membrane inlet mass spectrometer (MIMS), GV Instruments, Isoprime; Nitrogen, organic, particulate, per cell; Particulate organic carbon production per cell; pH; Phaeodactylum tricornutum; Photosynthesis; Photosynthetic quotient; Physiological performance; Phytoplankton; Respiration; Respiratory carbon release rate, per chlorophyll a; Respiratory oxygen uptake rate, per chlorophyll a; Respiratory quotient; Salinity; Sample ID; Sampling date/time, experiment; Species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Strain; Temperature; Titration analyzer, Schott Instruments, TitroLine alpha plus; Treatment: light:dark cycle; Treatment: light intensity; Treatment: temperature; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 736 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Phaeocystis pouchetii's responses to temperature (2 vs. 6 °C), light (55 vs. 160 µmol photons m-2 s-1) and pCO2 (400 vs. 1000 µatm) (2022)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Description: We assessed the responses of solitary cells of Arctic Phaeocystis pouchetii (Strain PS78) grown under a matrix of temperature (2°C vs. 6°C), light intensity (55 vs. 160 μmol photons m-2 s-1) and CO2 partial pressures (pCO2; 400 vs. 1000 μatm). Before the experiments, the strain (isolated during Polarstern cruise PS78 in 2011) was kept as stock culture at 1° in 0.2 µm sterile-filtered Arctic seawater (Salinity 33), enriched with vitamins and trace metals according to F/2 medium (Guillard & Ryther, 1962). Nitrate and phosphate were added in concentrations of 100 and 6 µmol L-1, respectively. Experiments were conducted between May 2016 and September 2017 at the Alfred-Wegener-Institute, using standardized media and continuous light exposition. Next to acclimation parameters (growth rates, particulate and dissolved organic carbon and nitrogen, chlorophyll a content), we measured physiological processes in-vivo (electron transport rates and net photosynthesis) using fast-repetition rate fluorometry and membrane-inlet mass spectrometry.
    Keywords: Alkalinity, total; Bottle incubation; calculated from carbonate chemistry using the CO2Sys Excel sheet (Pierrot, Lewis & Wallace, 2006); calculated from chlorophyll a (chl a) and particulate organic carbon (POC) quota; calculated from growth rate and particulate organic carbon (POC) quota; calculated from growth rate and particulate organic nitrogen (PON) quota; calculated from particulate organic carbon (POC) and particulate organic nitrogen (PON) quota; Carbon, inorganic, dissolved; Carbon dioxide, partial pressure; Colorimetric detection, TRAACs continuous flow autoanalyzer, according to the method of Stoll et al. (2001); Coulter counter, Beckman Coulter, Multisizer 3; DATE/TIME; Electron transport rate, relative; Elemental analyzer, EuroVector, EuroEA; EXP; Experiment; Experimental treatment; Fitted parameter using the photosynthesis vs. Irradiance equation from Rokitta & Rost (2012), raw data obtained using a membrane-inlet mass spectrometer (MIMS) as described in Kottmeier, Rokitta & Rost (2016); Fitted parameter using the photosynthesis vs. Irradiance equation from Rokitta & Rost (2012); raw data obtained using a fast-repetition rate fluoremeter (FRRF), FastOcean PTX with FastAct Laboratory system, Chelsea Technologies after Oxborough et al. (201; Fluorometer, Turner Designs, TD-700, using acidification method (Knap et al., 1996); Fram Strait; Identification; Initial slope of the photosynthesis-irradiance curve; Initial slope of the photosynthesis-irradiance curve, relative electron transfer rate per unit light; Light; Light acclimation index; Maximum photosynthesis rate, oxygen, per chlorophyll a; model simulation; pCO2; pCO2 mixed from CO2-free air and pure CO2 with a custom built gas mixing system; pH; pH 826 mobile handheld device, with Aquatrode Plus, Metrohm; Phaeocystis_pouchetii_PS78; Phaeocystis pouchetii; Phaeocystis pouchetii, carbon, organic, particulate/nitrogen, organic, particulate ratio; Phaeocystis pouchetii, chlorophyll a/carbon, organic, particulate ratio; Phaeocystis pouchetii, chlorophyll a quota per cell; Phaeocystis pouchetii, growth rate; Phaeocystis pouchetii, particulate organic carbon production per cell; Phaeocystis pouchetii, particulate organic carbon quota per cell; Phaeocystis pouchetii, particulate organic nitrogen production per cell; Phaeocystis pouchetii, particulate organic nitrogen quota per cell; Phytoplankton; RCP8.5; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Strain; Temperature; Temperature, water; Thermometer, internal, Aquatrode Plus, Metrohm; Treatment: light intensity; Treatment: partial pressure of carbon dioxide; Treatment: temperature; Type of study; Universal light meter & data logger, WALZ, ULM-500, with 4Pi sensor, LI-COR
    Type: Dataset
    Format: text/tab-separated-values, 908 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Depth integrated biogeochemical and ecophysiological monitoring at station KB3 in Kongsfjorden (2016-2018), Version 2 (2022)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Description: The project AWI-funded AMUST project aims at understanding at current and future controls of Arctic spring blooms and concurrrent effetcs on biogeochemistry,by combining experimental work with long-term monitoring in April and May each year to study the Kongsfjorden spring bloom. This dataset was also used in the FAABulous project to compare spring bloom phenology in open-water and ice-covered fjords. Environmental as well as biological (stoichiometry and photosynthesis) data from the years 2014, and 2016-2018 for the mid-fjord station KB3 were samples. Furthermore, daily average temperature and salinity from a nearby mooring (see Hop et al. 2019 for details) are provided for the study period.
