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  • 1
    Online Resource
    Online Resource
    Pigmentbiomarker als Indikatoren pelagischer Prozesse in polaren Regionen (2018)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (253 Seiten = 49 MB) , Illustrationen, Graphen, Karten
    URL: https://oceanrep.geomar.de/44156/
    Language: German
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  • 2
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    Colored dissolved organic matter absorption by waters of central-eastern Arctic Ocean (2018)
    PANGAEA
    In:  Supplement to: Gonçalves-Araujo, Rafael; Rabe, Benjamin; Peeken, Ilka; Bracher, Astrid (2018): High colored dissolved organic matter (CDOM) absorption in surface waters of the central-eastern Arctic Ocean: Implications for biogeochemistry and ocean color algorithms. PLoS ONE, 13(1), e0190838, https://doi.org/10.1371/journal.pone.0190838
    Details
    Publication Date: 2024-07-19
    Description: As consequences of global warming sea-ice shrinking, permafrost thawing and changes in fresh water and terrestrial material export have already been reported in the Arctic environment. These processes impact light penetration and primary production. To reach a better understanding of the current status and to provide accurate forecasts Arctic biogeochemical and physical parameters need to be extensively monitored. In this sense, bio-optical properties are useful to be measured due to the applicability of optical instrumentation to autonomous platforms, including satellites. This study characterizes the non-water absorbers and their coupling to hydrographic conditions in the poorly sampled surface waters of the central and eastern Arctic Ocean. Over the entire sampled area colored dissolved organic matter (CDOM) dominates the light absorption in surface waters. The distribution of CDOM, phytoplankton and non-algal particles absorption reproduces the hydrographic variability in this region of the Arctic Ocean which suggests a subdivision into five major bio-optical provinces: Laptev Sea Shelf, Laptev Sea, Central Arctic/Transpolar Drift, Beaufort Gyre and Eurasian/Nansen Basin. Evaluating ocean color algorithms commonly applied in the Arctic Ocean shows that global and regionally tuned empirical algorithms provide poor chlorophyll-a (Chl-a) estimates. The semi-analytical algorithms Generalized Inherent Optical Property model (GIOP) and Garver-Siegel-Maritorena (GSM), on the other hand, provide robust estimates of Chl-a and absorption of colored matter. Applying GSM with modifications proposed for the western Arctic Ocean produced reliable information on the absorption by colored matter, and specifically by CDOM. These findings highlight that only semi-analytical ocean color algorithms are able to identify with low uncertainty the distribution of the different optical water constituents in these high CDOM absorbing waters. In addition, a clustering of the Arctic Ocean into bio-optical provinces will help to develop and then select province-specific ocean color algorithms.
    Keywords: FRAM; FRontiers in Arctic marine Monitoring
    Type: dataset publication series
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 3
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    Microplastic and environmental data from Arctic sea ice (2018)
    PANGAEA
    In:  Supplement to: Peeken, Ilka; Primpke, Sebastian; Beyer, Birte; Guetermann, Julia; Katlein, Christian; Krumpen, Thomas; Bergmann, Melanie; Hehemann, Laura; Gerdts, Gunnar (2018): Arctic sea ice is an important temporal sink and means of transport for microplastic. Nature Communications, 9(1), https://doi.org/10.1038/s41467-018-03825-5
    Details
    Publication Date: 2024-07-19
    Description: Microplastics (MP) are recognized as a growing environmental hazard and have been identified as far as the remote Polar Regions, with particularly high concentrations of microplastics in sea ice. Little is known regarding the horizontal variability of MP within sea ice and how the underlying water body affects MP composition during sea ice growth. Here we show that sea ice MP has no uniform polymer composition and that, depending on the growth region and drift paths of the sea ice, unique MP patterns can be observed in different sea ice horizons. Thus even in remote regions such as the Arctic Ocean, certain MP indicate the presence of localized sources. Increasing exploitation of Arctic resources will likely lead to a higher MP load in the Arctic sea ice and will enhance the release of MP in the areas of strong seasonal sea ice melt and the outflow gateways.
