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  • 2010-2014  (29)
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  • 1
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    Hydrochemistry measured on water bottle samples during SONNE cruise SO120 (2013)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Ammonium; Bacteria; Bacteria, biomass as carbon; Carbon, inorganic, dissolved; Carbon, organic, particulate; Carbon/nitrogen analyser (GF/F filtered); Carbon biomass estimation (unspec.); Chlorophyll a; Chlorophyll a, fluorometric determination (Grasshoff et al., 1983, Chemie GmbH); Conductivity; Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1); Coulometric titration (Knap et al., 1996, IOC Manuals and Guides 29, UNESCO); Counting by flow cytometer; CTD, Neil Brown, Mark III B, NB-4; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Epifluorescence microscopy; Epifluorescence microscopy after acridine orange staining; Eukaryotes; Event label; Fluorescence, chlorophyll; JGOFS; JGOFS-IN-3; Joint Global Ocean Flux Study; Latitude of event; Leucine uptake rate; Longitude of event; Nanoflagellates, heterotrophic; Nitrate; Nitrite; Nitrogen, organic, particulate; Oxidation; then autoanalysis (GF/F filtered); Oxidation (alkaline) with borate buffered potassium persulphate; Oxygen; Oxygen, Winkler (Culberson, 1991, WOCE Report 68/91); Phosphate; Phosphorus, particulate; Pressure, water; Salinity; Seawater analysis after Grasshoff et al., 1983 (Verlag Chemie GmbH Weinheim); Silicate; Silicon, particulate; SO120; SO120_CTD02_002; SO120_CTD03_003; SO120_CTD04_004; SO120_CTD05_005; SO120_CTD06_006; SO120_CTD07_007; SO120_CTD08_008; SO120_CTD09_009; SO120_CTD10_010; SO120_CTD11_011; SO120_CTD12_012; SO120_CTD13_013; SO120_CTD14_014; SO120_CTD15_016; SO120_CTD15_017; SO120_CTD15_019; SO120_CTD16_023; SO120_CTD17_024; SO120_CTD18_027; SO120_CTD18_029; SO120_CTD19_030; SO120_CTD20_033; SO120_CTD20_034; SO120_CTD21_037; SO120_CTD21_038; SO120_CTD22_040; SO120_CTD23_042; SO120_CTD23_043; SO120_CTD24_046; SO120_CTD24_047; SO120_CTD25_050; SO120_CTD25_051; SO120_CTD25_053; SO120_CTD25_054; SO120_CTD28_055; SO120_CTD28_056; SO120_CTD28_057; SO120_CTD31_058; SO120_CTD31_059; SO120_CTD31_060; SO120_CTD34_062; SO120_CTD34_063; SO120_CTD38_066; SO120_CTD39_068; SO120_CTD39_069; SO120_CTD41_071; SO120_CTD41_072; SO120_CTD43_074; SO120_CTD43_075; Sonne; Temperature, water; Thymidine incorporation; Thymidine uptake rate; Tritiated leucine incorporation (Knap et al., 1996, IOC Manuals and Guides 29)
    Type: Dataset
    Format: text/tab-separated-values, 11513 data points
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    DATA PANGAEA
  • 2
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    Hydrochemistry measured on water bottle samples during SONNE cruise SO120. (2013)
    In:  EPIC3
    Details
    Publication Date: 2017-01-31
    Repository Name: EPIC Alfred Wegener Institut
    Type: Miscellaneous , notRev
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    PAPER (OA)
  • 3
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    A novel estimate of ocean oxygen utilisation points to a reduced rate of respiration in the ocean interior (2013)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 10 (11). pp. 7723-7738.
