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  • 1
    Online Resource
    Online Resource
    Trace metal sources and cycling in tropical oxygen minimum zones (2018)
    Kiel : Universitätsbibliothek Kiel
    Details Availability
    Keywords: Hochschulschrift ; Meerwasser ; Spurenmetall
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (xiii, 195 Seiten) , Illustrationen
    URL: https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-239971
    URL: https://d-nb.info/1242472320/34
    URL: https://macau.uni-kiel.de/receive/diss_mods_00023997
    URN: urn:nbn:de:gbv:8-diss-239971
    DDC: 551.46
    Language: English
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  • 2
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    Iron limitation of microbial phosphorus acquisition from METEOR cruise M116 (2019)
    PANGAEA
    In:  Supplement to: Browning, Thomas J; Achterberg, Eric Pieter; Yong, Jaw-Chuen; Rapp, Insa; Utermann, Caroline; Engel, Anja; Moore, C M (2017): Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic. Nature Communications, 8(1), 15465, https://doi.org/10.1038/ncomms15465
    Details
    Publication Date: 2023-10-28
    Description: Here we demonstrate enhanced natural community APase activity following iron amendment within the low zinc and moderately low iron Western North Atlantic. In contrast we find no evidence for trace metal limitation of APase activity beneath the Saharan dust plume in the Eastern Atlantic. Such intermittent iron limitation of microbial phosphorus acquisition provides an additional facet in the argument for iron controlling the coupling between oceanic nitrogen and phosphorus cycles.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Trace metal data from water samples during SONNE cruise SO243 (2020)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: The file contains dissolved and total dissolvable trace metal concentrations (Fe, Co, Mn, Ni, Cd, Cu, Pb, Zn and V), hydrogen peroxide (H2O2), Fe(II), and iodide and iodate concentrations of surface water samples and station depth profiles. Trace metal concentrations were measured by ICP-MS after preconcentration (Rapp et al. 2017, Anal. Chim. Acta). Fe(II) and H2O2 were analyzed on-board using chemiluminescence flow injection analysis (Hopwood et al. 2017, Sci. Rep.). Iodide concentrations were analyzed by cathodic stripping square wave voltammetry (Luther et al. 1988, Anal. Chem.) and Iodate concentrations were measured spectrophotometrically (Chapman and Liss 1977, Mar. Chem.
    Keywords: ASTRA-OMZ; Bottle number; Cadmium; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cobalt; Copper; CT; DATE/TIME; Date/Time of event; DEPTH, water; Event label; GOFLO; Go-Flo bottles; Hydrogen peroxide, standard deviation; Hydrogen peroxide, water; Iodate; Iodide; Iron; Iron II, ferrous iron; LATITUDE; Lead; LONGITUDE; Manganese; Nickel; Sample code/label; SFB754; SO243; SO243_10-3; SO243_12-2; SO243_13-4; SO243_14-4; SO243_15-4; SO243_16-4; SO243_17-4; SO243_18-6; SO243_2-6; SO243_5-5; SO243_6-5; SO243_7-6; SO243_8-4; SO243-track; Sonne_2; Standard deviation; Station label; Underway cruise track measurements; Vanadium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 7077 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Nutrient co-limitation at the boundary of an oceanic gyre: Incubations during METEOR cruise M121 (2019)
    PANGAEA
    In:  Supplement to: Browning, Thomas J; Achterberg, Eric Pieter; Rapp, Insa; Engel, Anja; Bertrand, E M; Tagliabue, Alessandro; Moore, C Mark (2017): Nutrient co-limitation at the boundary of an oceanic gyre. Nature, 551(7679), 242-246, https://doi.org/10.1038/nature24063
    Details
    Publication Date: 2023-09-27
    Description: Nutrient limitation of oceanic primary production exerts a fundamental control on marine food webs and the flux of carbon into the deep ocean1. The extensive boundaries of the oligotrophic sub-tropical gyres collectively define the most extreme transition in ocean productivity, but little is known about nutrient limitation in these zones1,2,3,4. Here we present the results of full-factorial nutrient amendment experiments conducted at the eastern boundary of the South Atlantic gyre. We find extensive regions in which the addition of nitrogen or iron individually resulted in no significant phytoplankton growth over 48 hours. However, the addition of both nitrogen and iron increased concentrations of chlorophyll a by up to approximately 40-fold, led to diatom proliferation, and reduced community diversity. Once nitrogen–iron co-limitation had been alleviated, the addition of cobalt or cobalt-containing vitamin B12 could further enhance chlorophyll a yields by up to threefold. Our results suggest that nitrogen–iron co-limitation is pervasive in the ocean, with other micronutrients also approaching co-deficiency. Such multi-nutrient limitations potentially increase phytoplankton community diversity.
