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  • 1
    Keywords: Marine Sciences ; Environmental management ; Atmospheric Sciences ; Marine & Freshwater Sciences ; Environmental Management
    Description / Table of Contents: Introduction to the Assessment --- Past and Current Climate Change --- Past and Current Changes in the North Sea (and interface regions) --- Climate Change Projections --- Impacts of Current and Future Climate Change in Ecosystems --- Climate Impacts on Socio-economy
    Pages: Online-Ressource (XLV, 528 pages) , 277 illustrations, 215 illustrations in color
    ISBN: 9783319397450
    Language: English
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  • 2
    Keywords: Marine Sciences ; Environmental management ; Atmospheric Sciences ; Marine & Freshwater Sciences ; Environmental Management
    Description / Table of Contents: Introduction to the Assessment --- Past and Current Climate Change --- Past and Current Changes in the North Sea (and interface regions) --- Climate Change Projections --- Impacts of Current and Future Climate Change in Ecosystems --- Climate Impacts on Socio-economy
    Pages: Online-Ressource (XLV, 528 pages) , 277 illustrations, 215 illustrations in color
    ISBN: 9783319397450
    Language: English
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  • 3
    ISSN: 1432-1009
    Keywords: KEY WORDS: Monitoring; Sampling; North Sea; Ferry; Fluorescence; Salinity; Temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 4
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    ICES
    In:  [Paper] In: ICES Annual Science Conference, 22.-26.09.2008, Halifax, Canada .
    Publication Date: 2017-01-06
    Description: A considerable amount of primary production by marine phytoplankton is released to seawater as dissolved organic matter (DOM) via exudation and leakage processes. The labile fraction of DOM can either directly serve as a source of energy and nutrients or is transformed to particulate matter by abiotic gel particle formation. Principally, both pathways induce diverse effects on higher trophic levels, as they: (i) affect the growth of bacteria and photo-autotrophic nanoplankton, which directly affects the microbial foodweb, and (ii) enhance the formation of aggregates, which provide pelagic microhabitats but also accelerate the export of organic matter to the benthos. Reliable biogeochemical flux estimates of these distinct pathways will crucially depend on our understanding of small-scale processes. Here, we show examples that address the microbial turnover of organic matter and how it is related to primary and secondary production in the North Atlantic and at sites in shelf regions. Recent findings on the sensitivity of microbial processes to changes in temperature and pH will be incorporated. Ecosystems in coastal and shelf regions are most sensitive to anthropogenic impacts, as they are susceptible not only to global changes but also to regional changes. We will therefore give an outlook on how to improve monitoring, experimental, and modelling strategies to better account for microbial foodweb dynamics when assessing climate change effects on ecosystems in coastal and shelf regions.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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  • 5
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A mathematical simulation model was used to ascertain the relation between the diffusion of oxygen and inorganic carbon into layers of marine microphytes and the carbon metabolism of these microphytes. The simulation model included physiological and physico-chemical parameters and was validated using the few data available from the literature on production determinations, on oxygen and pH values, and on growth dynamics of natural populations. The model was tested with various modifications to mimic experiments with suspended algae and algal films on inert substrates, and also to simulate microphytobenthos in sediment cores with or without grazing. The simulated variations in oxygen concentrations and pH values over time scales of min and days were consistent with field and experimental observations. The model predicted upper limits of primary production and biomass observed in well developed natural populations; these limits are caused by a combination of oxygen accumulation and depletion of inorganic carbon resulting from diffusion limitations and the recirculation of organic carbon in photosynthetic, respiratory and excretory processes. The model calculations were used to check on the adequacy of the various methods used to determine the primary production of benthic microphytes.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Aquatic ecology 11 (1977), S. 16-17 
