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  • 1995-1999  (8)
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Year
  • 1
    Book
    Book
    The distribution of Delta 18 O in the arctic ocean : implications for the freshwater balance of the halocline and the sources of deep and bottom waters = Die Verteilung von Delta 18 O im arktischen Ozean (1995)
    Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung
    Details Availability
    Keywords: Buch Book ; Bericht Hochschulschrift ; Serienstueck ; Einteiler ; Hochschulschrift ; Forschungsbericht ; Arktis ; Meer ; Tiefenwasser ; Süßwasser ; Zirkulation ; Isotopenhäufigkeit ; Arktis ; Meer ; Oberflächenwasser ; Süßwasser ; Zirkulation ; Isotopenhäufigkeit ; Nordpolarmeer ; Salzgehalt ; Nordpolarmeer ; Sauerstoff-18 ; Nordpolarmeer ; Süßwasser
    Type of Medium: Book
    Pages: 144 S. , graph. Darst., Kt.
    Series Statement: Berichte zur Polarforschung 159
    URL: https://www.gbv.de/dms/tib-ub-hannover/183302672.pdf
    RVK:
    RY 20075
    RVK:
    WI 4430
    Language: English
    Note: Literaturverz. S. 109 -115 , Intermediärsprache: Deutsch , Teilw. zugl.: Heidelberg, Univ., Diss., 1994
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  • 2
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    Freshwater balance and the sources of deep and bottom waters in the Arctic Ocean inferred from the distribution of H218O (1995)
    Elsevier
    In:  Progress in Oceanography, 35 (1). pp. 53-80.
    Details
    Publication Date: 2020-06-05
    Description: Data from sections across the Eurasian Basin of the Arctic Ocean occupied in 1987 and 1991 are used to derive information on the freshwater balance of the Arctic Ocean and on sources of the deep waters of the Nansen, Amundsen and Makarov basins. Using salinity, H218O, and mass balances we estimate the river-runoff and the sea-ice melt water fractions contained in the upper waters of the Arctic Ocean and infer pathways of the river-runoff signal from the shelf seas across the central Arctic Ocean to Fram Strait. The average mean residence time of the river-runoff fraction contained in the Arctic Ocean halocline is determined to be about 11 to 14 years. Pacific water entering through Bering Strait is traced using silicate and its influence on the halocline waters of the Canadian Basin is estimated. Water column inventories of river-runoff and sea-ice melt water are calculated for a section just north of Fram Strait and implications of these inventories for sea-ice export through Fram Strait are discussed. Comparison of the ratios of shelf water, Atlantic water and the deep waters of the Arctic Ocean indicate that the sources of the deep and bottom waters of the Eurasian Basin are located in the Barents and Kara seas.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0079-6611(95)00005-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Oxygen isotope composition of living Neogloboquadrina pachyderma (sin.) in the Arctic Ocean (1997)
    Elsevier
    In:  Earth and Planetary Science Letters, 146 (1-2). pp. 47-58.
    Details
    Publication Date: 2016-11-14
    Description: Data from the Nansen Basin of the Arctic Ocean are used to investigate the habitat and conditions under which the polar planktic foraminifer Neogloboquadrina pachyderma (sin.) calcifies. The vertical distribution of δ18O values of net-sampled speciments, together with their abundances and proportion of calcification, are compared with δ18O values from both water samples and foraminiferal tests from core-top sediments. Within the Nansen Basin the average depth of habitat of N. pachyderma (sin.) changes from about 150 m in the southern part to about 80 m in the northern. The average depth of calcification, however, in both regimes varies between 100 and 200 m water depth. δ18O data from net sampled N. pachyderma (sin.) are directly reflected in the core-top sediment data, but compared to equilibrium calcite δ18O values derived from measurements of the ambient water, a consistent offset of about 1‰ over all depth intervals is observed. While in the southern part of the Nansen Basin advection through Fram Strait of planktic foraminifers from further south may play a role, the data from the northern part of the Nansen Basin give clear evidence that the observed offset in δ18O values is caused by a vital effect of N. pachyderma (sin.).
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0012-821X(96)00211-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    The potential transport of pollutants by Arctic sea ice (1995)
    Elsevier
    In:  Science of the Total Environment, 159 (2-3). pp. 129-146.