    Details
    Publication Date: 2019-09-23
    Description: The Apparent Oxygen Utilisation (AOU) is a classical measure of the amount of oxygen respired in the ocean's interior. We show that AOU systematically overestimates True Oxygen Utilisation (TOU) in 6 coupled circulation-biogeochemical ocean models. This is due to atmosphere–ocean oxygen disequilibria in the subduction regions, consistent with previous work. We develop a simple, new, observationally-based approach which we call Evaluated Oxygen Utilisation (EOU). In this approach, we take into account the impact of the upper ocean oxygen disequilibria into the interior, considering that transport takes place predominantly along isopycnal surfaces. The EOU approximates the TOU with less than half of the bias of AOU in all 6 models despite large differences in the physical and biological components of the models. Applying the EOU approach to a global observational dataset yields an oxygen consumption rate 25% lower than that derived from AOU-based estimates, for a given ventilation rate.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/bg-10-7723-2013
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Swept under the carpet: organic matter burial decreases global ocean biogeochemical model sensitivity to remineralization length scale (2013)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 10 . pp. 8401-8422.
    Details
    Publication Date: 2019-09-23
    Description: Although of substantial importance for marine tracer distributions and eventually global carbon, oxygen, and nitrogen fluxes, the interaction between sinking and remineralization of organic matter, benthic fluxes and burial is not always represented consistently in global biogeochemical models. We here aim to investigate the relationships between these processes with a suite of global biogeochemical models, each simulated over millennia, and compared against observed distributions of pelagic tracers and benthic and pelagic fluxes. We concentrate on the representation of sediment–water interactions in common numerical models, and investigate their potential impact on simulated global sediment–water fluxes and nutrient and oxygen distributions. We find that model configurations with benthic burial simulate global oxygen well over a wide range of possible sinking flux parameterizations, making the model more robust with regard to uncertainties about the remineralization length scale. On a global scale, burial mostly affects oxygen in the meso- to bathypelagic zone. While all model types show an almost identical fit to observed pelagic particle flux, and the same sensitivity to particle sinking speed, comparison to observational estimates of benthic fluxes reveals a more complex pattern, but definite interpretation is not straightforward because of heterogeneous data distribution and methodology. Still, evaluating model results against observed pelagic and benthic fluxes of organic matter can complement model assessments based on more traditional tracers such as nutrients or oxygen. Based on a combined metric of dissolved tracers and biogeochemical fluxes, we here identify two model descriptions of burial as suitable candidates for further experiments and eventual model refinements.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.5194/bg-10-8401-2013
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Towards an assessment of simple global marine biogeochemical models of different complexity (2010)
    Elsevier
    In:  Progress in Oceanography, 86 (3-4). pp. 337-360.
    Details
    Publication Date: 2019-09-23
    Description: We present a suite of experiments with a hierarchy of biogeochemical models of increasing complexity coupled to an offline global ocean circulation model based on the “transport matrix method”. Biogeochemical model structures range from simple nutrient models to more complex nutrient-phytoplankton–zooplankton-detritus-DOP models. The models’ skill is assessed by various misfit functions with respect to observed phosphate and oxygen distributions. While there is generally good agreement between the different metrics employed, an exception is a cost function based on the relative model-data misfit. We show that alterations in parameters and/or structure of the models – especially those that change particle export or remineralization profile – affect subsurface and mesopelagic phosphate and oxygen, particularly in the upwelling regions. Visual inspection of simulated biogeochemical tracer distributions as well as the evaluation of different cost functions suggest that increasing complexity of untuned, unoptimized models, simulated with parameters commonly used in large-scale model studies does not necessarily improve performance. Instead, variations in individual model parameters may be of equal, if not greater, importance.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.pocean.2010.05.002
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Sensitivity analysis of simple global marine biogeochemical models (2012)
    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 26 . GB2029.
