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  • 1
    Online Resource
    Online Resource
    Die Arktische Oszillation im Kieler Klimamodell (2010)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: 34 Seiten = 1,4 MB)
    URL: http://oceanrep.geomar.de/11836
    Language: German
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 2
    Online Resource
    Online Resource
    Small-scale variability associated with mixing in the Denmark Strait Overflow plume based on horizontally profiling observations (2013)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: v, 109, IV Seiten = 34,9 MB)
    URL: http://oceanrep.geomar.de/22406/
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
    Online Resource
    Online Resource
    Advektive Pfade von Nährstoffen und ökologischen Schlüsselsubstanzen in der Arktis : Schlussbericht (2022)
    Bremerhaven : [Alfred-Wegener-Institute Helmholtz-Center for Polar and Marine Research]
    Details Availability
    Keywords: Forschungsbericht ; Nordpolarmeer ; Zirkulation ; Mengenelement ; Nährstoffeintrag
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (21 Seiten, 11,53 MB) , Diagramme, Karten
    URL: https://edocs.tib.eu/files/e01fb23/1860722377.pdf
    URL: https://doi.org/10.2314/KXP:1860722377
    DOI: 10.2314/KXP:1860722377
    Language: German
    Note: Förderkennzeichen BMBF 03F0807A [richtig] - 03V01461 [falsch] , Laufzeit: 01.07.2018 bis 31.12.2021 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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    GEOMAR CATALOGUE
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  • 4
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    Enhanced turbulence driven by mesoscale motions and flow-topography interaction in the Denmark Strait Overflow plume (2016)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Oceans, 121 (10). pp. 7650-7672.
    Details
    Publication Date: 2019-09-23
    Description: The Denmark Strait Overflow (DSO) contributes roughly half to the total volume transport of the Nordic overflows. The overflow increases its volume by entraining ambient water as it descends into the subpolar North Atlantic, feeding into the deep branch of the Atlantic Meridional Overturning Circulation. In June 2012, a multiplatform experiment was carried out in the DSO plume on the continental slope off Greenland (180 km downstream of the sill in Denmark Strait), to observe the variability associated with the entrainment of ambient waters into the DSO plume. In this study, we report on two high-dissipation events captured by an autonomous underwater vehicle (AUV) by horizontal profiling in the interfacial layer between the DSO plume and the ambient water. Strong dissipation of turbulent kinetic energy of O( math formula) W kg−1 was associated with enhanced small-scale temperature variance at wavelengths between 0.05 and 500 m as deduced from a fast-response thermistor. Isotherm displacement slope spectra reveal a wave number-dependence characteristic of turbulence in the inertial-convective subrange ( math formula) at wavelengths between 0.14 and 100 m. The first event captured by the AUV was transient, and occurred near the edge of a bottom-intensified energetic eddy. Our observations imply that both horizontal advection of warm water and vertical mixing of it into the plume are eddy-driven and go hand in hand in entraining ambient water into the DSO plume. The second event was found to be a stationary feature on the upstream side of a topographic elevation located in the plume pathway. Flow-topography interaction is suggested to drive the intense mixing at this site.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1002/2016JC011653
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Small-scale variability associated with mixing in the Denmark Strait Overflow plume based on horizontally profiling observations (2013)
    In:  (Master thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 109 pp
    Details
    Publication Date: 2013-11-12
    Keywords: Course of study: MSc Climate Physics
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 6
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    Sources and sinks of N2O in the subpolar and polar North Atlantic (2020)
    In:  [Talk] In: Ocean Sciences Meeting 2020, 16.-21.02.2020, San Diego, USA .
    Details
    Publication Date: 2020-03-04
    Description: The Arctic Ocean is particularly sensitive to climate change. Its ecosystem structure and function are prone to be disturbed by fast warming and massive retreat of sea-ice, which in turn, might result in feedbacks on climate. Moreover, such drastic changes are expected to influence the meridional fluxes of heat, freshwater and biogeochemical tracers between subpolar areas and the Arctic. As the third most important greenhouse gas and major ozone-depleting substance in the stratosphere, nitrous oxide (N2O) is a crucial gas to study in order to assess the ocean’s role in the production and exchange of climate-relevant compounds to the atmosphere. Between 2018 and 2019 we conducted ship-based surveys to elucidate the source-sink dynamics of N2O in the subpolar-polar North Atlantic. Based on results from those campaigns, we show the distribution and spatial variability of surface N2O, which ranged from moderate supersaturation (positive sea-air fluxes) in ice-free subpolar areas to unusually strong undersaturation (negative sea-air fluxes) in partially or fully ice-covered areas. We also present a comprehensive overview of the water column distribution of N2O in the region, and by combining this data with hydrographic and chemical (O2 and inorganic nutrients) information, we trace back the origin of the dominant water masses so as to illustrate the connectivity between the Fram Strait and the Nordic Seas off southeast Greenland. This analysis is used to discuss how the meridional water mass exchange in the region influences the balance of local vs. remote N2O production and its spatial variability. Furthermore, we use the results from collocated molecular analyses (functional gene markers) to infer the occurrence and abundances of the main microbial communities responsible for the cycling of N2O. This contribution is relevant for assessments of expected changes in trace gas emissions with further climate-driven changes in the Arctic Ocean.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 7
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    Pathways and sources of the warm Atlantic IntermediateWater in the trough system leading to the 79-North Glacier in a high resolution model (2018)
    In:  [Poster] In: EGU General Assembly 2018, 08.-13.04.2018, Vienna, Austria .
