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  • 1
    Call number: ZS-090(455) ; ZSP-168-455
    In: Berichte zur Polar- und Meeresforschung
    Type of Medium: Series available for loan
    Pages: IV, 87 S.
    ISSN: 1618-3193
    Series Statement: Berichte zur Polar- und Meeresforschung 455
    Classification: D.3.
    Location: Lower compact magazine
    Location: Reading room
    Branch Library: GFZ Library
    Branch Library: AWI Library
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  • 2
    Publication Date: 2016-10-12
    Description: The Arctic in Rapid Transition (ART) network in cooperation with the Association of Polar Early Career Scientists (APECS) and European Institute for Marine Science (IUEM) organized an international multidisciplinary science workshop “Integrating spatial and temporal scales in the changing Arctic System: towards future research priorities” (ISTAS) in October 2014. The workshop aimed at discussing future priorities of Arctic research from an early career scientists’ perspective. In total, 76 scientists from thirteen different countries participated in the workshop, 60% of them were early to mid-career researchers. In plenary and parallel sessions, trends and variability in the Arctic marine and coastal systems were reviewed over various spatial and temporal scales in order to better understand the presently changing Arctic system as a whole. Participants presented the newest results of their ongoing research, which eventually fed into comprehensive discussions on future Arctic research priorities on biological and physical oceanography, sea ice, marine biodiversity, land-ocean interactions, paleo-reconstruction and biological archives, as well as law and economics. Here we present the fact sheets, the main outcome of the workshop which highlights the research directions from the perspective of early career scientists. This is of great importance to ensure the involvement of the next generation of Arctic researchers and their contribution to the ICARP III process.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , NonPeerReviewed
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  • 3
    Publication Date: 2016-10-12
    Description: Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and coastal erosion. This material is further distributed across the Arctic by ocean currents and sea ice. The coastal regions are particularly vulnerable to changes related to recent climate change. We compiled a pan-arctic review that looks into the changing Holocene sources, transport processes and sinks of terrigenous sediment in the Arctic Ocean. Existing paleoceanographic studies demonstrate how climate warming and the disappearance of ice sheets during the early Holocene initiated eustatic sea-level rise that greatly modified the physiography of the Arctic Ocean. Sedimentation rates over the shelves and slopes were much greater during periods of rapid sea-level rise in the early and middle Holocene, due to the relative distance to the terrestrial sediment sources. However, estimates of suspended sediment delivery through major Arctic rivers do not indicate enhanced delivery during this time, thus, suggesting enhanced rates of coastal erosion. The increased supply of terrigenous material to the outer shelves and deep Arctic Ocean in the early and middle Holocene might serve as analogous to forecast changes in the future Arctic.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 4
    Publication Date: 2017-09-13
    Description: A multi-year mooring record (2007-2014) and satellite imagery highlight the strong temperature variability and unique hydrographic nature of the Laptev Sea. This Arctic shelf is a key region for river discharge and sea ice formation and export, and includes submarine permafrost and methane deposits, which emphasizes the need to understand the thermal variability near the seafloor. Recent years were characterized by early ice retreat and a warming near-shore environment. However, warming was not observed on the deeper shelf until year-round under-ice measurements recorded unprecedented warm near-bottom waters of +0.6°C in winter 2012/2013, just after the Arctic sea ice extent featured a record minimum. In the Laptev Sea, early ice retreat in 2012 combined with Lena River heat and solar radiation produced anomalously warm summer surface waters, which were vertically mixed, trapped in the pycnocline, and subsequently transferred toward the bottom until the water column cooled when brine rejection eroded stratification.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 5
  • 6
    Publication Date: 2015-04-27
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 7
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    In:  [Invited talk] In: International Conference on Arctic Research Planning, ICARP II, 10.11.-12.11, Copenhagen, Denmark .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 8
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    Alfred-Wegener-Institut für Polar- und Meeresforschung
    In:  (Doctoral thesis/PhD), Christian-Albrechts-Universität zu Kiel, GEOMAR Forschungszentrum für Marine Geowissenschaften, Kiel, Kiel, IV, 87 pp . Berichte zur Polar- und Meeresforschung, 455 . DOI hdl:10013/epic.10460.d001.