    Details
    Publication Date: 2019-09-23
    Description: This study presents results from 46 sensitivity experiments carried out with three structurally simple (2, 3, and 6 biogeochemical state variables, respectively) models of production, export and remineralization of organic phosphorus, coupled to a global ocean circulation model and integrated for 3000 years each. The models’ skill is assessed via different misfit functions with respect to the observed global distributions of phosphate and oxygen. Across the different models, the global root-mean square misfit with respect to observed phosphate and oxygen distributions is found to be particularly sensitive to changes in the remineralization length scale, and also to changes in simulated primary production. For this metric, changes in the production and decay of dissolved organic phosphorus as well as in zooplankton parameters are of lesser importance. For a misfit function accounting for the misfit of upper-ocean tracers, however, production parameters and organic phosphorus dynamics play a larger role. Regional misfit patterns are investigated as indicators of potential model deficiencies, such as missing iron limitation, or deficiencies in the sinking and remineralization length scales. In particular, the gradient between phosphate concentrations in the northern North Pacific and the northern North Atlantic is controlled predominantly by the biogeochemical model parameters related to particle flux. For the combined 46 sensitivity experiments performed here, the global misfit to observed oxygen and phosphate distributions shows no clear relation to either simulated global primary or export production for either misfit metric employed. However, a relatively tight relationship that is very similar for the different model of different structural complexity is found between the model-data misfit in oxygen and phosphate distributions to simulated meso- and bathypelagic particle flux. Best agreement with the observed tracer distributions is obtained for simulated particle fluxes that agree most closely with sediment trap data for a nominal depth of about 1000 m, or deeper.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2011GB004072
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    A biogeochemical model assessment platform (2014)
    In:  [Poster] In: WGOMD Workshop on High Resolution Ocean Climate Modeling, 07.-09.04.2014, Kiel, Germany .
    Details
    Publication Date: 2014-12-09
    Description: Ocean biogeochemistry has a large effect on marine biogeochemical tracer distribution, comparable to that of circulation. However, the exact form of many biogeochemical processes, and therefore their parameterisation in global models, is not well known. Using the "Transport Matrix Method" (Khatiwala et al., 2005) as an offline tool to quickly equilibrate global coupled ocean biogeochemical models, we carry out sensitivity analyses to assess the skill of different biogeochemical, physical, and numerical setups. The ultimate aim is to find the "best" (with respect to metrics tailored for specific research questions) biogeochemical model, that may eventually be integrated into e.g. high-resolution models,or models that simulate transient scenarios.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Poster
  • 8
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    Cs-137 off Fukushima Dai-ichi, Japan - model based estimates of dilution and fate (2012)
    Copernicus Publications (EGU)
    In:  Ocean Science, 8 (3). pp. 319-332.
    Details
    Publication Date: 2019-09-23
    Description: In the aftermath of an earthquake and tsunami on 11 March 2011 radioactive 137Cs was discharged from a damaged nuclear power plant to the sea off Fukushima Dai-ichi, Japan. Here we explore its dilution and fate with a state-of-the-art global ocean general circulation model, which is eddy-resolving in the region of interest. We find apparent consistency between our simulated circulation, estimates of 137Cs discharged ranging from 0.94 p Bq (Japanese Government, 2011) to 3.5 ± 0.7 p Bq (Tsumune et al., 2012), and measurements by Japanese authorities and the power plant operator. In contrast, our simulations are apparently inconsistent with the high 27 ± 15 p Bq discharge estimate of Bailly du Bois et al. (2012). Expressed in terms of a diffusivity we diagnose, from our simulations, an initial dilution on the shelf of 60 to 100 m2 s−1. The cross-shelf diffusivity is at 500 ± 300 m2 s−1 significantly higher and variable in time as indicated by its uncertainty. Expressed as an effective residence time of surface water on the shelf, the latter estimate transfers to 43 ± 16 days. As regards the fate of 137Cs, our simulations suggest that activities up to 4 mBq l−1 prevail in the Kuroshio-Oyashio Interfrontal Zone one year after the accident. This allows for low but detectable 0.1 to 0.3 m Bq l−1 entering the North Pacific Intermediate Water before the 137Cs signal is flushed away. The latter estimates concern the direct release to the sea only.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/os-8-319-2012
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Sensitivity of biogeochemical models to particle export and recycling (2011)
    In:  [Invited talk] In: 3. GEOTRACES Data-Model Synergy Workshop, 14.-17.11.2011, Barcelona, Spain .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 10
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    Deep-Ocean evaluation of forced models with natural C-14 (2013)
    In:  [Talk] In: CarboChange Annual Project Meeting 2013, 24.-26.04.2013, Norwich, UK .
    Details
    Publication Date: 2013-12-18
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
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