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  • 1
    Electronic Resource
    Electronic Resource
    A lagrangian mixed layer model of Atlantic 18°C water formation (1986)
    [s.l.] : Nature Publishing Group
    Nature 319 (1986), S. 574-576 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On 29 March 1873 the water temperature measurement for HMS Challenger station no. 28 (2439'N, 6526'W) was repeated because the water appeared to be anomalously warm at 200 fathoms. It was suspected that the thermometers were faulty, but replacements gave the same values5·6. That was the first ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/319574a0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    (Figure 6) In situ measurements of particle sinking velocity at the site SC (GeoB12914-4) by the settling chamber versus equivalent spherical diameter
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 238-3; Center for Marine Environmental Sciences; DEPTH, water; Equivalent spherical diameter, mean; GeoB12914-4; MARUM; PARCA; Particle camera; POS365/2; Poseidon; Sinking velocity; VIDEO; Video camera
    Type: Dataset
    Format: text/tab-separated-values, 107 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Figure 4) Particle abundances at site PC (GeoB11834-3)
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 375; Center for Marine Environmental Sciences; DEPTH, water; Digital camera, NIKON Coolpix; GeoB11834-3; Maria S. Merian; MARUM; MSM04/4b; PARCA; Particle camera; Particle concentration
    Type: Dataset
    Format: text/tab-separated-values, 229 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Particle camera and settling chamber measurements at site PC (GeoB11834-3) and SC (GeoB12914-4) off Cape Blanc/Mauritania
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Description: Particles sinking out of the euphotic zone are important vehicles of carbon export from the surface ocean. Most of the particles produce heavier aggregates by coagulating with each other before they sink. We implemented an aggregation model into the biogeochemical model of Regional Oceanic Modelling System (ROMS) to simulate the distribution of particles in the water column and their downward transport in the Northwest African upwelling region. Accompanying settling chamber, sediment trap and particle camera measurements provide data for model validation. In situ aggregate settling velocities measured by the settling chamber were around 55 m d**-1. Aggregate sizes recorded by the particle camera hardly exceeded 1 mm. The model is based on a continuous size spectrum of aggregates, characterised by the prognostic aggregate mass and aggregate number concentration. Phytoplankton and detritus make up the aggregation pool, which has an averaged, prognostic and size dependent sinking. Model experiments were performed with dense and porous approximations of aggregates with varying maximum aggregate size and stickiness as well as with the inclusion of a disaggregation term. Similar surface productivity in all experiments has been generated in order to find the best combination of parameters that produce measured deep water fluxes. Although the experiments failed to represent surface particle number spectra, in the deep water some of them gave very similar slope and spectrum range as the particle camera observations. Particle fluxes at the mesotrophic sediment trap site off Cape Blanc (CB) have been successfully reproduced by the porous experiment with disaggregation term when particle remineralisation rate was 0.2 d**-1. The aggregation-disaggregation model improves the prediction capability of the original biogeochemical model significantly by giving much better estimates of fluxes for both upper and lower trap. The results also point to the need for more studies to enhance our knowledge on particle decay and its variation and to the role that stickiness play in the distribution of vertical fluxes.
    Keywords: 238-3; 375; Center for Marine Environmental Sciences; GeoB11834-3; GeoB12914-4; Maria S. Merian; MARUM; MSM04/4b; PARCA; Particle camera; POS365/2; Poseidon
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Mixed layer and Ekman current response to solar heating (1985)
    In:  EPIC3in: Y. Toba and H. Mitsuyasu (eds.), The Ocean Surface, D. Reidel Publ. Comp., pp. 487-507
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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    PAPER (OA)
  • 6
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    Modelling aggregate formation and sedimentation of organic and mineral particles (2010)
    In:  EPIC3Journal of Marine Systems, in press, 15 p.
