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  • 1
    Book
    Book
    Untersuchungen zu den tiefen Wassermassen und planktologische Beobachtungen im tropischen Westpazifik während der SONNE-Fahrt Nr. 113 (TROPAC) (1997)
    Kiel : Inst. für Meereskunde, Abt. Meeresphysik
    Details Availability
    Keywords: Forschungsbericht ; Hochschulschrift
    Description / Table of Contents: Das deutsche Forschungsschiff SONNE war während der Fahrt Nr 113 (TROPAC) vom 10 Oktober - 19 November 1996 im westlichen tropischen Pazifik im Einsatz. Das Untersuchungsgebiet lag im Östlichen Marianenbecken und im Östlichen Karolinenbecken. Das physikalisch/chemische Programm hatte zwei Schwerpunkte a) Untersuchungen zur Zirkulation von Antarktischem Zwischenwasser in der Bismarck- See und längs des Äquators zwischen 143° und 150°E und b) zur Struktur und zum Transport von unterem zirkumpolaren Tiefenwasser im Marianenbecken. (MOD)
    Type of Medium: Book
    Pages: 129 S , graph. Darst., Kt
    Series Statement: Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel 288
    Language: German
    Note: Förderkennzeichen BMBF 03G0113A
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  • 2
    Book
    Book
    SI-Einheiten in der Ozeanographie : = SI units in oceanography (1998)
    Kiel : Inst. für Meereskunde, Abt. Meeresphysik
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    Keywords: Meereskunde ; SI-Einheiten
    Description / Table of Contents: Die Zusammenstellung zu den SI-Einheiten soll eine praktische Arbeitsgrundlage für die Verwendung dieser Einheiten in der Ozeanographie bereitstellen. Sie paßt die grundlegenden Vorschriften des SI-Systems (Système International d'Unités) und die vom UNESCO/ICES/SCOR/IAPSO-Ausschuß "Ozeanographische Tabelle und Standards" (JPOTS) erarbeiteten Regeln für die Anwendung in der Ozeanographie zusammen. Grundlagen sind der SUN Report (IAPSO, 1979), die IAPSO-Publication Scientifique No. 32, veröffentlicht bei der UNESCO (1985) und die Empfehlungen der genannten internationalen Meeresforschungsorganisationen zum "Praktischen Salzgehalt" und zur neuen Zustandsgleichung des Meerwassers (UNESCO, 1981, 1983). Außerdem werden Angaben zur neuen internationalen Temperaturskala gegeben (SAUNDERS, 1990). Der Bericht enthält ferner eine Zusammenfassung von Größen und Einheiten zur Strahlungsenergieübertragung im Meer. Die 3. Auflage wurde gegenüber der 2. Auflage vor allem durch Erläuterungen zu oft gebrauchten Bezeichnungen ergänzt. Bei den Strahlungsgrößen wurden einige Bezeichnungen entsprechend dem überwiegend üblichen Gebrauch verändert bzw. hinzugefügt, und einige Fehler wurden korrigiert.
    Type of Medium: Book
    Pages: 18 S , graph. Darst.
    Edition: 3. überarb. Aufl
    Series Statement: Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel 101
    Language: German , English
    Note: Text in dt. u. engl. Sprache
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  • 3
    Book
    Book
    Die Zirkulation des Oberflächen- und Tiefenwassers im Südlichen Brasilianischen Becken (1995)
    Kiel : Inst. für Meereskunde, Abt. Meeresphysik
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    Keywords: Report ; Dissertation ; Forschungsbericht ; Hochschulschrift
    Type of Medium: Book
    Pages: IV, 142 S. , Ill., graph. Darst., Kt.
    Series Statement: Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel 281
    Language: German
    Note: Literaturverz. S. 128 - 135 , Zugl.: Kiel, Univ., Diss., 1995
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  • 4
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    The Namib Col Current (1995)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 42 (11-12). pp. 1933-1950.
    Details
    Publication Date: 2018-03-08
    Description: Recent measurements indicate the transatlantic extent of the Namib Col Current at depths of 1300-3000 m near Lat. 22 degrees S in the South Atlantic Ocean. This current forms a continuous circulation structure from the Namib Col on the Walvis Ridge to the western trough, though its characteristic change as deepwater with varying properties enters and leaves the current owing to a meridional flow component. Transport estimates from hydrographic sections on the Walvis Ridge and at 15 degrees W near the crest of the Mid-Atlantic Ridge indicate a strength of about 3 x 10(6) m(3) s(-1) The current is part of a larger-scale eastward Row at Lon. 25 degrees W; transport estimates across the salinity maximum core there show a similar strength. Associated with this high-salinity high-oxygen current is a basin-wide front in these properties of varying intensity (weaker in the east) marking the transition to deep water whose North Atlantic characteristics have been partly erased by mixing with Circumpolar Deep Water in the southwest South Atlantic. The water which finally crosses the Walvis Ridge is supplied both by the eastward flow of this (diluted) North Atlantic Deep Water and by a general southeastward interior flow from the northern Angola Basin. Evidence suggests that this deep water continues south in the eastern Cape Basin, leaving the South Atlantic near the African continent.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0637(95)00088-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Pathways and variability of the Antarctic Intermediate Water in the western equatorial Pacific Ocean. (2005)
    Elsevier
    In:  Progress in Oceanography, 67 . pp. 245-281.