    Keywords: Active mixing layer depth; AMUST; Arctic; Arctic phytoplankton under MUltiple STressors; AWIPEV; AWIPEV_2016-AMUST; AWIPEV_2016-AMUST_KB3; AWIPEV_2017-AMUST; AWIPEV_2017-AMUST_KB3; AWIPEV_2018-AMUST; AWIPEV_2018-AMUST_KB3; Calculated from discrete Chl-specific light limited slopes of PI curves; Calculated from discrete spherical 4pi sensor profiles; Campaign; Chlorophyll a; Chlorophyll a, integrated; DATE/TIME; Depth with 1% of photosynthetic active radiation; Dimethylsulfoniopropionate, integrated; Event label; FAABulous; FAABulous: Future Arctic Algae Blooms and their role in the context of climate change; inorganic nutrients; Kongsfjorden; KOP151; Light attenuation, vertical; Light-depended increase in 14C uptake; MON; Monitoring; Net primary production of carbon, integrated; Nitrate, integrated; Phytoplankton; primary production; Station label; Water samples
    Type: Dataset
    Format: text/tab-separated-values, 326 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Seawater carbonate chemistry and Phaeocystis pouchetii's responses to temperature (2 vs. 6 °C), light (55 vs. 160 µmol photons m-2 s-1) and pCO2 (400 vs. 1000 µatm) (2024)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: We assessed the responses of solitary cells of Arctic Phaeocystis pouchetii (Strain PS78) grown under a matrix of temperature (2°C vs. 6°C), light intensity (55 vs. 160 μmol photons m-2 s-1) and CO2 partial pressures (pCO2; 400 vs. 1000 μatm). Before the experiments, the strain (isolated during Polarstern cruise PS78 in 2011) was kept as stock culture at 1° in 0.2 µm sterile-filtered Arctic seawater (Salinity 33), enriched with vitamins and trace metals according to F/2 medium (Guillard & Ryther, 1962). Nitrate and phosphate were added in concentrations of 100 and 6 µmol L-1, respectively. Experiments were conducted between May 2016 and September 2017 at the Alfred-Wegener-Institute, using standardized media and continuous light exposition. Next to acclimation parameters (growth rates, particulate and dissolved organic carbon and nitrogen, chlorophyll a content), we measured physiological processes in-vivo (electron transport rates and net photosynthesis) using fast-repetition rate fluorometry and membrane-inlet mass spectrometry. In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2022) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2024-01-20.