    Details
    Publication Date: 2016-09-08
    Description: Drifting sea ice in the Arctic may transport contaminants from coastal areas across the pole and release them during melting far from the source areas. Arctic sea ice often contains sediments entrained on the Siberian shelves and receives atmospheric deposition from Arctic haze. Elevated levels of some heavy metals (e.g. lead, iron, copper and cadmium) and organochlorines (e.g. PCBs and DDTs) have been observed in ice sampled in the Siberian seas, north of Svalbard, and in Baffin Bay. In order to determine the relative importance of sea ice transport in comparison with air/sea and oceanic processes, more data is required on pollutant entrainment and distribution in the Arctic ice pack.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0048-9697(95)04174-Y
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Moderne Studien zur Erfassung der Klimabedingungen der geologischen Vergangenheit (1999)
    Institut für Polarökologie Kiel
    In:  Mitteilungen zur Kieler Polarforschung, 15 . pp. 23-25.
    Details
    Publication Date: 2019-09-23
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 6
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    228Ra as a tracer for shelf water in the arctic ocean (1995)
    Elsevier
    In:  Deep-Sea Research Part II-Topical Studies in Oceanography, 42 (6). pp. 1533-1553.
    Details
    Publication Date: 2016-10-10
    Description: During its formation on the vast Siberian shelves, Arctic surface water is strongly enriched in 228Ra. When 228Ra of surface samples from the Arctic interior is plotted against the river water component fr, derived from salinity, δ180 and silicate as tracers, a shelfwater end-member can be calculated by extrapolation. Highest values occur in the core of the Transpolar Drift, indicating rapid transport of surface water, comparable to the known ice-drift pattern. Low values at Ice Island T3 are explained by radioactive decay (5.8 year half-life) during the long residence time of fresh and shelf-influenced water in the Beaufort Gyre. Some evidence of decay and, consequently, prolonged transit times is also observed in the southern Nansen Basin. Future research is required to establish the seasonal, interannual and spatial variability of 228Ra on the shelves in order to determine the full potential of 228Ra as a tracer for the origin and transport rates of shelfwater in the Arctic Basin. Apart from the usual 228Ra signature of bottom waters, the tracer is also observed in intermediate layers where it gives evidence of recent contact with slope or shelf sediments. The Atlantic Inflow along the Barents slope is enriched down to 2000 m. The return flow over the Amundsen Basin and Lomonosov Ridge carries a shelf signature of 228Ra and 228Th down to more than 1200 m depth, in agreement with the enrichment observed in 137Cs. Deeper maxima around 1900–2500 m in the Nansen Basin are interpreted as inflow of bottom water from the Norwegian Sea through Fram Strait.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0645(95)00053-4
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    The distribution of δ〈sup〉18〈/sup〉O in the Arctic Ocean: Implications for the freshwater balance of the halocline and the sources of deep and bottom waters = Die Verteilung von δ〈sup〉18〈/sup〉O im Arktischen Ozean: Implikationen für die Süßwasserbilanz der Halokline und die Quellen des Tiefen- und Bodenwassers (1995)
    Alfred-Wegener-Institut für Polarforschung
    In:  (PhD/ Doctoral thesis), Universität Heidelberg, Heidelberg, 144 pp . Berichte zur Polarforschung, 159 . DOI 10.2312/BzP_0159_1995 〈http://dx.doi.org/10.2312/BzP_0159_1995〉.
