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  • 1
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    Particulate Thorium-234 (Th-234), organic carbon (POC) and organic nitrogen (PON) concentrations using in-situ pumps (particles 〉53 µm) during POLARSTERN cruise ANT-XXVIII/3 (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: ANT-XXVIII/3; AWI_MarGeoChem; Carbon, organic, particulate; Carbon, organic, particulate/Thorium-234 ratio; Carbon, organic, particulate/Thorium-234 ratio, standard deviation; Date/Time of event; DEPTH, water; Elevation of event; Event label; In situ pump; ISP; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Nitrogen, organic, particulate; Nitrogen, organic, particulate/Thorium-234 ratio; Nitrogen, organic, particulate/Thorium-234 ratio, standard deviation; Polarstern; PS79; PS79/057-5; PS79/069-4; PS79/081-3; PS79/084-11; PS79/091-10; PS79/139-13; PS79/174-17; South Atlantic Ocean; Thorium-234, particulate; Thorium-234, particulate, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 154 data points
    Location Call Number Expected Availability
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  • 2
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    POC/Th-234 and PON/Th-234 ratios, POC and PON export fluxes measured with sediment traps during POLARSTERN cruise ANT-XXVIII/3 (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: ANT-XXVIII/3; AWI_MarGeoChem; Carbon, organic, particulate, flux; Carbon, organic, particulate/Thorium-234 ratio; Carbon, organic, particulate/Thorium-234 ratio, standard deviation; Date/Time of event; DEPTH, water; Duration; Elevation of event; Event label; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Nitrogen, organic, particulate, flux; Nitrogen, organic, particulate/Thorium-234 ratio; Nitrogen, organic, particulate/Thorium-234 ratio, standard deviation; Polarstern; PS79; PS79/086-4; PS79/087-1; PS79/091-3; PS79/098-1; PS79/100-1; PS79/114-1; PS79/128-12; PS79/136-11; PS79/137-1; PS79/139-1; PS79/140-1; South Atlantic Ocean; Trap, sediment; TRAPS
    Type: Dataset
    Format: text/tab-separated-values, 139 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
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    Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012 (2015)
    PANGAEA
    In:  Supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, https://doi.org/10.1016/j.dsr2.2015.12.007
    Details
    Publication Date: 2023-08-01
    Description: Carbon fixation by phytoplankton plays a key role in the uptake of atmospheric CO2 in the Southern Ocean. Yet, it still remains unclear how efficiently the particulate organic carbon (POC) is exported and transferred from ocean surface waters to depth during phytoplankton blooms. In addition, little is known about the processes that control the flux attenuation within the upper twilight zone. Here, we present results of downward POC and particulate organic nitrogen fluxes during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean in summer 2012. We used thorium-234 (234Th) as a particle tracer in combination with drifting sediment traps (ST). Their simultaneous use evidenced a sustained high export rate of 234Th at 100 m depth in the weeks prior to and during the sampling period. The entire study area, of approximately 8000 km**2, showed similar vertical export fluxes in spite of the heterogeneity in phytoplankton standing stocks and productivity, indicating a decoupling between production and export. The POC fluxes at 100 m were high, averaging 26 ± 15 mmol C/m**2/d, although the strength of the biological pump was generally low. Only 〈20% of the daily primary production reached 100 m, presumably due to an active recycling of carbon and nutrients. Pigment analyses indicated that direct sinking of diatoms likely caused the high POC transfer efficiencies (~60%) observed between 100 and 300 m, although faecal pellets and transport of POC linked to zooplankton vertical migration might have also contributed to downward fluxes.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 4
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    Phytoplankton pigment concentrations in the tropical Indian Ocean in July and August 2014 during RV Sonne cruises SO234 and SO235 (2019)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven | Supplement to: Booge, Dennis; Schlundt, Michael; Bracher, Astrid; Endres, Sonja; Zäncker, Birthe; Marandino, Christa A (2018): Marine isoprene production and consumption in the mixed layer of the surface ocean - a field study over two oceanic regions. Biogeosciences, 15(2), 649-667, https://doi.org/10.5194/bg-15-649-2018
    Details
    Publication Date: 2023-08-29
    Description: We present a data set on the concentration of various phytoplankton pigments using High Pressure Liquid Chromatography (HPLC) during the Jula August 2014 RV Sonne cruises SO234 and SO235 in the tropical Indian Ocean.