    Keywords: Alkalinity, total; Aragonite saturation state; Arctic; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottle incubation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; calculated from carbonate chemistry using the CO2Sys Excel sheet (Pierrot, Lewis & Wallace, 2006); calculated from chlorophyll a (chl a) and particulate organic carbon (POC) quota; calculated from growth rate and particulate organic carbon (POC) quota; calculated from growth rate and particulate organic nitrogen (PON) quota; calculated from particulate organic carbon (POC) and particulate organic nitrogen (PON) quota; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, particulate, per cell; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a/particulate organic carbon ratio; Chlorophyll a per cell; Chromista; Colorimetric detection, TRAACs continuous flow autoanalyzer, according to the method of Stoll et al. (2001); Coulter counter, Beckman Coulter, Multisizer 3; Date/time end; Date/time start; Electron transport rate, relative; Elemental analyzer, EuroVector, EuroEA; EXP; Experiment; Experimental treatment; Fitted parameter using the photosynthesis vs. Irradiance equation from Rokitta & Rost (2012), raw data obtained using a membrane-inlet mass spectrometer (MIMS) as described in Kottmeier, Rokitta & Rost (2016); Fitted parameter using the photosynthesis vs. Irradiance equation from Rokitta & Rost (2012); raw data obtained using a fast-repetition rate fluoremeter (FRRF), FastOcean PTX with FastAct Laboratory system, Chelsea Technologies after Oxborough et al. (201; Fluorometer, Turner Designs, TD-700, using acidification method (Knap et al., 1996); Fram Strait; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth rate; Haptophyta; Initial slope of the photosynthesis-irradiance curve, relative electron transfer rate per unit light; Laboratory experiment; Light; Light acclimation index; Maximum photosynthesis rate, oxygen, per chlorophyll a; Nitrogen, organic, particulate, per cell; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon production per cell; pCO2 mixed from CO2-free air and pure CO2 with a custom built gas mixing system; Pelagos; pH; pH 826 mobile handheld device, with Aquatrode Plus, Metrohm; Phaeocystis_pouchetii_PS78; Phaeocystis pouchetii; Phytoplankton; Polar; Primary production/Photosynthesis; Production of particulate organic nitrogen; Replicate; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Strain; Temperature; Temperature, water; Thermometer, internal, Aquatrode Plus, Metrohm; Treatment: light intensity; Treatment: partial pressure of carbon dioxide; Treatment: temperature; Type of study; Universal light meter & data logger, WALZ, ULM-500, with 4Pi sensor, LI-COR
    Type: Dataset
    Format: text/tab-separated-values, 1580 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Depth integrated biogeochemical and ecophysiological monitoring at station KB3 in Kongsfjorden (2016-2018) (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Description: The project AWI-funded AMUST project aims at understanding at current and future controls of Arctic spring blooms and concurrrent effetcs on biogeochemistry,by combining experimental work with long-term monitoring in April and May each year to study the Kongsfjorden spring bloom. This dataset was also used in the FAABulous project to compare spring bloom phenology in open-water and ice-covered fjords. Environmental as well as biological (stoichiometry and photosynthesis) data from the years 2014, and 2016-2018 for the mid-fjord station KB3 were samples. Furthermore, daily average temperature and salinity from a nearby mooring (see Hop et al. 2019 for details) are provided for the study period.
    Keywords: AMUST; Arctic; Arctic phytoplankton under MUltiple STressors; AWIPEV; AWIPEV_2016-AMUST; AWIPEV_2016-AMUST_KB3; AWIPEV_2017-AMUST; AWIPEV_2017-AMUST_KB3; AWIPEV_2018-AMUST; AWIPEV_2018-AMUST_KB3; Calculated from discrete Chl-specific light limited slopes of PI curves; Calculated from discrete spherical 4pi sensor profiles; Campaign; Chlorophyll a; Chlorophyll a, integrated; DATE/TIME; Depth with 1% of photosynthetic active radiation; Dimethylsulfoniopropionate, integrated; FAABulous; FAABulous: Future Arctic Algae Blooms and their role in the context of climate change; inorganic nutrients; Kongsfjorden; KOP151; Light attenuation, vertical; Light-depended increase in 14C uptake; Mixed layer depth; MON; Monitoring; Net primary production of carbon, integrated; Nitrate, integrated; Phytoplankton; primary production; Station label; Water samples
    Type: Dataset
    Format: text/tab-separated-values, 339 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Seawater carbonate chemistry and growth rates, carbon utilization and the internal pH regulation at the site of calcification in Emiliania huxleyi, Calcidiscus leptoporus and Pleurochrysis (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Ocean acidification (OA) appears to have diverse impacts on calcareous coccolithophores, but the cellular processes underlying these responses are not well understood. Here we use stable boron and carbon isotopes, B/Ca ratios, as well as inorganic and organic carbon production rates to investigate the carbon utilization and the internal pH regulation at the site of calcification in Emiliania huxleyi, Pleurochrysis carterae and Calcidiscus leptoporus cultured over a wide pCO2 range (180 to 1000 μatm). Despite large variability, the geochemistry data indicate species-specific modes of pH control and differences in the utilization of inorganic carbon. Boron isotope data suggest that all three species generally upregulate the pH of the calcification fluid (pHCF) compared to surrounding seawater, which coincides with relatively constant growth rates and cellular ratios of inorganic to organic carbon. Furthermore, species exhibit different strategies in regulating their pHCF, i.e., two species maintain homeostasis (pHCF = ∼ 8.7), while one species shows a constant offset to the surrounding seawater (ΔpH = ∼0.6 units) over the entire tested pCO2 range. In addition to these different strategies, carbon isotope data suggests that high plasticity in the utilization of dissolved inorganic carbon might be an explanation for species-specific differences in coccolithophore responses to OA.