    Details
    Publication Date: 2019-01-08
    Description: More than 25% of mean global sea level rise is caused by mass loss of Greenland Ice Sheet (GrIS). A significant part of this melt is attributed to the interaction between marine terminating glaciers of the GrIS and the surrounding warm ocean waters. However, the sources and pathways of the warm waters on the shelf, their variability and mechanisms of the heat transfer involved are variable regionally and yet largely unknown. In this work, we focus on the 79-North Glacier (79-NG), a major glacier in North-East Greenland that was subject to an increased melt in the last years. Recent observations show that Atlantic Intermediate Water (AIW) warmer than 1°C reaches the 79NG via the trough system on the East Greenland continental shelf. In particular, these observations indicate that AIW reaches the glacier rather through the southern Norske Trough than through the northern Westwind Trough. Here we employ Lagrangian modelling and analysis using a high resolution FESOM (Finite Element Sea Ice-Ocean Model) simulation. Particle trajectories representing warm AIW mass are calculated to determine the pathways of this water mass on the adjacent shelf in the Norske Trough, and we analyze the water property changes along the trajectories. Moreover, to identify the sources of the AIW in the vicinity of the 79-NG, we compute backward particle trajectories.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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    OceanRep: Poster
  • 8
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    Pathways and sources of the warm Atlantic Intermediate Water in the trough system leading to the 79-North Glacier in a high resolution model (2018)
    In:  [Poster] In: EGU General Assembly 2018, 08.-13.04.2018, Vienna, Austria .
    Details
    Publication Date: 2020-04-08
    Description: More than 25% of mean global sea level rise is caused by mass loss of Greenland Ice Sheet (GrIS). A significant part of this melt is attributed to the interaction between marine terminating glaciers of the GrIS and the surrounding warm ocean waters. However, the sources and pathways of the warm waters on the shelf, their variability and mechanisms of the heat transfer involved are variable regionally and yet largely unknown. In this work, we focus on the 79-North Glacier (79-NG), a major glacier in North-East Greenland that was subject to an increased melt in the last years. Recent observations show that Atlantic Intermediate Water (AIW) warmer than 1°C reaches the 79NG via the trough system on the East Greenland continental shelf. In particular, these observations indicate that AIW reaches the glacier rather through the southern Norske Trough than through the northern Westwind Trough. Here we employ Lagrangian modelling and analysis using a high resolution FESOM (Finite Element Sea Ice-Ocean Model) simulation. Particle trajectories representing warm AIW mass are calculated to determine the pathways of this water mass on the adjacent shelf in the Norske Trough, and we analyze the water property changes along the trajectories. Moreover, to identify the sources of the AIW in the vicinity of the 79-NG, we compute backward particle trajectories
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Poster
  • 9
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    Pathways and fates of the warm Atlantic Intermediate Water toward 79NG Glacier Northeast Greenland (2018)
    In:  [Poster] In: AGU Fall Meeting 2018, 10.-14.12.2018, Washington, D.C., USA .
    Details
    Publication Date: 2020-04-08
    Description: More than 25% of mean global sea level rise is caused by mass loss of Greenland Ice Sheet (GrIS). A significant part of this melt is attributed to the interaction between marine terminating glaciers of the GrIS and the surrounding warm ocean waters. Recent moored and ship-based observations suggest that Atlantic Intermediate Water (AIW) warmer than 1°C reaches the 79NG via the trough system on the East Greenland continental shelf, and that the southern route through the Norske Trough, is preferred. The origins and pathways of these warm AIW are elusive however due sparseness of observations from this remote and harsh environment. Here we use a a high resolution FESOM (Finite Element Sea Ice-Ocean Model) and a suite of Lagrangian model and analysis tools to study the water pathways to the NEGIS and 79NG. We deploy 1915 Lagrangian particles at the Norske Trough and track them backwards to the Fram Strait and further, to the Atlantic and Arctic origins of these waters. The particle trajectories reveal that the warm water in the Trough is a mixture of three source waters: about 60% of particles crossed the northern section (80.64°N) towards the Arctic sea, about 20% crossed the Fram section (78.5°N) southward to the North Atlantic, and nearly 10% entered through an alternative route, the Westwind Trough. We calculate the travel time and water property changes of AIW along the trajectories. The released particles with temperature higher than 2°C reached Fram section after 200 days and colder water (1-2°C) take half this time (100 days). The interannual variability of particle crossings the Fram section has good agreement with the observed variability of AW temperature anomalies in Fram Strait at depth of 250m. Using Lagrangian statistics, we assess the role of the eddy mixing processes at the Fram Strait and that of the mesoscale recirculations in the Trough system.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Poster
  • 10
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    Disentangling pathways of warm Atlantic inflow to the 79-North Glacier with Lagrangian trajectories in a high resolution ocean model (2018)
    In:  [Paper] In: AGU Fall Meeting 2018, 10.-14.12.2018, Washington, D.C., USA .
    Details
    Publication Date: 2020-04-08
    Description: The 79-North Glacier (79-NG), a major glacier in North-East Greenland that was subject to an increased melt in the last years. The rate of ice loss by basal melting at marine-terminating glaciers is linked to the flow of warm water masses to the glacier that enhance basal melting. However, the sources and pathways of the warm waters on the shelf, their variability and mechanisms of the heat transfer involved are variable regionally and still clearly known. We use Lagrangian particle simulations based on output from a high resolution FESOM (Finite Element Sea Ice-Ocean Model) model to backtrack the source water masses of the warm water inflow to the 79NG. The Lagrangian particles visualize pathways of these waters. They also disclose intense eddy mixing processes in the Fram Strait and the vivid changes of temperature and salinity along the water mass trajectories.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Conference paper
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