    Keywords: 19-Butanoyloxyfucoxanthin; 19-Hexanoyloxyfucoxanthin; Alloxanthin; alpha-Carotene; Antheraxanthin; Arabian Sea; Astaxanthin; beta-Carotene; Chlorophyll a; Chlorophyll b; Chlorophyll c1+c2; Chlorophyll c3; Chlorophyllide a; CT; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Diadinoxanthin; Diatoxanthin; Dinoxanthin; Divinyl chlorophyll a; Divinyl chlorophyll b; Event label; Fucoxanthin; Gear; Gyroxanthin diester; High Performance Liquid Chromatography (HPLC); HPLC analysis; Indian Ocean; LATITUDE; LONGITUDE; Lutein; Mozambique Channel; Neoxanthin; OASIS; Peridinin; Pheophorbide a; Pheophytin a; Pheophytin b; phytoplankton pigment concentrations; Pyropheophorbide a; Pyropheophytin a; SO234/2; SO234/2_18-2; SO234/2_19-1; SO234/2_20-1; SO234/2_21-1; SO234/2_23-1; SO234/2_23-2; SO234/2_23-3; SO234/2_23-4; SO234/2_23-5; SO234/2_23-6; SO234/2_23-7; SO234/2_25-1; SO234/2_26-1; SO234/2-track; SO235; SO235_01-1; SO235_02-1; SO235_02-11; SO235_02-6; SO235_02-9; SO235_04-1; SO235_04-3; SO235_04-5; SO235_04-8; SO235_06-1; SO235_07-1; SO235_08-1; SO235_09-1; SO235_10-2; SO235_11-1; SO235_13-1; SO235_13-3; SO235_13-5; SO235_13-9; SO235_14-2; SO235_15-1; SO235-track; Sonne; SPACES II; Station label; Tropical Indian Ocean; Underway cruise track measurements; Violaxanthin; Zeaxanthin
    Type: Dataset
    Format: text/tab-separated-values, 11648 data points
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  • 5
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    Chlorophyll a, primary production and nutrients during POLARSTERN cruise ANT-XXVIII/2 (2017)
    PANGAEA
    In:  Supplement to: Hoppe, Clara Jule Marie; Klaas, Christine; Ossebaar, Sharyn; Soppa, Mariana A; Cheah, Wee; Laglera, Luis Miguel; Santos-Echeandía, Juan; Rost, Björn; Wolf-Gladrow, Dieter A; Bracher, Astrid; Hoppema, Mario; Strass, Volker H; Trimborn, Scarlett (2017): Controls of primary production in two phytoplankton blooms in the Antarctic Circumpolar Current. Deep Sea Research Part II: Topical Studies in Oceanography, 138, 63-73, https://doi.org/10.1016/j.dsr2.2015.10.005
    Details
    Publication Date: 2023-10-18
    Description: The Antarctic Circumpolar Current has a high potential for primary production and carbon sequestration through the biological pump. In the current study, two large-scale blooms observed in 2012 during a cruise with R.V. Polarstern were investigated with respect to phytoplankton standing stocks, primary productivity and nutrient budgets. While net primary productivity was similar in both blooms, chlorophyll a -specific photosynthesis was more efficient in the bloom closer to the island of South Georgia (39 °W, 50 °S) compared to the open ocean bloom further east (12 °W, 51 °S). We did not find evidence for light being the driver of bloom dynamics as chlorophyll standing stocks up to 165 mg/m² developed despite mixed layers as deep as 90 m. Since the two bloom regions differ in their distance to shelf areas, potential sources of iron vary. Nutrient (nitrate, phosphate, silicate) deficits were similar in both areas despite different bloom ages, but their ratios indicated more pronounced iron limitation at 12 °W compared to 39 °W. While primarily the supply of iron and not the availability of light seemed to control onset and duration of the blooms, higher grazing pressure could have exerted a stronger control toward the declining phase of the blooms.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
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    Phytoplankton composition derived from CHEMTAX along 10°E during POLARSTERN cruise ANT-XXVIII/3, Jan-March 2012 (2016)
    PANGAEA