    Keywords: Acid-base regulation; Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Boron/Calcium ratio; Boron/Calcium ratio, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcidiscus leptoporus; Calcification/Dissolution; Calcifying fluid, pH; Calcifying fluid, pH, standard deviation; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, inorganic, particulate, per cell; Carbon, organic, particulate, per cell; Carbon, organic, particulate, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Difference δ13C, particulate inorganic carbon and dissolved inorganic carbon; Difference δ13C, particulate inorganic carbon and dissolved inorganic carbon, standard deviation; Difference δ13C, particulate organic carbon and dissolved inorganic carbon; Difference δ13C, particulate organic carbon and dissolved inorganic carbon, standard deviation; Emiliania huxleyi; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Haptophyta; Identification; Iron/Calcium ratio; Iron/Calcium ratio, standard deviation; Laboratory experiment; Laboratory strains; Magnesium/Calcium ratio; Magnesium/Calcium ratio, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Other studied parameter or process; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Particulate inorganic carbon/particulate organic carbon ratio, standard deviation; Particulate inorganic carbon per cell, standard deviation; Particulate inorganic carbon production per cell; Particulate organic carbon production per cell; Pelagos; pH; pH, difference; pH, difference, standard deviation; pH, standard deviation; Phytoplankton; Pleurochrysis carterae; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Registration number of species; Salinity; Single species; Species; Temperature, water; Temperature, water, standard deviation; Type; Uniform resource locator/link to reference; δ11B; δ11B, standard deviation; δ13C, dissolved inorganic carbon; δ13C, dissolved inorganic carbon, standard deviation; δ13C, particulate inorganic carbon; δ13C, particulate inorganic carbon, standard deviation; δ13C, particulate organic carbon; δ13C, particulate organic carbon, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1945 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Dissolved inorganic carbon and total alkalinity of seawater samples during RV POLARSTERN expedition PS122 – MOSAiC (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-01
    Description: Discrete seawater samples for dissolved inorganic carbon (DIC) and total alkalinity (TA) were collected from the Polarstern (https://sensor.awi.de/?site=search&q=vessel:polarstern:ctd_sbe9plus_321) and Ocean City (https://sensor.awi.de/?site=search&q=vessel:polarstern:ctd_sbe9plus_935) CTD/Rosette systems during the Multidisciplinary drifting observatory for the study of Arctic Climate (MOSAiC) expedition, 20 September 2019 – 14 October 2020. Following Dickson et al. (2007), seawater samples were collected between 30 October 2019 and 28 September 2020 in borosilicate (3.3) bottles (250 ml), fixed with saturated mercuric chloride (HgCl₂) solution (100 µl), capped with greased (Apiezon® L) ground glass stoppers secured by insulating tape, and stored dark +4°C until post-cruise analysis at the Institute of Marine Research (IMR, Norway), University of East Anglia (UEA, UK), and Hokkaido University (Japan). DIC was determined by coulometric titration (Johnson et al., 1985) using a Versatile INstrument for the Determination of Total inorganic carbon and titration Alkalinity (VINDTA 3C, Marianda, Germany) at UEA, a VINDTA 3D at IMR, and a custom-built extraction system at Hokkaido University (Ono et al., 1998). TA was determined by potentiometric titration using a VINDTA 3C at UEA, a Versatile Instrument for the Determination of Titration Alkalinity (VINDTA 3S, Marianda, Germany) at IMR, and a TA analyzer ATT-05 (Kimoto Electric Co., Ltd., Japan) at Hokkaido University. The accuracy for both DIC and TA was set at IMR and UEA by routine analysis of certified reference material (CRM batch #182, #191) distributed by A. G. Dickson (Scripps Institution of Oceanography, La Jolla, CA, USA). Reference materials (Batch AR and AU; KANSO Technos Co., Ltd., Osaka, Japan), traceable to the Scripps CO₂ CRM, were used at Hokkaido University. Analytical precision for DIC and TA content is 〈 ±2 μmol/kg and 〈 ±2 μmol/kg, respectively, based on CRM replicates. Based on secondary quality control (Jutterström et al., 2010; Tanhua et al., 2010), DIC and TA were adjusted by -8 µmol/kg and -23 µmol/kg, respectively, for events PS122/1_7-49, PS122/1_8-46, PS122/1_9-50, and PS122/1_10-45. Data quality is indicated by flags following the consolidated WOCE system of Jiang et al. (2022).