    Details
    Publication Date: 2019-07-25
    Type: Thesis , NonPeerReviewed
    Format: text
    DOI: 10.2312/BzP_0159_1995
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    OceanRep: Thesis - not published by a publisher
  • 8
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    Physical and chemical oceanography in the Arctic Ocean (1995)
    PANGAEA
    In:  Supplement to: Bauch, Dorothea (1995): The distribution of d18O in the Arctic Ocean: implications for the freshwater balance of the halocline and the sources of deep and bottom waters (Die Verteilung von d18O im Arktischen Ozean: Implikationen für die Süßwasserbilanz der Halokline und die Quellen des Tiefen- und Bodenwassers). Berichte zur Polarforschung = Reports on Polar Research, 159, 144 pp, https://doi.org/10.2312/BzP_0159_1995
    Details
    Publication Date: 2024-04-16
    Description: Data from sections across the Eurasian Basin of the Arctic Ocean occupied by the German Research Vessel Polarstern in 1987 and by the Swedish icebreaker Oden in 1991 are used to derive information on the freshwater balance of the Arctic Ocean halocline and on the sources of the deep waters of the Nansen, Amundsen and Makarov basins. Salinity, d18O and mass balances allow separation of the river-runoff and the sea-ice meltwater fractions contained in the Arctic halocline. This provides the basis for tracking the river-runoff signal from the shelf seas across the central Arctic Ocean to Fram Strait. The halocline has to be divided into at least three lateral regimes: the southern Nansen Basin with net sea-ice melting, the northern Nansen Basin and Amundsen Basin with net sea-ice formation and increasing river-runoff fractions, and the Canadian Basin with minimum sea-ice meltwater and maximum river-runoff fractions and water of Pacific origin. In the Canadian Basin, silicate is used as a tracer to identify Pacific water entering through Bering Strait and an attempt is made to quantify its influence on the halocline waters of the Canadian Basin. For this purpose literature data from the CESAR and LOREX ice camps are used. Based on mass balances and depending on the value of precipitation over the area of the Arctic Ocean the average mean residence time of the river-runoff fraction contained in the Arctic Ocean halocline is determined to be about 14 or 11 years. Water column inventories of river-runoff and sea-ice meltwater are calculated for a section just north of Fram Strait and implications for the ice export rate through Fram Strait are discussed. Salinity, tritium, 3He and the d18O ratio of halocline waters sampled during the 1987 Polarstern cruise to the Nansen Basin are used to estimate the mean residence time of the river-runoff component in the halocline and on the shelves of the Arctic Ocean. These estimates are done by comparing ages of the halocline waters based on a combination of tracers yielding different time information: the tritium 'vintage' age which records the time that has passed since the river-runoff entered the shelf and the tritium/3He age which reflects the time since the shelf waters left the shelf. The difference between the ages determined by these two methods is about 3 to 6 years. Correction for the initial tritium/3He age of the shelf waters (about 0.5 to 1.5 years) yields a mean residence time of the river-runoff on the shelves of about 3.5 ± 2 years. Comparison of the 18O/16O ratios of shelf water, Atlantic water and the deep waters of the Arctic Ocean indicate that the sources of the deep and bottom waters of the Eurasian Basin are located in the Barents and Kara seas.
    Keywords: 91004; 91008; Arctic Ocean; ARK-IV/2; ARK-IV/3; AWI_Paleo; Chejsa Island; CTD/Rosette; CTD-RO; Dalniye Zelentsy; DZ-68; DZ-68_1; DZ-68_10; DZ-68_11; DZ-68_12; DZ-68_13; DZ-68_14; DZ-68_15; DZ-68_16; DZ-68_2; DZ-68_3; DZ-68_5; DZ-68_8; DZ-68_9; E.S.A.R.E.92; ESARE92/14; ESARE92/17; ESARE92/2; ESARE92/3; ESARE92/4; ESARE92/5; ESARE92/6; ESARE92/7; ESARE92/8; Green Bell Island; Greenland Sea; M71; M71_79; M8/1; M8/1_617; Meteor (1964); Meteor (1986); MULT; Multiple investigations; Nordenskiöld Bay; North Greenland Sea; OD91; OD91_004; OD91_008; OD91_009-1; OD91_010-1; OD91_011-1; OD91_012-1; OD91_014-1; OD91_016-1; OD91_017-1; OD91_018-1; OD91_021-1; OD91_023-1; OD91_026-1; OD91_031-1; OD91_033-1; OD91_043-1; OD91_046-1; OD91_048-1; OD91_049-1; OD91_051-1; OD91_055-1; OD91_058-1; OD91_061-1; Oden; off Franz-Josef-Land; off Novaya Zemlya; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS11; PS11/185-1; PS11/187-1; PS11/188-1; PS11/189-1; PS11/190-1; PS11/191-1; PS11/193-1; PS11/194-1; PS11/195-1; PS11/219-1; PS11/220-1; PS11/221-1; PS11/222-1; PS11/223-1; PS11/224-1; PS11/225-1; PS11/226-1; PS11/227-1; PS11/245-1; PS11/246-1; PS11/247-1; PS11/248-1; PS11/249-1; PS11/250-1; PS11/251-1; PS11/252-1; PS11/253-1; PS11/269-1; PS11/285-1; PS11/287-1; PS11/310; PS11/340; PS11/358; PS11/362; PS11/364; PS11/365; PS11/371; Quaternary Environment of the Eurasian North; QUEEN; Sampling/drilling ice; Silicon Cycling in the World Ocean; SINOPS; SNOW; Snow/ice sample; Surface water sample; SWS; Water sample; Wilczek Island; WS
    Type: Dataset
    Format: application/zip, 6 datasets
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    DATA PANGAEA
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