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  • 1
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    Heat loss from the Atlantic water layer in the northern Kara Sea: causes and consequences (2014)
    Copernicus Publications
    In:  EPIC3Ocean Science, Copernicus Publications, 10(4), pp. 719-730, ISSN: 1812-0792
    Details
    Publication Date: 2014-10-10
    Description: A distinct, subsurface density front along the eastern St. Anna Trough in the northern Kara Sea is inferred from hydrographic observations in 1996 and 2008–2010. Direct velocity measurements show a persistent northward subsurface current (~ 18 cm s−1) along the St. Anna Trough eastern flank. This sheared flow, carrying the outflow from the Barents and Kara seas to the Arctic Ocean, is also evident from shipboard observations as well as from geostrophic velocities and numerical model simulations. Although we cannot substantiate our conclusions by direct observation-based estimates of mixing rates in the area, we hypothesize that the enhanced vertical mixing along the St. Anna Trough eastern flank favors the upward heat loss from the intermediate warm Atlantic water layer. Modeling results support this hypothesis. The upward heat flux inferred from hydrographic data and model simulations is of O(30–100) W m−2. The region of lowered sea ice thickness and concentration seen both in sea ice remote sensing observations and model simulations marks the Atlantic water pathway in the St. Anna Trough and adjacent Nansen Basin continental margin. In fact, the sea ice shows a delayed freeze-up onset during fall and a reduction in the sea ice thickness during winter. This is consistent with our results on the enhanced Atlantic water heat loss along the Atlantic water pathway in the St. Anna Trough.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 2
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    Heat loss from the Atlantic water layer in the northern Kara Sea: causes and consequences (2014)
    Copernicus Publications (EGU)
    In:  Ocean Science, 10 (4). pp. 719-730.
    Details
    Publication Date: 2015-03-12
    Description: Dedicated to the memory of our colleague Klaus Hochheim, who tragically lost his life in the Arctic expedition in September 2013. A distinct, subsurface density front along the eastern St. Anna Trough in the northern Kara Sea is inferred from hydrographic observations in 1996 and 2008–2010. Direct velocity measurements show a persistent northward subsurface current (~ 18 cm s−1) along the St. Anna Trough eastern flank. This sheared flow, carrying the outflow from the Barents and Kara seas to the Arctic Ocean, is also evident from shipboard observations as well as from geostrophic velocities and numerical model simulations. Although we cannot substantiate our conclusions by direct observation-based estimates of mixing rates in the area, we hypothesize that the enhanced vertical mixing along the St. Anna Trough eastern flank favors the upward heat loss from the intermediate warm Atlantic water layer. Modeling results support this hypothesis. The upward heat flux inferred from hydrographic data and model simulations is of O(30–100) W m−2. The region of lowered sea ice thickness and concentration seen both in sea ice remote sensing observations and model simulations marks the Atlantic water pathway in the St. Anna Trough and adjacent Nansen Basin continental margin. In fact, the sea ice shows a delayed freeze-up onset during fall and a reduction in the sea ice thickness during winter. This is consistent with our results on the enhanced Atlantic water heat loss along the Atlantic water pathway in the St. Anna Trough.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/os-10-719-2014
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Heat loss from the Atlantic water layer in the St. Anna Trough (northern Kara Seas): causes and consequences (2013)
    In:  [Talk] In: Arctic Science Summit Week 2013, 13.-19.04.2013, Krakow, Poland .
    Details
    Publication Date: 2014-08-29
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 4
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    Spatio-temporal overlap of oil spills and early life stages of fish (2014)
    Oxford University Press
    Details
    Publication Date: 2014-05-20
    Description: Coupling an oil drift and fates model (Oscar) in an offline environment with an individual-based model (IBM) for Northeast Arctic cod ( Gadus morhua ) eggs and larvae enables us to quantify the exposure of eggs and larvae to oil from various oil spill scenarios. Oscar describes the spatio-temporal dispersal and fate of hydrocarbons, whereas the egg and larval IBM integrates the exposure of each individual. We can thus evaluate the effects of the time and location of an oil spill on the degree of exposure for individuals from different spawning grounds (SGs). In addition, we quantify how this effect is modified by the dynamic vertical positioning of eggs and the vertical behaviour of larvae. The principal findings of the study indicate that the mean egg and larval exposures for individuals from different SGs are highly dependent on the time and location of the spill and the vertical distribution of the offspring. Approximately 9.9, 4.7, 3.5, and 0.4% of the offspring would experience total polycyclic aromatic hydrocarbon (TPAH) concentrations above 1 µg l –1 (parts per billion, ppb) for oil spill scenarios situated at Haltenbanken, Lofoten, and Vesterålen near the coast and near the shelf edge, respectively, based on the maximum TPAH concentrations in the water column along the individual offspring trajectories.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press
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    PAPER CURRENT
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