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  • 11
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    The nose: a characteristic inversion within the salinity maximum water in the tropical northeast Atlantic (1993)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 40 (1-2). pp. 537-557.
    Details
    Publication Date: 2020-08-05
    Description: During leg 1 of Meteor cruise 10 in March/April 1989 at 18 circ N, 30 circ W, the high spatial and temporal resolution of hydrographic CTD-stations indicated that the study site was in a hydrographically complex region in the transition zone between the Canary Current and the North Equatorial Current at the southern boundary of the subtropical gyre. Strong variability was found within the upper 120 m due to interleavings of warmer and saltier subtropical salinity maximum water with colder and less saline upper thermocline water. The interleavings caused unexpected nose-like temperature, salinity, nitrate and oxygen profiles yet not described in the literature. A second variability source was found in the Central Water area, because the study area was situated in the vicinity of the Central Water Boundary dividing North and South Atlantic Central Water. Hydrographic analysis of the study shows that interpretations of biological and chemical data can only be done in conjunction with high resolution CTD-profiling
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0645(93)90031-H
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 12
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    An unexpected nitrate distribution in the tropical North Atlantic at 18°N, 30°W—implications for new production (1993)
    Elsevier
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 40 (1-2). pp. 521-536.
    Details
    Publication Date: 2019-01-21
    Description: During a R.V. Meteor JGOFS-NABE cruise to a tropical site in the northeast Atlantic in spring 1989, three different vertical regimes with respect to nitrate distribution and availability within the euphotic zone were observed. Besides dramatic variations in the depth of the nitracline, a previously undescribed nose-like nitrate maximum within the euphotic zone was the most prominent feature during this study. Both the vertical structure of phytoplankton biomass and the degree of absolute and relative new production were related to the depth of the nitracline, which in turn was dependent on the occurrence/non-occurrence of the subsurface subtropical salinity maximum (S(max)). The mesoscale variability of the nitracline depth, as indicated from a pre-survey grid, and published data on the frequent occurrence of the S(max) in tropical waters suggest higher variability of new production and F-ratio than usually expected for oligotrophic oceans. The importance of salt fingering and double diffusion for nitrate transport into the euphotic zone is discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0645(93)90030-Q
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 13
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    Fahrtbericht über die Reise 100/a der "Poseidon" [POS100/a] in die Gewässer westlich der Lofoten (1983)
    In:  UNSPECIFIED, Kiel, Germany, 5 pp.
    Details
    Publication Date: 2019-06-21
    Description: Die Reise 100 der "Poseidon" wurde durchgeführt im Rahmen der von der Deutschen Forschungsgemeinschaft geförderten Pilotstudie zur möglichen Errichtung eines neuen Sonderforschungsbereiches an der Universität Kiel mit dem Thema "Sedimentation in borealen Meeren". Ziel der Pilotstudie ist es, die Grundlagen für ein interdisziplinäres Projekt vorzubereiten, das die komplexen Zusammenhänge zwischen physikalischer Umwelt, biologischer Produktion, Sedimentation aus dem pelagischen System und die Abbildung pelagischer Prozesse im und auf dem Meeresboden in der Norwegischen See erforschen soll. Ziel der Reise 100a der "Poseidon" war es, in ausgewählten "Stationsboxen" von 1ox1o sm Kantenlänge die Sedimentation von Phytoplankton nach einer Blüte zu messen, und die Wassermassenverteilung in Zeitskalen von Tagen in einer in Stromrichtung nach Norden ausgerichteten "Box" zu beschreiben.
    Type: Report , NonPeerReviewed
    Format: text
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    OceanRep: Report - Cruise Report
  • 14
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    Seawater sediment interactions in coastal waters: an interdisciplinary approach (1987)
    Springer
    In:  Lecture notes on coastal and estuarine studies, 13 . Springer, Berlin, Germany, 338 pp. ISBN 3-540-17571-7
    Details
    Publication Date: 2013-12-10
    Type: Book , NonPeerReviewed
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    OceanRep: Book
  • 15
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    The effect of sediment flushing by density displacement of interstitial water on pelagic primary production and microbial activity (1976)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-18
    Description: Nutrient and oxygen levels and ratios, primary production and data on bacterial activity recorded during an enclosure experiment carried out in July/August 1974 in Kiel Bight are presented and discussed. Considerable amounts of nutrients were released from the sediments due to density displacement of interstitial water and this was found to have a direct effect on phytoplankton production. Ammonia levels outside the enclosure were low and, in contrast to other nutrients and oxygen which were highly correlated with each other, ammonia showed no correlation with any other parameter. Presumably, ammonia released from the sediments escaped detection due to rapid uptake by phytoplankton. Reactive nitrogen, specifically ammonia thus seemed to be the limiting factor for primary production during the experiment. Sediment flushing also led to increased bacterial numbers and activity in the water column, however, this effect could only be measured inside the enclosure. These aspects of sediment/water interaction and their effect on the dynamics of shallow coastal ecosystems are discussed.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 16
