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  • 2010-2014  (103)
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  • 1
    Online Resource
    Online Resource
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Type of Medium: Online Resource
    Pages: Online-Ressource (66 S.) , Ill., graph. Darst., Kt.
    Series Statement: Berichte zur Polar- und Meeresforschung 658
    Language: English
    Note: Zsfassung in dt. und engl. Sprache
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Description / Table of Contents: Der zweite Fahrtabschnitt der 25. Expedition des Forschungsschiffes Polarstern begann am 30. Juni 2010 in Longyearbyen auf Spitzbergen, führte über das Tiefsee-Observatorium HAUSGARTEN in der östlichen Framstraße und den ozeanographischen Transekt bei 78ʿ50’N bis etwa 12ʿ30’W und endete am 29. Juli 2010 in Reykjavik, Island...Die im Bereich des Tiefsee-Observatoriums HAUSGARTEN durchgeführten Arbeiten tragen zum Forschungsprogramm PACES (Polar regions and coasts in the changing earth system) des AWI bei und leisten darüber hinaus Beiträge zu den EU-Projekten ESONET, HERMIONE und HYPOX. Im Rahmen der HAUSGARTEN-Arbeiten wird seit nunmehr über 10 Jahren der Einfluss klimatisch induzierter Veränderungen auf das marine, arktische Ökosystem dokumentiert...Die in das EU-Projekt ACOBAR (Acoustic technology for observing the interior of the Arctic Ocean) eingebetteten ozeanographischen Arbeiten hatten zum Ziel, Änderungen des Wassermassen- und Wärmeaustauschs zwischen dem Nordpolarmeer und dem nördlichen Atlantik und die Zirkulation in der Framstraße zu quantifizieren...
    Type of Medium: Online Resource
    Pages: Online-Ressource
    Series Statement: Berichte zur Polar- und Meeresforschung 624
    Language: English
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  • 3
    Publication Date: 2015-03-13
    Type: Article , NonPeerReviewed
    Format: text
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  • 4
    Publication Date: 2015-08-03
    Description: Our ability to understand the complex interactions of biological, chemical, physical, and geological processes in the ocean and on land is still limited by the lack of integrative and interdisciplinary observation infrastructures. The main purpose of the planned open-ocean infrastructure FRAM (FRontiers in Arctic marine Monitoring) is permanent presence at sea, from surface to depth, for the provision of near real-time data on climate variability and ecosystem change in a marine Arctic system. The Alfred-Wegener-Institut - Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), together with partner institutes in Germany and Europe, aims at providing such infrastructure for the polar ocean as a major contribution to the grand challenges of Earth observation and environmental status. The FRAM Ocean Observing System targets the gateway between the North Atlantic and the Central Arctic, representing a highly climate-sensitive and rapidly changing region of the Earth system. It will serve national and international tasks towards a better understanding of the effects of change in ocean circulation, water mass properties and sea-ice retreat on Arctic marine ecosystems and their main functions and services. FRAM will implement existing and nextgeneration sensors and observatory platforms, allowing synchronous observation of relevant ocean variables, as well as the study of physical, chemical and biological processes in the water column and at the seafloor. Experimental and event-triggered platforms will complement observational platforms. Products of the infrastructure are continuous long-term data with appropriate resolution in space and time, as well as ground-truthing information for ocean models and remote sensing. FRAM will integrate and develop already existing observatories, i.e. the oceanographic mooring array HAFOS (Hybrid Arctic/Antarctic Float Observing System) and the Long-Term Ecological Research (LTER) site HAUSGARTEN.
    Type: Conference or Workshop Item , PeerReviewed
    Format: text
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  • 5
    Publication Date: 2024-01-01
    Description: Deep-sea benthic communities and their structural and functional characteristics are regulated by surface water processes. Our study focused on the impact of changes in water depth and food supplies on small-sized metazoan bottom-fauna (meiobenthos) along a bathymetric transect (1200–5500 m) in the western Fram Strait. The samples were collected every summer season from 2005 to 2009 within the scope of the HAUSGARTEN monitoring program. In comparison to other polar regions, the large inflow of organic matter to the sea floor translates into relatively high meiofaunal densities in this region. Densities along the bathymetric gradient range from approximately 2400 ind. 10 cm-2 at 1200 m to approximately 300 ind. 10 cm-2 at 4000 m. Differences in meiofaunal distribution among sediment layers (i.e., vertical profile) were stronger than among stations (i.e., bathymetric gradient). At all the stations meiofaunal densities and number of taxa were the highest in the surface sediment layer (0–1 cm), and these decreased with increasing sediment depth (down to 4–5 cm). However, the shape of the decreasing pattern differed significantly among stations. Meiofaunal densities and taxonomic richness decreased gradually with increasing sediment depth at the shallower stations with higher food availability. At deeper stations, where the availability of organic matter is generally lower, meiofaunal densities decreased sharply to minor proportions at sediment depths already at 2–3 cm. Nematodes were the most abundant organisms (60–98%) in all the sediment layers. The environmental factors best correlated to the vertical patterns of the meiofaunal community were sediment-bound chloroplastic pigments that indicate phytodetrital matter. Highlights • Small-scale heterogeneity is the main source of variation in meiofauna community. • Trophic conditions influence vertical patterns of meiofauna distribution. • Meiofauna abundance and biomass decrease with increasing water depth.