    In:  Supplement to: Cheah, Wee; Soppa, Mariana A; Wiegmann, Sonja; Ossebaar, Sharyn; Laglera, Luis Miguel; Strass, Volker H; Santos-Echeandía, Juan; Hoppema, Mario; Wolf-Gladrow, Dieter A; Bracher, Astrid (2016): Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. Deep Sea Research Part II: Topical Studies in Oceanography, 12 pp, https://doi.org/10.1016/j.dsr2.2016.05.019
    Details
    Publication Date: 2023-10-18
    Description: Phytoplankton community structure and their physiological response in the vicinity of the Antarctic Polar Front (APF; 44°S to 53°S, centred at 10°E) were investigated as part of the ANT-XXVIII/3 Eddy-Pump cruise conducted in austral summer 2012. Our results show that under iron-limited (〈 0.3 µmol/m**3) conditions, high total chlorophyll-a (TChl-a) concentrations (〉 0.6 mg/m**3) can be observed at stations with deep mixed layer (〉 60 m) across the APF. In contrast, light was excessive at stations with shallower mixed layer and phytoplankton were producing higher amounts of photoprotective pigments, diadinoxanthin (DD) and diatoxanthin (DT), at the expense of TChl-a, resulting in higher ratios of (DD+DT)/ TChl-a. North of the APF, significantly lower silicic acid (Si(OH)4) concentrations (〈 2 mmol/m**3) lead to the domination of nanophytoplankton consisting mostly of haptophytes, which produced higher ratios of (DD+DT)/TChl-a under relatively low irradiance conditions. The Si(OH)4 replete (〉 5 mmol/m**3) region south of the APF, on the contrary, was dominated by microphytoplankton (diatoms and dinoflagellates) with lower ratios of (DD+DT)/TChl-a, despite having been exposed to higher levels of irradiance. The significant correlation between nanophytoplankton and (DD+DT)/TChl-a indicates that differences in taxon-specific response to light are also influencing TChl-a concentration in the APF during summer. Our results reveal that provided mixing is deep and Si(OH)4 is replete, TChl-a concentrations higher than 0.6 mg/m**3 are achievable in the iron-limited APF waters during summer.
    Keywords: ANT-XXVIII/3; CHEMTAX (Lewitus et al., 2005); Chlorophytes; Cryptophytes; CTD/Rosette; CTD-RO; Cyanobacteria; Date/Time of event; DEPTH, water; Diatoms; Dinoflagellates; Elevation of event; Event label; Haptophytes; In situ pump; ISP; Latitude of event; Longitude of event; Polarstern; Prasinophytes; PS79; PS79/057-4; PS79/060-5; PS79/061-1; PS79/062-1; PS79/063-2; PS79/064-1; PS79/065-1; PS79/066-1; PS79/068-1; PS79/069-4; PS79/070-3; PS79/073-2; PS79/074-1; PS79/075-9; PS79/076-2; PS79/077-1; PS79/078-1; PS79/079-1; PS79/080-1; PS79/081-11; PS79/081-5; PS79/082-1; PS79/083-1; PS79/084-9; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 1090 data points
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  • 7
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    Nutrient concentrations during POLARSTERN cruise ANT-XXVIII/2 (2017)
    PANGAEA
    Details
    Publication Date: 2023-10-18
    Keywords: ANT-XXVIII/3; Area/locality; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; Nitrate; Phosphate; Polarstern; PS79; PS79/087-2; PS79/088-1; PS79/092-1; PS79/093-1; PS79/095-3; PS79/096-1; PS79/101-1; PS79/102-1; PS79/103-1; PS79/104-1; PS79/105-1; PS79/106-1; PS79/107-1; PS79/108-1; PS79/109-1; PS79/110-1; PS79/111-1; PS79/112-1; PS79/114-2; PS79/115-1; PS79/116-1; PS79/117-1; PS79/118-1; PS79/119-3; PS79/120-1; PS79/121-1; PS79/122-2; PS79/123-1; PS79/124-1; PS79/125-1; PS79/126-1; PS79/127-2; PS79/128-10; PS79/137-7; PS79/144-2; PS79/145-1; PS79/146-1; PS79/147-1; PS79/148-1; PS79/149-1; PS79/150-1; PS79/151-1; PS79/152-1; PS79/153-1; PS79/154-1; PS79/155-1; PS79/156-1; PS79/157-1; PS79/158-1; PS79/159-1; PS79/160-1; PS79/161-1; PS79/162-2; PS79/163-1; PS79/164-1; Silicate; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 2589 data points