    Keywords: Acrylonitrile butadiene; Arctic Ocean; ARK-XXIX/1, TRANSSIZ; ARK-XXIX/3; ARK-XXVIII/2; Campaign; Carbon, organic, particulate; Carbon/Nitrogen ratio; Cellulose acetate; Chlorinated polyethylene; Chlorophyll a; Cruise/expedition; Date/Time of event; DEPTH, ice/snow; Ethylene-vinyl acetate; Event label; ICE; Ice station; Ice type; Identification; Latitude of event; Longitude of event; Nitrile rubber; Nitrogen, organic, particulate; North Greenland Sea; Particle concentration; Particle concentration, error; Percentage; Polarstern; Polyamide; Polycaprolactone; Polycarbonate; Polyester; Polyethylene; Polyimide; Polylactic acid; Polypropylene; Polystyrene; Polyvinyl chloride; Project; PS85; PS85/426-3; PS85/472-2; PS92; PS92/032-4; PS92/039-6; PS94; PS94/054-1; Rubber; Sea ice salinity; Station label; Temperature, ice/snow; Varnish
    Type: dataset
    Format: text/tab-separated-values, 2758 data points
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    DATA PANGAEA
  • 4
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    Phaeocystis versus diatoms blooms in the ice covered European Arctic (2018)
    In:  EPIC3SCAR/IASC Open Science Conference & Open COMNAP Session, Davos, 2018-06-19-2018-06-23
    Details
    Publication Date: 2019-04-23
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
  • 5
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    High colored dissolved organic matter (CDOM) absorption in surface waters of the central-eastern Arctic Ocean: Implications for biogeochemistry and ocean color algorithms. (2018)
    PUBLIC LIBRARY SCIENCE
    In:  EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 13(1), pp. e0190838, ISSN: 1932-6203
    Details
    Publication Date: 2018-02-01
    Description: As consequences of global warming sea-ice shrinking, permafrost thawing and changes in fresh water and terrestrial material export have already been reported in the Arctic environment. These processes impact light penetration and primary production. To reach a better understanding of the current status and to provide accurate forecasts Arctic biogeochemical and physical parameters need to be extensively monitored. In this sense, bio-optical properties are useful to be measured due to the applicability of optical instrumentation to autonomous platforms, including satellites. This study characterizes the non-water absorbers and their coupling to hydrographic conditions in the poorly sampled surface waters of the central and eastern Arctic Ocean. Over the entire sampled area colored dissolved organic matter (CDOM) dominates the light absorption in surface waters. The distribution of CDOM, phytoplankton and non-algal particles absorption reproduces the hydrographic variability in this region of the Arctic Ocean which suggests a subdivision into five major bio-optical provinces: Laptev Sea Shelf, Laptev Sea, Central Arctic/Transpolar Drift, Beaufort Gyre and Eurasian/Nansen Basin. Evaluating ocean color algorithms commonly applied in the Arctic Ocean shows that global and regionally tuned empirical algorithms provide poor chlorophyll-a (Chl-a) estimates. The semi-analytical algorithms Generalized Inherent Optical Property model (GIOP) and Garver-Siegel-Maritorena (GSM), on the other hand, provide robust estimates of Chl-a and absorption of colored matter. Applying GSM with modifications proposed for the western Arctic Ocean produced reliable information on the absorption by colored matter, and specifically by CDOM. These findings highlight that only semi-analytical ocean color algorithms are able to identify with low uncertainty the distribution of the different optical water constituents in these high CDOM absorbing waters. In addition, a clustering of the Arctic Ocean into bio-optical provinces will help to develop and then select province-specific ocean color algorithms. © 2018 Gonçalves-Araujo et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 6
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    Organic sulphur compounds in sea ice and seawater in the central Arctic Ocean (2018)
    In:  EPIC3Ocean Sciences Meeting, Portland, USA, 2018-01-11-2018-02-16
    Details
    Publication Date: 2018-04-23
    Description: Dimethylsulfide (DMS) is a semi-volatile sulfur component and under discussion to be climate active, as its oxidation products might act as cloud condensation nuclei - thus cooling the atmosphere. DMS and its precursor dimethylsulfoniopropionate (DMSP) are frequently found in high concentrations in sea ice, since the unique and extreme physico-chemical conditions favour the production of both compounds by sea ice microalgae. Both compounds are cycled between the ice and underlying water column during melting and freezing processes and eventually DMS is released to the atmosphere. Data on DMS and DMSP in the high latitudes and particularly Arctic are scarce up to date. Our study presents profiles of DMS and DMSP in sea ice cores and the underlying water column collected during the Transarc II cruise on RV Polarstern in the central Arctic Ocean in late summer 2015. DMSP concentrations in sea ice with up to 200 nmol/L were often 10 to 100 times higher than typical seawater concentrations. In the underlying seawater higher DMSP concentrations were found in lower saline water, indicating DMSP release during melting in late summer. DMS concentrations in the ice were 2-3 times higher than typically found in open water. Sea ice profiles of DMS followed DMSP concentrations, but show indication of release of DMS to the underlying water column. The generally low DMS concentrations in the water indicate either rapid microbial cycling or exchange of this volatile compound to the atmosphere, e.g. through leads in the ice cover.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 7
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    Ballasting by cryogenic gypsum enhances carbon export in a Phaeocystis under-ice bloom (2018)
    Springer
    In:  EPIC3Scientific Reports, Springer, 8(7703)
    Details
    Publication Date: 2019-02-14
    Description: Mineral ballasting enhances carbon export from the surface to the deep ocean; however, little is known about the role of this process in the ice-covered Arctic Ocean. Here, we propose gypsum ballasting as a new mechanism that likely facilitated enhanced vertical carbon export from an under-ice phytoplankton bloom dominated by the haptophyte Phaeocystis. In the spring 2015 abundant gypsum crystals embedded in Phaeocystis aggregates were collected throughout the water column and on the sea floor at a depth below 2 km. Model predictions supported by isotopic signatures indicate that 2.7 g m−2 gypsum crystals were formed in sea ice at temperatures below −6.5°C and released into the water column during sea ice melting. Our finding indicates that sea ice derived (cryogenic) gypsum is stable enough to survive export to the deep ocean and serves as an effective ballast mineral. Our findings also suggest a potentially important and previously unknown role of Phaeocystis in deep carbon export due to cryogenic gypsum ballasting. The rapidly changing Arctic sea ice regime might favour this gypsum gravity chute with potential consequences for carbon export and food partitioning between pelagic and benthic ecosystems.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Warum finden wir Mikroplastik sogar im arktischen Meereis? (2018)
    In:  EPIC35. NWZ Abwasser-Dialog, 2018-08-28-2018-08-28
    Details
    Publication Date: 2019-04-18
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    The gypsum gravity chute to the Arctic abyss (2018)
    In:  EPIC3SCAR/IASC Open Science Conference & Open COMNAP Session, Davos, 2018-06-19-2018-06-23
    Details
    Publication Date: 2019-04-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 10
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    Arctic Sea ice: a transport vehicle and temporal sink for microplastic! (2018)
    In:  EPIC3SCAR/IASC Open Science Conference & Open COMNAP Session, Davos, 2018-06-19-2018-06-23
    Details
    Publication Date: 2019-04-18
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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