    Publication Date: 2015-04-07
    Description: The main objective of the study was to investigate seasonal sediment dynarnics on the Laptev Sea shelf. The Laptev Sea comprises one of the largest Siberian shelf areas and is characterized by seasonal ice coverage and thus, by a strong seasonality in sediment input. The pathways and the final fate of the sediments derived from the Siberian hinterland are central questions for understanding the complex land-shelf-ocean interactions and their seasonal variations. In order to characterize seasonal variations in suspended particulate matter (SPM) dynamics on the eastem Laptev Sea shelf, one-year Acoustic Doppler Current Profiler (ADCP) records and complementary optical backscatter profiles from the ice-free period were analyzed. In order to use indirect measuring devices for the quantification of SPM concentration, optical (turbidity meter) and acoustic (ADCP) backscatter sensors were compared to assess their potential for the investigation of SPM dynamics on the Laptev Sea shelf. To estimate SPM concentrations from optical backscatter signals, these were converted using the linear relation between the backscatter signals and SPM concentrations derived from filtered water samples. Applying the theoretical interaction of sound in the water to SPM, the acoustic backscatter signals were transformed adapting a previously established approach. SPM concentrations estimated from the backscattered signals of both sensors showed a close similarity to SPM concentrations obtained from filtered water samples. In general both the ADCPs and the turbidity meters provided good estimations, with ADCPs underestimating and turbidity meters slightly overestimating SPM concentrations. Hence, both sensors can be used for the deterrnination of SPM dynamics On the Laptev Sea shelf with its comparably low SPM concentrations. However, ADCPs are more convenient for investigation of sediment transport dynamics as they provide reasonable SPM concentration and current records for the entire water colurnn simultaneously. Combined turbidity meter, pigment, plankton, and current records were analyzed to describe the con~positiont,r ansport dynamics, and short-term variability of SPM in the nepheloid layers (i.e., layers of increased SPM concentration in the water column) during the ice-free period. The combined measurements indicate that most of the sediment transport takes place in the bottom nepheloid layer On the eastem and the central Laptev Sea shelf. The bottom nepheloid layer comprises riverine material, resuspended bottom material, and decaying organic matter from the upper water column. The SPM concentration within the bottom nepheloid layer decreases from south to north and from east to west, respectively, mainly due to dispersion. On the inner shelf in the vicinity of the Lena Delta the SPM concentration in the surface nepheloid layer is strongly dependent On riverine discharge. On the mid-shelf the formation and dynamics of the surface layer are mainly related to changes in phytoplankton biomass and zooplankton migration. On the eastem Laptev Sea shelf paleo-river valleys act as transport conduits during the ice-free period, where bottom material is resuspended On the mid-shelf during and after storm events and transported onto the inner shelf. On the central Laptev Sea shelf resuspension events seem to be less common and SPM is mainly transported over the continental margin into the deep Arctic Ocean. To investigate seasonal variations in SPM dynamics on the eastem Laptev Sea shelf, one-year records On currents and SPM concentrations were examined. The data indicated that during and shortly after the river-ice breakup (June to early July) sediment transport on the inner shelf is dominated by riverine input and transport onto the mid-shelf within the surface nepheloid layer. When ice-free conditions prevail (mid-July to September), SPM is mainly trapped on the eastern Laptev Sea shelf: SPM discharged by the Lena River is transported within the surface layer onto the mid-shelf, where it sinks through the water column into the bottom nepheloid layer. In the bottom layer it is transported back onto the inner shelf with additional bottom material, which was resuspended during and after storm events. On the inner shelf the material is partly conveyed back into the surface layer by turbid mixing and carried out onto the shelf again. During freeze-up (October) SPM in the surface layer on the inner shelf is rather incorporated into newly formed ice and partly transported with the ice over the continental margin into the deep Arctic Ocean. Beneath the ice Cover (November to JuneIJuly) on the inner shelf SPM slowly sinks and sediment transport is of minor importance. However, beneath the polynya bottom material is still resuspended after storrn events and transported onto the inner shelf where it temporarily settles. The data suggest a quasi-estuarine sediment circulation and a sediment export dominated by ice export rather than bottom transport on the eastem Laptev Sea shelf. Since for the first time currents and SPM concentrations were recorded simultaneously for a one-year period, the unique dataset gave new insights into sediment dynamics on the Laptev Sea shelf and its complex land-shelf-ocean interactions. The data provided the basis for a conceptual model of sediment transport on the Laptev Sea shelf, which emphasizes the significance of sea ice export for the sediment budget of the Laptev Sea shelf and as a sediment source for the deep Arctic Ocean. The conceptual model can presumably be extended to other Siberian shelf seas.