    Keywords: Alkalinity, total; Arctic Ocean; Bottle number; Carbon, inorganic, dissolved; Carbonate chemistry; Coulometric titration according to Johnson et al. 1985; measured with total inorganic carbon and titration alkalinity analyzer, Marianda, VINDTA; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Dissolved inorganic carbon; ELEVATION; Event label; HAVOC; LATITUDE; LONGITUDE; Mosaic; MOSAiC; MOSAiC_ECO; MOSAiC20192020; Multidisciplinary drifting Observatory for the Study of Arctic Climate; Polarstern; Pressure, water; PS122/1; PS122/1_10-44; PS122/1_5-40; PS122/1_6-58; PS122/1_7-49; PS122/1_8-46; PS122/1_9-50; PS122/2; PS122/2_17-41; PS122/2_18-34; PS122/2_19-56; PS122/2_20-46; PS122/2_21-65; PS122/2_22-47; PS122/2_23-63; PS122/2_25-54; PS122/3; PS122/3_30-41; PS122/3_30-53; PS122/3_31-59; PS122/3_32-75; PS122/3_33-69; PS122/3_34-67; PS122/3_34-77; PS122/3_35-63; PS122/3_35-77; PS122/3_36-59; PS122/3_36-81; PS122/3_37-45; PS122/3_37-88; PS122/3_38-54; PS122/3_38-69; PS122/3_39-51; PS122/3_40-36; PS122/4; PS122/4_44-184; PS122/4_44-67; PS122/4_45-100; PS122/4_45-3; PS122/4_45-31; PS122/4_45-75; PS122/4_45-79; PS122/4_45-82; PS122/4_45-85; PS122/4_45-96; PS122/4_46-60; PS122/4_47-108; PS122/4_47-60; PS122/4_48-15; PS122/4_48-62; PS122/4_49-14; PS122/4_49-25; PS122/5; PS122/5_59-149; PS122/5_59-274; PS122/5_59-306; PS122/5_59-357; PS122/5_59-363; PS122/5_59-62; PS122/5_59-72; PS122/5_60-69; PS122/5_60-89; PS122/5_61-161; PS122/5_61-189; PS122/5_61-211; PS122/5_62-38; PS122/5_62-66; PS122/5_62-91; PS122/5_63-111; PS122/5_63-35; PS122/5_63-53; Quality flag, alkalinity, total; Quality flag, carbon, organic, dissolved; Quality flag, salinity; Quality flag, water temperature; Ridges - Safe HAVens for ice-associated Flora and Fauna in a Seasonally ice-covered Arctic OCean; Salinity; Temperature, water; Total alkalinity; Uniform resource locator/link to sensor metadata; World Oceans Circulation Experiment (WOCE) quality flags according to Jiang et al. (2022)
    Type: Dataset
    Format: text/tab-separated-values, 8580 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Biogeochemical and ecophysiological monitoring at station KB3 in Kongsfjorden (2014-2018) (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Description: The project AWI-funded AMUST project aims at understanding at current and future controls of Arctic spring blooms and concurrrent effetcs on biogeochemistry,by combining experimental work with long-term monitoring in April and May each year to study the Kongsfjorden spring bloom. This dataset was also used in the FAABulous project to compare spring bloom phenology in open-water and ice-covered fjords. Environmental as well as biological (stoichiometry and photosynthesis) data from the years 2014, and 2016-2018 for the mid-fjord station KB3 were samples. Furthermore, daily average temperature and salinity from a nearby mooring (see Hop et al. 2019 for details) are provided for the study period.