    Details
    Publication Date: 2019-07-17
    Description: A one-dimensional model ADAM is presented that allows the prognostic computation of the interactions between mineral particles (dust) and biologically formed aggregates. The model couples a 7-compartment biogeochemical component (NO3, NH4, phytoplankton aggregates, zooplankton, detritus, carbon, and chlorophyll) and a 4-compartment component for the tracing of mineral particles: single free particles in the water, particles aggregated with phytoplankton, incorporated in zooplankton, and attached to detritus. It resolves both annual and daily cycles of plankton and the fate of dust from eolian import into the ocean via biological activity, aggregation and disaggregation to sedimentation at the sea floor. The model results suggest that particle scavenging is essentially occurring in the mixed layer, where biological activity and shear aggregation regulate the formation of the aggregates. The aggregates interact intensively with the suspended pool of dust particles, and sink through the upper main thermocline with increasing speed. Particle break up and organic matter degradation are important mechanisms for particle cycling in the intermediate and deeper layers. The model predicts an 80% decrease of the annual carbon flux between 100 m and 3000 m depth. The vertical profile of Al-contents in suspended particulates and the annual average vertical flux of particulate organic matter are fairly well reproduced by the model, as well as the seasonal cycles of carbon and dust fluxes in the ocean interior.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 7
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    Impact of particle aggregation on vertical fluxes of organic matter (2009)
    In:  EPIC3Progress in Oceanography, 83, 331-341, 83, pp. 331-341
    Details
    Publication Date: 2019-07-16
    Description: Particles sinking out of the euphotic zone are important vehicles of carbon export from the surface ocean. Most of the particles produce heavier aggregates by coagulating with each other before they sink. We implemented an aggregation model into the biogeochemical model of Regional Oceanic Modelling System (ROMS) to simulate the distribution of particles in the water column and their downward transport in the Northwest African upwelling region. Accompanying settling chamber, sediment trap and particle camera measurements provide data for model validation. In situ aggregate settling velocities measured by the settling chamber were around 55 m d−1. Aggregate sizes recorded by the particle camera hardly exceeded 1 mm. The model is based on a continuous size spectrum of aggregates, characterised by the prognostic aggregate mass and aggregate number concentration. Phytoplankton and detritus make up the aggregation pool, which has an averaged, prognostic and size dependent sinking. Model experiments were performed with dense and porous approximations of aggregates with varying maximum aggregate size and stickiness as well as with the inclusion of a disaggregation term. Similar surface productivity in all experiments has been generated in order to find the best combination of parameters that produce measured deep water fluxes. Although the experiments failed to represent surface particle number spectra, in the deep water some of them gave very similar slope and spectrum range as the particle camera observations. Particle fluxes at the mesotrophic sediment trap site off Cape Blanc (CB) have been successfully reproduced by the porous experiment with disaggregation term when particle remineralisation rate was 0.2 d−1. The aggregationdisaggregation model improves the prediction capability of the original biogeochemical model significantly by giving much better estimates of fluxes for both upper and lower trap. The results also point to the need for more studies to enhance our knowledge on particle decay and its variation and to the role that stickiness play in the distribution of vertical fluxes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 8
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    Impact of particle aggregation on vertical fluxes of organic matter (2009)
    Elsevier
    In:  Progress in Oceanography, 83 (1-4). pp. 331-341.
    Details
    Publication Date: 2015-09-18
    Description: Particles sinking out of the euphotic zone are important vehicles of carbon export from the surface ocean. Most of the particles produce heavier aggregates by coagulating with each other before they sink. We implemented an aggregation model into the biogeochemical model of Regional Oceanic Modelling System (ROMS) to simulate the distribution of particles in the water column and their downward transport in the Northwest African upwelling region. Accompanying settling chamber, sediment trap and particle camera measurements provide data for model validation. In situ aggregate settling velocities measured by the settling chamber were around 55 m d(-1). Aggregate sizes recorded by the particle camera hardly exceeded I mm. The model is based on a continuous size spectrum of aggregates, characterised by the prognostic aggregate mass and aggregate number concentration. Phytoplankton and detritus make up the aggregation pool, which has an averaged, prognostic and size dependent sinking. Model experiments were performed with dense and porous approximations of aggregates with varying maximum aggregate size and stickiness as well as with the inclusion of a disaggregation term. Similar surface productivity in all experiments has been generated in order to find the best combination of parameters that produce measured deep water fluxes. Although the experiments failed to represent surface particle number spectra, in the deep water some of them gave very similar slope and spectrum range as the particle camera observations. Particle fluxes at the mesotrophic sediment trap site off Cape Blanc (CB) have been successfully reproduced by the porous experiment with disaggregation term when particle remineralisation rate was 0.2 d(-1). The aggregation-disaggregation model improves the prediction capability of the original biogeochemical model significantly by giving much better estimates of fluxes for both upper and lower trap. The results also point to the need for more studies to enhance our knowledge on particle decay and its variation and to the role that stickiness play in the distribution of vertical fluxes
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.pocean.2009.07.047
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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