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Primary production measurements of benthic micro-algal vegetations were carried out with samples from six permanent plots. These permanent plots were assumed to cover the range of salinities and sediments in the estuary. A modification of the standard14C-procedure (COLIJN and VAN BUURT, 1975) was used throught this study. The sensitivity and reliability of the modified method, based on combustion of the filtered sediments and subsequent scintillation counting, is discussed. The method proves to be a fast one, and reliable with recoveries over 95%. Moreover, counting efficiences can be based on one quench curve only for all sediment samples. The method is also applicable for planktic primary production. To make a direct comparison of the six permanent plot possible, the potential primary production was measured under saturating light intensities. The incubation temperature corresponded with the temperature during sampling. The results show a spring peak in both production and chlorophyll-a values on all permanent plots. Daily fixation rates were calculated, using daylength and tidal emersion data. No corrections for respiration during the dark period have been made. Production over 1975 was calculated, using 7 to 12 measurements per permanent plot. The results are given in Table I, which also shows the relative sediment composition and exposure time for the six permanent plots. The sediment composition is given as the mean extinction at 430 nm of a partly settled sediment suspension (SCHRÖDER, 1976). Partial correlation coefficients of primary production with five variables (station, level, chlorophyll-a, salinity and temperature) were computed. Only chlorophyll-a showed a positive significant correlation coefficient (r=0.683; n=53). In contrast to the results of CADÉE and HEGEMAN (1974) in the western Wadden Sea no correlation could be found between primary production and temperature. The absence of a spring peak in the western part of the Wadden Sea is another striking difference with our results, for which no explanation can be given. More measurements are needed over a longer period to model the benthic production of micro-algal vegetations. Such a model is needed to predict the primary production under changing environmental conditions.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2019-05-17
    Description: The Coastal Observing System for Northern and Arctic Seas (COSYNA) was established in order to better understand the complex interdisciplinary processes of northern seas and the Arctic coasts in a changing environment. Particular focus is given to the German Bight in the North Sea as a prime example of a heavily used coastal area, and Svalbard as an example of an Arctic coast that is under strong pressure due to global change. The COSYNA automated observing and modelling system is designed to monitor real-time conditions and provide short-term forecasts, data, and data products to help assess the impact of anthropogenically induced change. Observations are carried out by combining satellite and radar remote sensing with various in situ platforms. Novel sensors, instruments, and algorithms are developed to further improve the understanding of the interdisciplinary interactions between physics, biogeochemistry, and the ecology of coastal seas. New modelling and data assimilation techniques are used to integrate observations and models in a quasi-operational system providing descriptions and forecasts of key hydrographic variables. Data and data products are publicly available free of charge and in real time. They are used by multiple interest groups in science, agencies, politics, industry, and the public.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 8
    Publication Date: 2019-09-24
    Type: Book , NonPeerReviewed
    Format: text
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  • 9
    Publication Date: 2019-09-23
    Type: Book , NonPeerReviewed
    Format: text
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  • 10
    Publication Date: 1997-09-01
    Description: Like other commercial fluorometers the 1-Hz fluorometer is a device that can measure chlorophyll-α concentrations even in highly diluted phytoplankton suspensions. In contrast to those fluorometers, it measures rates of photosynthetic activity in relation to the total amount of detectable fluorescent material. Applications include the determination of total algal pigment concentrations as well as algal productivity. In this work the primary production was detected by fluorescence yield measurements at different irradiances. Fluorometrically analysed rates were correlated with the carbon fixation rate measured by14C incubation. Fluorescence data were sampled in parallel experiments by the PAM (pulse amplitude modulated)-and 1-Hz fluorometer. The results of the14C incubation method were highly correlated with the calculated 1-Hz — and PAM fluorometer data. The applications presented show that it is possible with both fluorometers to measure the impact of environmental changes on the production of phytoplankton communities in vivo.ZusammenfassungÄhnlich anderen kommerziellen Fluorometern ist das 1Hz-Fluorometer ein MegerÄt, das Chlorophyll-a Konzentrationen selbst in hochverdünnten Phytoplankton-Lösungen messen kann. Im Gegensatz zu diesen ist es in der Lage, den photosynthetisch aktiven Anteil im VerhÄltnis zur Gesamt-Chlorophyll-a Fluoreszenz festzustellen. Anwendungen dieses GerÄtes schliessen die Bestimmung des gesamten Algenpigmentgehaltes sowie die Messung der AlgenproduktivitÄt ein. Die PrimÄrproduktionsrate wurde über den Fluoreszenzyield bei unterschiedlichen LichtintensitÄten bestimmt. Sie wurde mit der Kohlenstoffaufnahme der Algen, gemessen über die14C Assimilation, korreliert. Die Messungen wurden in Parallelexperimenten mit dem PAM (Pulse Amplitude Modulated)- und 1Hz-Fluorometer durchgeführt. Die Ergebnisse zeigen eine sehr gute Korrelation der14C Daten mit den berechneten 1Hz-Fluorometer- und PAM Fluorometer-Werten. Die hier gegebenen Anwendungen zeigen die Möglichkeit, mit beiden Fluorometern den Einfluss von UmweltÄnderungen auf Phytoplankton-Gemeinschaften in vivo messen zu können. ©1997 Springer-Verlag
    Print ISSN: 1616-7341
    Electronic ISSN: 1616-7228
    Topics: Geosciences , Physics
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