    Keywords: Alkalinity, total; AMUST; Arctic; Arctic phytoplankton under MUltiple STressors; AWIPEV; AWIPEV_2014-AMUST; AWIPEV_2014-AMUST_KB3; AWIPEV_2016-AMUST; AWIPEV_2016-AMUST_KB3; AWIPEV_2017-AMUST; AWIPEV_2017-AMUST_KB3; AWIPEV_2018-AMUST; AWIPEV_2018-AMUST_KB3; Campaign; Carbon, inorganic, total; Carbon, organic, particulate; Carbon, organic, particulate/chlorophyll a ratio; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carbon dioxide, partial pressure; Carbon fixation rate; Carbon fixation rate, per chlorophyll a; Chlorophyll a; Connectivity between photosystem II; DATE/TIME; DEPTH, water; Dimethylsulfoniopropionate; Effective absorbance cross-section of photosystem II; FAABulous; FAABulous: Future Arctic Algae Blooms and their role in the context of climate change; Fast repetition rate fluorometry (FRRF) (Kolber & Falkowski, 1993); inorganic nutrients; Kongsfjorden; KOP151; Light saturation point; Maximal absolute electron transfer rate; MON; Monitoring; Nitrate; Nitrogen, organic, particulate; Non photochemical quenching; pH; Phosphate; Photosystem II re-opening rate; Phytoplankton; primary production; Quantum yield efficiency of photosystem II; Salinity; Silicate; Slope; Station label; Temperature, water; Water samples
    Type: Dataset
    Format: text/tab-separated-values, 2454 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Seawater carbonate chemistry and growth, elemental composition,biomass production, respiration and carbon acquisition of diatoms Thalassiosira hyalina and Melosira arctica (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Sea ice retreat, changing stratification, and ocean acidification are fundamentally changing the light availability and physico-chemical conditions for primary producers in the Arctic Ocean. However, detailed studies on ecophysiological strategies and performance of key species in the pelagic and ice-associated habitat remain scarce. Therefore, we investigated the acclimated responses of the diatoms Thalassiosira hyalina and Melosira arctica toward elevated irradiance and CO2 partial pressures (pCO2). Next to growth, elemental composition, and biomass production, we assessed detailed photophysiological responses through fluorometry and gas-flux measurements, including respiration and carbon acquisition. In the pelagic T. hyalina, growth rates remained high in all treatments and biomass production increased strongly with light. Even under low irradiances cells maintained a high-light acclimated state, allowing them to opportunistically utilize high irradiances by means of a highly plastic photosynthetic machinery and carbon uptake. The ice-associated M. arctica proved to be less plastic and more specialized on low-light. Its acclimation to high irradiances was characterized by minimizing photon harvest and photosynthetic efficiency, which led to lowered growth. Comparably low growth rates and strong silification advocate a strategy of persistence rather than of fast proliferation, which is also in line with the observed formation of resting stages under low-light conditions. In both species, responses to elevated pCO2 were comparably minor. Although both diatom species persisted under the applied conditions, their competitive abilities and strategies differ strongly. With the anticipated extension of Arctic pelagic habitats, flexible high-light specialists like T. hyalina seem to face a brighter future.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Antenna size; Aragonite saturation state; Arctic; Bicarbonate ion; Biogenic silica, per cell; Biogenic silica/Carbon, organic, particulate; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, organic, particulate, per cell; Carbon/Nitrogen ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Central_Arctic_ocean; Chlorophyll a/particulate organic carbon ratio; Chlorophyll a per cell; Chromista; Connectivity between photosystem II; Electron transport rate, relative; Electron transport rate, relative, maximum velocity; Event label; EXP; Experiment; Fluorometry; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gas-flux measurement; Growth/Morphology; Growth rate; Identification; Irradiance; KongsfjordenOA; Laboratory experiment; Light; Light saturation point; Maximum light use efficiency; Maximum photochemical quantum yield of photosystem II; Melosira arctica; Net photosynthesis rate, carbon dioxide, per chlorophyll a; Net photosynthesis rate, oxygen, per chlorophyll a; Net photosynthesis rate, oxygen, per particulate organic carbon; Non photochemical quenching; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Open ocean; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon production, per chlorophyll a; Particulate organic carbon production, per particulate organic carbon; Particulate organic carbon production per cell; Pelagos; Percentage; pH; pH, standard deviation; Photosynthetic efficiency, carbon production; Photosynthetic quotient; Phytoplankton; Polar; Primary production/Photosynthesis; Ratio; Reopening rate; Respiration; Respiration rate, oxygen, per chlorophyll a; Salinity; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Temperature, water; Temperature, water, standard deviation; Thalassiosira hyalina; Treatment: partial pressure of carbon dioxide; Type
    Type: Dataset
    Format: text/tab-separated-values, 4737 data points
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