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  • 1
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    Trace metal concentration of water samples during METEOR cruise M83/1 (2013)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: Cadmium; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cobalt; Comment; Copper; Date/Time of event; DEPTH, water; Event label; GOFLO; GO-FLO 1; GO-FLO 10; GO-FLO 11; GO-FLO 13; GO-FLO 14; GO-FLO 15; GO-FLO 16; GO-FLO 2; GO-FLO 4; GO-FLO 6; GO-FLO 7; GO-FLO 8; GO-FLO 9; Go-Flo bottles; Iron; LATITUDE; Lead; LONGITUDE; M83/1; M83/1_769; M83/1_771; M83/1_777; M83/1_798; M83/1_801; M83/1_831; M83/1_833; M83/1_861; M83/1_862; M83/1_881; M83/1_884; M83/1_912; M83/1_915; Manganese; Meteor (1986); Nickel; Pressure, water; Sample code/label; SFB754; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 551 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Superoxide decay rates during METEOR cruise M83/1 (2013)
    PANGAEA
    In:  Supplement to: Wuttig, Kathrin; Heller, Maija I; Croot, Peter L (2013): Pathways of Superoxide (O2-)Decay in the Eastern Tropical North Atlantic|. Environmental Science & Technology, 47, 10249-10256, https://doi.org/10.1021/es401658t
    Details
    Publication Date: 2024-02-02
    Description: Superoxide is an important transient reactive oxygen species (ROS) in the ocean formed as an intermediate in the redox transformation of oxygen (O2) into hydrogen peroxide (H2O2) and vice versa. This highly reactive and very short-lived radical anion can be produced both via photochemical and biological processes in the ocean. In this paper we examine the decomposition rate of O2- throughout the water column, using new data collected in the Eastern Tropical North Atlantic (ETNA) Ocean. For this approach we applied a semi factorial experimental design, to identify and quantify the pathways of the major identified sinks in the ocean. In this work we occupied 6 stations, 2 on the West African continental shelf and 4 open ocean stations, including the CVOO time series site adjacent to Cape Verde. Our results indicate that in the surface ocean, impacted by Saharan aerosols and sediment resuspension, the main decay pathways for superoxide is via reactions with Mn(||) and organic matter.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; Copper, intercept of decay rate; Copper, log-decay rate; DEPTH, water; Diethylenetriaminepentaacetic acid, decay rate; Event label; GOFLO; GO-FLO 1; GO-FLO 2; GO-FLO 3; GO-FLO 4; GO-FLO 6; GO-FLO 7; Go-Flo bottles; Iron, intercept of decay rate; Iron, log-decay rate; M83/1; M83/1_769; M83/1_771; M83/1_775; M83/1_777; M83/1_798; M83/1_801; Manganese, intercept of decay rate; Manganese, log-decay rate; Meteor (1986); Sea-water, decay rate; SFB754; Standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 500 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
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    Redox speciation from water samples during METEOR cruise M77/1 (2019)
    PANGAEA
    In:  Supplement to: Croot, Peter L; Heller, Maija I; Wuttig, Kathrin (2019): Redox Processes Impacting the Flux of Iron(II) from Shelf Sediments to the OMZ along the Peruvian Shelf. ACS Earth and Space Chemistry, 3(4), 537-549, https://doi.org/10.1021/acsearthspacechem.8b00203
    Details
    Publication Date: 2024-04-18
    Description: Iron (Fe) is a limiting nutrient in many regions of the open ocean and can also play a key role in controlling primary productivity in Eastern Boundary Upwelling Systems (EBUS). In EBUS regions, where intense oxygen minimum zones (OMZs) contact the continental shelf, significant iron inputs can result from the supply of Fe(II) from reducing sediments. How much of this iron makes it to the photic zone depends on physical processes mixing over different time scales (minutes to decades) and the kinetics of redox and complexation processes impacting the biogeochemical cycling of iron. In this work we examine the controls on Fe(II) release from shelf sediments across the Peruvian OMZ by measuring Fe(II) and hydrogen peroxide (H2O2) in the water column and benthic boundary layer (BBL) and applying a simple 1D mixing model, with either 1 or 2 layers, where the flux of Fe(II) to the water column is treated as analogous to radon, that the decay rate is constant within the mixing layer. Our modeling approach then allows us to compare our estimated decay rate against published oxidation rates for specific oxidants of Fe(II) in OMZ waters and check the validity of our approach. Our data indicate that throughout the OMZ, Fe(II) decay rates may be partially influenced by H2O2, but it is most likely that nitrate-dependent anaerobic Fe(II) oxidizing (NDFO) bacteria are the main oxidizers. In the secondary nitrite maxima (SNM), abiotic NO2– or biotic-mediated processes may also be important. This work highlights the importance and uses of redox species in understanding biogeochemical cycles in the ocean.
    Keywords: Bottle number; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; Flag; Height above sea floor/altitude; Hydrogen peroxide, water; Iodide; Iron II, ferrous iron; LATITUDE; LONGITUDE; M77/1; M77/1_395; M77/1_412; M77/1_423; M77/1_436; M77/1_438; M77/1_463; M77/1_468; M77/1_480; M77/1_498; M77/1_515; M77/1_532; M77/1_546; M77/1_547; M77/1_556; M77/1_569; M77/1_575; M77/1_596; M77/1_599; M77/1_609; M77/1_618; M77/1-CTD/RO15; M77/1-CTD/RO16; M77/1-CTD/RO22; M77/1-CTD/RO23; M77/1-CTD/RO28; M77/1-CTD/RO29; M77/1-CTD/RO33; M77/1-CTD/RO34; M77/1-CTD/RO36; M77/1-CTD/RO37; M77/1-CTD/RO39; M77/1-CTD/RO40; M77/1-CTD/RO41; M77/1-CTD/RO45; M77/1-CTD/RO47; M77/1-CTD/RO49; M77/1-CTD/RO5; M77/1-CTD/RO50; M77/1-CTD/RO7; M77/1-CTD/RO8; Meteor (1986); Oxygen; Pressure, water; Salinity; SFB754; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 3825 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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