    Keywords: GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    Activities of total 234Th and dissolved 238U during METEOR cruise M136 from the Peruvian Oxygen Minimum Zone (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-15
    Keywords: 234Th tracer; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD 009; CTD 020; CTD 039; CTD 045; CTD 050; CTD 056; CTD 061; CTD 069; CTD 071; CTD 074; CTD 087; CTD 091; CTD 092; CTD-RO; Date/Time of event; DEPTH, water; eastern tropical South Pacific; Elevation of event; Error, absolute; Event label; Fluorescence, chlorophyll; Latitude of event; Longitude of event; M136; M136_353-1; M136_380-1; M136_402-1; M136_428-1; M136_445-1; M136_458-1; M136_472-1; M136_495-1; M136_508-1; M136_516-1; M136_547-1; M136_559-1; M136_567-1; Meteor (1986); Oxygen; Salinity; SFB754; Temperature, water; Thorium-234, total; Uranium-238; Uranium-238, error; uranium-salinity correlation
    Type: Dataset
    Format: text/tab-separated-values, 948 data points
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    DATA PANGAEA
  • 6
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    Activities of total 234Th and dissolved 238U during cruises M136 and M138 from the Peruvian Oxygen Minimum Zone (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-15
    Description: The eastern boundary region of the southeastern Pacific Ocean hosts one of the world's most dynamic and productive upwelling systems with an associated oxygen minimum zone (OMZ). The variability in downward export fluxes in this region, with strongly varying surface productivity, upwelling intensities and water column oxygen content, is however poorly understood. Thorium-234 (234Th) is a powerful tracer to study the dynamics of export fluxes of carbon and other elements, yet intense advection and diffusion in nearshore environments impact the assessment of depth-integrated 234Th fluxes when not properly evaluated. Here we use VmADCP current velocities, satellite wind speed and in situ microstructure measurements to determine the magnitude of advective and diffusive fluxes over the entire 234Th flux budget at 25 stations from 11°S to 16°S in the Peruvian OMZ. Contrary to findings along the GEOTRACES P16 eastern section, our results showed that weak surface wind speed during our cruises induced low upwelling rates and minimal upwelled 234Th fluxes, whereas vertical diffusive 234Th fluxes were important only at a few shallow shelf stations. Horizontal advective and diffusive 234Th fluxes were negligible because of small alongshore 234Th gradients. Our data indicated a poor correlation between seawater 238U activity and salinity. Assuming a linear relationship between the two would lead to significant underestimations of the total 234Th flux by up to 40% in our study. Proper evaluation of both physical transport and variability in 238U activity is thus crucial in coastal 234Th flux studies. Finally, we showed large temporal variations on 234Th residence times across the Peruvian upwelling zone, and cautioned future carbon export studies to take these temporal variabilities into consideration while evaluating carbon export efficiency.
    Keywords: 234Th tracer; Climate - Biogeochemistry Interactions in the Tropical Ocean; eastern tropical South Pacific; SFB754; uranium-salinity correlation
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 7
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    Trace metal data from water samples during METEOR cruise M107 (2019)
    PANGAEA
    In:  Supplement to: Rapp, Insa; Schlosser, Christian; Menzel Barraqueta, Jan-Lukas; Wenzel, Bernhard; Lüdke, Jan; Scholten, Jan Christoph; Gasser, Beat; Reichert, Patrick; Gledhill, Martha; Dengler, Marcus; Achterberg, Eric Pieter (2019): Controls on redox-sensitive trace metals in the Mauritanian oxygen minimum zone. Biogeosciences, 16(21), 4157-4182, https://doi.org/10.5194/bg-16-4157-2019
    Details
    Publication Date: 2024-02-15
    Description: Soluble (〈0.02µm), total dissolved (〈0.2µm) and total dissolvable (unfiltered) trace metals (Cd, Pb, Fe, Ni, Cu, Zn, Mn and Co) from water samples collected at 10 casts using a trace-metal-clean water sampler. Samples were pre-concentrated using an automated off-line pre-concentration device (SeaFAST, ESI) and subsequently analysed using a high resolution inductively coupled plasma-mass spectrometer (HR-ICP-MS, ELEMENT XR, FisherScientific).