    Type: Article , PeerReviewed
    Format: text
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  • 6
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    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2023-03-16
    Keywords: ARK-XXV/2; AWI_PhyOce; CT; DATE/TIME; DEPTH, water; Fram Strait; LATITUDE; LONGITUDE; Physical Oceanography @ AWI; Polarstern; PS76; PS76/2-track; Salinity; Temperature, water; Thermosalinograph; TSG; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 5204 data points
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  • 7
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    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2023-03-16
    Keywords: ARK-XXVII/2; AWI_PhyOce; CT; DATE/TIME; DEPTH, water; Fram Strait; LATITUDE; LONGITUDE; Physical Oceanography @ AWI; Polarstern; PS80; PS80/2-track; Salinity; Temperature, water; Thermosalinograph; TSG; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 2198 data points
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  • 8
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    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2023-03-16
    Keywords: ARK-XXVII/2; Calculated; Course; CT; DATE/TIME; Fram Strait; LATITUDE; LONGITUDE; Polarstern; PS80; PS80/2-track; Speed; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 4584 data points
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  • 9
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    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2023-03-16
    Keywords: ARK-XXVII/2; Attenuation, optical beam transmission; AWI_PhyOce; Calculated; Computed; Conductivity; CTD, SEA-BIRD SBE 911plus, SN T1338-C1199; CTD/Rosette; CTD-RO; Date/Time of event; Density, sigma-theta (0); DEPTH, water; Elevation of event; Event label; Fluorometer; Fluorometer, WET Labs ECO FLRTD; HG_I; HG_IV; HG_IX; Latitude of event; Longitude of event; N4; North Greenland Sea; Number of observations; Oxygen; Oxygen saturation; Oxygen sensor, SBE 43; Physical Oceanography @ AWI; Polarstern; Pressure, water; PS80; PS80/165-2; PS80/166-1; PS80/167-2; PS80/168-3; PS80/169-1; PS80/170-2; PS80/171-1; PS80/172-1; PS80/173-2; PS80/175-1; PS80/176-3; PS80/178-1; PS80/180-1; PS80/181-1; PS80/182-1; PS80/183-1; PS80/184-1; PS80/185-4; PS80/186-1; PS80/187-1; PS80/188-1; PS80/189-2; PS80/191-1; PS80/194-1; S3; Salinity; Temperature, water; Temperature, water, potential
    Type: Dataset
    Format: text/tab-separated-values, 537690 data points
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  • 10
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    PANGAEA
    In:  Supplement to: Freese, Daniela; Schewe, Ingo; Kanzog, Corinna; Soltwedel, Thomas; Klages, Michael (2012): Recolonisation of new habitats by meiobenthic organisms in the deep Arctic Ocean: an experimental approach. Polar Biology, 35(12), 1801-1813, https://doi.org/10.1007/s00300-012-1223-2
    Publication Date: 2023-03-16
    Description: Commercial exploitation and abrupt changes of the natural conditions may have severe impacts on the Arctic deep-sea ecosystem. The present recolonisation experiment mimicked a situation after a catastrophic disturbance (e.g. by turbidites caused by destabilized continental slopes after methane hydrate decomposition) and investigated if the recolonisation of a deep-sea habitat by meiobenthic organisms is fostered by variations innutrition and/or sediment structure. Two "Sediment Tray Free Vehicles" were deployed for one year in summer 2003 at 2500 m water depth in the Arctic deep-sea in the eastern Fram Strait. The recolonisation trays were filled with different artificial and natural sediment types (glass beads, sand, sediment mixture, pure deep-sea sediment) and were enriched with various types of food (algae, yeast, fish). After one year, meiobenthos abundances and various sediment related environmental parameters were investigated. Foraminifera were generally the most successful group: they dominated all treatments and accounted for about 87% of the total meiobenthos. Colonizing meiobenthos specimens were generally smaller compared to those in the surrounding deep-sea sediment, suggesting an active recolonisation by juveniles. Although experimental treatments with fine-grained, algae-enriched sediment showed abundances closest to natural conditions, the results suggest that food availability was the main determining factor for a successful recolonisation by meiobenthos and the structure of recolonised sediments was shown to have a subordinate influence.
    Keywords: ARK-XIX/3c; Hausgarten; HERMIONE; Hotspot Ecosystem Research and Mans Impact On European Seas; Long-term Investigation at AWI-Hausgarten off Svalbard; North Greenland Sea; Polarstern; PS64; PS64/474-1; PS64/475-1; Sediment tray free vehicle; STFV
    Type: Dataset
    Format: application/zip, 2 datasets
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