    Details
    Publication Date: 2016-10-05
    Description: In the western equatorial Pacific the low-salinity core of Antarctic Intermediate Water (AAIW) is found at about 800 m depth between potential density levels σθ = 27.2 and 27.3. The pathways of AAIW and the degradation of its core are studied, from the Bismarck Sea to the Caroline Basins and into the zonal equatorial current system. Both historical and new observational data, and results from numerical circulation model runs are used. The observations include hydrographic stations from German and Japanese research vessels, and Eulerian and Lagrangian current measurements. The model is the JAMSTEC high-resolution numerical model based on the Modular Ocean Model (MOM 2). The general agreement between results from the observations and from the model enables us to diagnose properties and to provide new information on the AAIW. The analysis confirms the paramount influence of topography on the spreading of the AAIW tongue north of New Guinea. Two cores of AAIW are found in the eastern Bismarck Sea. One core originates from Vitiaz Strait and one from St. George’s Channel, probably arriving on a cyclonic pathway. They merge in the western Bismarck Sea without much change in their total salt content, and the uniform core then increases considerably in salt content when subjected to mixing in the Caroline Basins. Hydrographic and moored current observations as well as model results show a distinct annual signal in salinity and velocity in the AAIW core off New Guinea. It appears to be related to the monsoonal change that is typically found in the near-surface waters in the region. Lagrangian data are used to investigate the structure of the deep New Guinea Coastal Undercurrent, the related cross-equatorial flow and eddy-structure, and the embedment in the zonal equatorial current system. Results from 17 neutrally buoyant RAFOS floats, ballasted to drift in the AAIW core layer, are compared with a numerical tracking experiment. In the model 73 particles are released at five-day intervals from Station J (2.5°N, 142°E), simulating currents at a moored time series station north of New Guinea. Observed and model track patterns are fairly consistent in space and season. Floats cross the equator preferably north of Cenderawasih Bay, with a maximum range in eddy-motion in this region north of New Guinea. The northward route at 135°E is also reflected in a low-salinity tongue reaching up to 3°N. At that longitude the floats seem to ignore the zonally aligned equatorial undercurrents. Farther to the east (139 145°E), however, the float observations are consistent with low-latitude bands of intermediate currents.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.pocean.2005.05.003
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  • 6
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    Walter Zenk: a distinguished ocean observer (2005)
    Elsevier
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 52 (3-4). pp. 375-381.
    Details
    Publication Date: 2020-08-05
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.dsr2.2004.12.002
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  • 7
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    Meddies and decadal changes at the Azores Front from 1980 to 2000 (2005)
    Elsevier
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 52 (3-4). pp. 583-604.
    Details
    Publication Date: 2020-08-05
    Description: Twenty years of time series observations from the deep-sea mooring KIEL276 are used to obtain information on the frequency and propagation of meddies (Mediterranean Water eddies), on long-term changes in flow properties, and on a possible relation to the North Atlantic Oscillation. The mooring was set at the nominal position 33°N, 22°W at a water depth of more than 5200 m in the northern Canary Basin. It is located near the southern boundary of the Azores Current (AC), which is part of the North Atlantic subtropical gyre, and also in the large-scale Mediterranean Water (MW) tongue originating from the Strait of Gibraltar. The amplitudes of time-varying vertical quasi-geostrophic modes and the correlation of current and temperature changes at levels in the MW and the North Atlantic Central Water above are used to identify meddies. A total of 10 meddies passed the mooring during the period 1980–2000. Half of the events can be related to earlier observations. Directional changes in meddy-related velocities are used to estimate speeds and directions of meddy propagation. Directions of propagation are very homogeneous, with all the 10 meddies observed propagating with a southward velocity component within a sector of 90°, and typical speeds are 2–3 cm/s. Meddy occurrence was uneven in time, with six meddies found during the first four years and only four meddies during the remaining 16 years. Decadal changes show the annual-mean and the fluctuating kinetic energy levels at the site changing from lower values in the 1980s to high values in the 1990s. This change appears to be correlated with variations in the North Atlantic Oscillation (NAO) index, with a delay in oceanic response of about 3 years. A conceptual model of AC meanders is used to identify meander signals in the upper-layer time series. The AC axis appears to be closer to the site during the 1990s than during the preceding decade and indicates a southward or southwestward displacement of the AC with increasingly positive values of the NAO index. Meddy frequency is lower when the AC gets closer from the north. A reduction in meddy occurrence in the region just south of the AC is possibly caused by the shear-induced blocking of some meddies crossing the front from the north.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.dsr2.2004.12.010
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