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  • 8
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    Averaged nutrient concentrations during POLARSTERN cruise ANT-XXVIII/2 (2017)
    PANGAEA
    Details
    Publication Date: 2023-10-18
    Keywords: ANT-XXVIII/3; Area/locality; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; Nitrate; Nitrate/Phosphate deficit ratio; Nitrate deficit, integrated; Phosphate; Phosphate deficit, integrated; Polarstern; PS79; PS79/085-3; PS79/086-2; PS79/087-2; PS79/088-1; PS79/092-1; PS79/093-1; PS79/095-3; PS79/096-1; PS79/101-1; PS79/102-1; PS79/103-1; PS79/104-1; PS79/105-1; PS79/106-1; PS79/107-1; PS79/108-1; PS79/109-1; PS79/110-1; PS79/111-1; PS79/112-1; PS79/114-2; PS79/115-1; PS79/116-1; PS79/117-1; PS79/118-1; PS79/119-3; PS79/120-1; PS79/121-1; PS79/122-2; PS79/123-1; PS79/124-1; PS79/125-1; PS79/126-1; PS79/127-2; PS79/128-10; PS79/137-7; PS79/144-2; PS79/145-1; PS79/146-1; PS79/147-1; PS79/148-1; PS79/149-1; PS79/150-1; PS79/151-1; PS79/152-1; PS79/153-1; PS79/154-1; PS79/155-1; PS79/156-1; PS79/157-1; PS79/158-1; PS79/159-1; PS79/160-1; PS79/161-1; PS79/162-2; PS79/163-1; PS79/164-1; PS79/165-5; PS79/166-1; PS79/167-1; PS79/168-1; PS79/169-1; PS79/170-1; PS79/171-1; PS79/172-1; PS79/173-1; Silicate; Silicate/Nitrate deficite ratio; Silicate deficit, integrated; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 580 data points
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  • 9
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    Chlorophyll a and primary production during POLARSTERN cruise ANT-XXVIII/2 (2017)
    PANGAEA
    Details
    Publication Date: 2023-10-18
    Keywords: ANT-XXVIII/3; Area/locality; Chlorophyll a, areal concentration; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; Mixed layer depth; Photosynthetic efficiency normalized to chlorophyll a biomass; Polarstern; Primary production, integrated; PS79; PS79/085-3; PS79/086-2; PS79/091-5; PS79/114-2; PS79/128-10; PS79/136-8; PS79/137-7; PS79/138-2; PS79/139-3; PS79/140-12; PS79/147-1; PS79/149-1; PS79/155-1; PS79/160-1; PS79/165-5; PS79/168-1; PS79/169-1; PS79/170-1; PS79/174-9; PS79/175-1; Radiation, photosynthetically active per day; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 116 data points
    Location Call Number Expected Availability
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  • 10
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    Total (dissolved + particulate) Thorium-234 (Th-234) and Uranium-238 (U-238) specific activities in seawater during POLARSTERN cruise ANT-XXVIII/3 (2015)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Keywords: ANT-XXVIII/3; AWI_MarGeoChem; Bottle number; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Polarstern; PS79; PS79/057-4; PS79/063-2; PS79/069-5; PS79/075-9; PS79/081-5; PS79/084-12; PS79/085-3; PS79/086-2; PS79/087-2; PS79/091-1; PS79/091-5; PS79/093-4; PS79/095-1; PS79/095-3; PS79/102-1; PS79/102-3; PS79/106-1; PS79/106-4; PS79/115-1; PS79/115-4; PS79/119-1; PS79/119-3; PS79/128-14; PS79/129-1; PS79/137-7; PS79/139-3; PS79/139-6; PS79/140-12; PS79/147-1; PS79/152-1; PS79/166-1; PS79/170-1; PS79/173-1; PS79/174-20; South Atlantic Ocean; Thorium-234, total; Thorium-234, total, standard deviation; Thorium-234/Uranium-238 activity ratio; Thorium-234/Uranium-238 activity ratio, standard deviation; Uranium-238; Uranium-238, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2261 data points
    Location Call Number Expected Availability
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