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  • 1
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    Fahrtleiterbericht der 15. Reise FS Poseidon [POS15], (18.5.-26.5.1977) (1977)
    Institut für Meereskunde
    In:  Institut für Meereskunde, Kiel, 7 pp.
    Details
    Publication Date: 2015-03-23
    Type: Report , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Report - Cruise Report
  • 2
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    Trends für eintragsrelevante Faktoren und für die Nährsalzkonzentrationen im Wasser der Kieler Bucht : ein Beitrag zur Erforschung d. Eutrophierung der Nord- und Ostsee (1985)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 148 . Institut für Meereskunde, Kiel, Germany, 45 pp.
    Details
    Publication Date: 2013-07-24
    Type: Report , NonPeerReviewed
    Format: text
    DOI: 10.3289/ifm_ber_148
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    OceanRep: Report - other report
  • 3
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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
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 4
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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
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 5
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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
  • 6
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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
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 7
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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
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 8
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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
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 9
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    Basin-wide particulate carbon flux in the Atlantic Ocean: regional export patterns and potential for atmospheric CO2 sequestration (2001)
    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 15 (4). pp. 845-862.
    Details
    Publication Date: 2018-03-15
    Description: Particle flux data from 27 sites in the Atlantic Ocean have been compiled in order to determine regional variations in the strength and efficiency of the biological pump and to quantify carbon fluxes over the ocean basin, thus estimating the potential oceanic sequestration of atmospheric CO2. An algorithm is derived relating annual particulate organic carbon (POC) flux to primary production and depth that yields variations in the export ratio (ER = POC flux/primary production) at 125 m of between 0.08 and 0.38 over the range of production from 50 to 400 g C m−2 yr−1. Significant regional differences in changes of the export ratio with depth are related to the temporal stability of flux. Sites with more pulsed export have higher export ratios at 125 m but show more rapid decreases of POC flux with depth, resulting in little geographic variation in fluxes below ∼3000 m. The opposing effects of organic carbon production and calcification on ΔpCO2 of surface seawater are considered to calculate an “effective carbon flux” at the depth of the euphotic zone and at the base of the winter mixed layer. POC flux at the base of the euphotic zone integrated over the Atlantic Ocean between 65°N and 65°S amounts to 3.14 Gt C yr−1. Of this, 5.7% is remineralized above the winter mixed layer and thus does not contribute to CO2 sequestration on climatically relevant timescales. The effective carbon flux, termed Jeff, amounts to 2.47 Gt C yr−1 and is a measure of the potential sequestration of atmospheric CO2 for the area considered. A shift in the composition of sedimenting particles (seen in a decrease of the opal:carbonate ratio) is seen across the entire North Atlantic, indicating a basin-wide phenomenon that may be related to large-scale changes in climatic forcing.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2000GB001376
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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