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    Growth and sedimentation of the phytoplankton spring bloom in the Borholm Sea (Baltic Sea) (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-23
    Description: Results obtained from short-term (8 h to 24 h intervals) measurements of physical, chemical and biological properties of the 70 m water column from an anchor station in the Bornholm Sea over a 10-day period are presented and discussed. Phytoplankton biomass concentration and production rates indicated that the spring bloom was in progress in this period. The onset of the spring bloom occurred prior to the advent of thermal stratification. Peak growth rates, accompanied by nutrient depletion and biomass accumulation in surface layers, were concomitant with calm weather and a cloudless sky after which a part of the population was observed to sink out of the water column unimpeded by the permanent halocline. Maximum sinking rates of the dominant species, Skeletonema costatum, ranged between 30 to 50 m per day during this event. The development of the spring bloom apparently takes place in a series of events during which periods of low production alternate with periods of high production and rapid sedimentation of parts of the population.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 17
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    Planktologische Beobachtungen auf einem Schnitt durch die Nordsee von Cuxhaven nach Edinburgh (1967)
    Institut für Meereskunde
    Details
    Publication Date: 2022-04-22
    Description: Im August 1966 wurden zwischen Cuxhaven und Edinburgh 39 Oberflachenproben in 10 sm Abstand und 17 Tiefenproben auf 5 Vertikalstationen entnommen. Es wurden die Verteilung von Temperatur, Salzgehalt, Trübung, Gelbstoff-, Chlorophyll a- und Eiweißgehalt und die Artenzusammensetzung des größeren Phytoplanktons untersucht. Folgende Wassermassen wurden beobachtet: 1. Das Wasser der Deutschen Bucht mit hohen Werten für die Trübung, den Gelbstoff-, Chlorophyll- und Eiweißgehalt. Das Phytoplankton ist durch den Reichtum an Diatomeen mit der vorherrschenden Art Rhizosolenia imbricata var. shrubsolei gekennzeichnet. 2. Das salzreiche Doggerbankwasser atlantischer Herkunft, das sehr niedrige Werte für die untersuchten biologischen Faktoren aufweist. Neben den Diatomeen werden Dinoflagellaten häufig. 3. Das Britannische Ostktüstenwasser mit einem leicht erhöhten Gelbstoffgehalt aber sonst ebenfalls sehr niedrigen Werten für Trübung, Chlorophyll a und Eiweiß. Die Kieselalgen sind von Peridineen abgelöst worden. Die Leitform ist Ceratium furca. Der Küsteneinfluß ist an der schottischen Küste sehr viel geringer als in der Deutschen Bucht. Die niedrigen Chlorophyll- und Eiweißwerte in der offenen Nordsee kennzeichnen das sommerliche Minimum in der Planktonentwicklung.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 18
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    Zur Sedimentation von Seston, eine produktionsbiologische Untersuchung (1965)
    Institut für Meereskunde
    Details
    Publication Date: 2022-04-19
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 19
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    Zur Bestimmung des Extinktionskoeffizienten für Chlorophyll a in Methanol (1968)
    Institut für Meereskunde
    Details
    Publication Date: 2022-04-26
    Description: Anhand von zwei käuflichen Präparaten wird die Extinktion von Chlorophyll a in verschiedenen Lösungsmitteln untersucht und daraus der Extinktionskoeffizient für frisch extrahiertes, ungetrocknetes Chlorophyll a in Methanol abgeleitet. Er beträgt für das rote Extinktionsmaximum bei 665 nm 75.0 l/g cm. Die Extinktionskoeffizienten von getrocknetem Chlorophyll a sind in den untersuchten Lösungsmitteln 10-25% niedriger als die von einer frisch extrahierten Chlorophyllösung (Tabelle 2). Die Messung des Chlorophyll a-Gehaltes kann mit hinreichender Genauigkeit in einem Filterphotometer (ELKO II, Zeiss) ausgeführt werden. Hierzu werden Eichkurven für drei verschiedene Interferenzfilter angegeben. From two purchasable preparations of crystalline chlorophyll a, the extinction coefficient of undried chlorophyll a in methanol has been calculated as 75.0 l/g cm at the maximum of extinction at 665 nm. The extinction coefficients of dried chlorophyll a in the different solvents tested are 10-25% lower than those of undried chlorophyll a (table 2). Chlorophyll a can be measured in a filter photometer (ELKO II, Zeiss) with sufficient precision. Standard curves for three different interference filters are given.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 20
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    Der Kranzwasserschöpfer, ein neuentwickeltes Gerät zur gezielten Probennahme (1968)
    Institut für Meereskunde
    Details
    Publication Date: 2022-04-25
    Description: Es wird ein Geräit beschrieben, mit dem man sechs 5-Liter-Wasserproben aus beliebigen Wassertiefen entnehmen kann. Die Schöpfer werden elektromagnetisch geschlossen. Durch Zusatzgeräte lassen sich verschiedene Parameter kontinuierlich registrieren (z. B. t° C, S ‰, Tiefe, Oberlicht, Lichtextinktion). Dies ermöglicht je nach Fragestellung eine gezielte Probennahme. An apparatus is described which makes it possible to obtain six 5-liter walersamples from arbitrary depths. The waterbottles are closed electromagnetically. By means of accessory apparatus various parameters can be registered continuously (e.g. t°, S ‰, depth, downward light, lightextinction). This will make it possible to take samples at representative depths, which are most relevant to the problem under investigation.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
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