    Type: Thesis , NonPeerReviewed
    Format: text
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  • 9
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    In:  [Talk] In: APEX Fifth International Conference and Workshop: Quaternary Glacial and Climate Extremes, 01.06.-04.06. 2011, Longyearbyen, Svalbard, Norway . APEX Fifth International Conference and Workshop: Quaternary Glacial and Climate Extremes / hosted by The University Centre in Svalbard (UNIS) ; p. 63 .
    Publication Date: 2014-12-22
    Description: The Arctic is undergoing rapid environmental and economic transformations. Recent climate warming, which is simplifying access to oil and gas resources, enabling trans-Arctic shipping, and shifting the distribution of harvestable resources, has brought the Arctic Ocean to the top of national and international political agendas. Scientific knowledge of the present status of the Arctic Ocean and the process-based understanding of the mechanics of change are urgently needed to make useful predictions of future conditions throughout the Arctic region. These are required to plan for the consequences of climate change. A step towards improving our capacity to predict future Arctic change was undertaken with the Second International Conference on Arctic Research Planning (ICARP II) meetings in 2005 and 2006, which brought together scientists, policymakers, research managers, Arctic residents, and other stakeholders interested in the future of the Arctic region. The Arctic in Rapid Transition (ART) Initiative developed out of the synthesis of the several resulting ICARP II science plans specific to the marine environment. This process started in October 2008 and has been driven by early career scientists. The ART Initiative is an integrative, international, multi-disciplinary, long-term pan-Arctic network to study changes and feedbacks with respect to physical characteristics and biogeochemical cycles in the Arctic Ocean in a state of rapid transition and its impact on the biological production. The first ART workshop was held in Fairbanks, Alaska, in November 2009 with 58 participants from 9 countries. Workshop discussions and reports were used to develop a science plan that integrates, updates, and develops priorities for Arctic Marine Science over the next decade. The science plan was accepted and approved by the International Arctic Science Committee (IASC) Marine Group, the former Arctic Ocean Science Board. The second ART workshop was held in Winnipeg, Canada, in October 2010 with 20 participants from 7 countries to develop the implementation plan. Our focus within the ART Initiative will be to bridge gaps in knowledge not only across disciplinary boundaries (e.g., biology, geochemistry, geology, meteorology, physical oceanography), but also across geographic (e.g., international boundaries, shelves, margins, and the central Arctic Ocean) and temporal boundaries (e.g., palaeo/geologic records, current process observations, and future modeling studies). This approach of the ART Initiative will provide a means to better understand and predict change, particularly the consequences for biological productivity, and ultimate responses in the Arctic Ocean system. More information about the ART Initiative can be found at http://aosb.arcticportal.org/art.html.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 10
    Publication Date: 2017-12-19
    Description: Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and coastal erosion. This material is further distributed across the Arctic by ocean currents and sea ice. The coastal regions are particularly vulnerable to changes related to recent climate change. We compiled a pan-Arctic review that looks into the changing Holocene sources, transport processes and sinks of terrigenous sediment in the Arctic Ocean. Existing palaeoceanographic studies demonstrate how climate warming and the disappearance of ice sheets during the early Holocene initiated eustatic sea-level rise that greatly modified the physiography of the Arctic Ocean. Sedimentation rates over the shelves and slopes were much greater during periods of rapid sea-level rise in the early and middle Holocene, as a result of the relative distance to the terrestrial sediment sources. However, estimates of suspended sediment delivery through major Arctic rivers do not indicate enhanced delivery during this time, which suggests enhanced rates of coastal erosion. The increased supply of terrigenous material to the outer shelves and deep Arctic Ocean in the early and middle Holocene might serve as analogous to forecast changes in the future Arctic.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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