    Keywords: Aluminium; Bottle, multi level trace metal; Bottle number; Cadmium; Cast number; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cobalt; Copper; DATE/TIME; DEPTH, water; Event label; Iodate; Iodide; Iron; LATITUDE; Lead; LONGITUDE; M107; M107_539-1; M107_553-1; M107_562-1; M107_575-1; M107_606-1; M107_619-1; M107_652-1; M107_676-1; M107_690-1; M107_706-1; Manganese; Meteor (1986); MLTM; Nickel; SFB754; South Atlantic Ocean; Standard deviation; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 4648 data points
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    DATA PANGAEA
  • 8
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    Activities of total 234Th and dissolved 238U during METEOR cruise M138 from the Peruvian Oxygen Minimum Zone (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-15
    Keywords: 234Th tracer; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD 002; CTD 003; CTD 012; CTD 017; CTD 028; CTD 040; CTD 053; CTD 054; CTD 065; CTD 073; CTD 077; CTD 086; CTD 094; CTD 101; CTD-RO; Date/Time of event; DEPTH, water; eastern tropical South Pacific; Elevation of event; Error, absolute; Event label; Fluorescence, chlorophyll; Latitude of event; Longitude of event; M138; M138_879-1; M138_879-3; M138_882-10; M138_883-12; M138_888-7; M138_892-14; M138_898-1; M138_898-2; M138_904-16; M138_906-18; M138_907-11; M138_912-3; M138_915-1; M138_919-1; Meteor (1986); Oxygen; Salinity; SFB754; Temperature, water; Thorium-234, total; Uranium-238; Uranium-238, error; uranium-salinity correlation
    Type: Dataset
    Format: text/tab-separated-values, 1006 data points
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    DATA PANGAEA
  • 9
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    SFB754 trace metal concentrations of water samples (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-28
    Description: Trace metal clean sampling equipment was deployed on a sub-set of cruises to facilitate the observation of contamination prone chemical parameters. All trace metal sample collection, handling, and analysis was conducted in accordance with GEOTRACES protocols which have been updated through the SFB754 program (Cutter et al., 2014). For cruises with extensive trace metal work, the deployment of an over-pressured clean container on deck facilitated sampling and collection of trace metal and other contamination-prone samples at sea. For cruises from 2008 to 2013, PTFE-coated 8 l GO-FLO bottles (General Oceanics) were mounted on a Kevlar wire with sample handling and preservation as per Chever et al. (2015). From 2014 onwards, 24 Ocean Test Equipment (OTE) samplers were deployed mounted on a powder coated sampling CTD (Sea-Bird SBE25) rosette using a Kevlar conducting cable with sample handling and preservation as per Rapp et al. (2019).
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: 13 datasets
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    DATA PANGAEA
  • 10
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    Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic (2017)
    Nature Research
    In:  Nature Communications, 8 (15465).
    Details
    Publication Date: 2021-04-23
    Description: In certain regions of the predominantly nitrogen limited ocean, microbes can become co-limited by phosphorus. Within such regions, a proportion of the dissolved organic phosphorus pool can be accessed by microbes employing a variety of alkaline phosphatase (APase) enzymes. In contrast to the PhoA family of APases that utilize zinc as a cofactor, the recent discovery of iron as a cofactor in the more widespread PhoX and PhoD implies the potential for a biochemically dependant interplay between oceanic zinc, iron and phosphorus cycles. Here we demonstrate enhanced natural community APase activity following iron amendment within the low zinc and moderately low iron Western North Atlantic. In contrast we find no evidence for trace metal limitation of APase activity beneath the Saharan dust plume in the Eastern Atlantic. Such intermittent iron limitation of microbial phosphorus acquisition provides an additional facet in the argument for iron controlling the coupling between oceanic nitrogen and phosphorus cycles.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1038/ncomms15465
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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