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  • 1
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    OA and ripples metabolism data (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: DATE/TIME; Gross primary production/Respiration rate ratio; Gross primary production of oxygen; Identification; Net calcification rate of calcium carbonate; Net community calcification rate of calcium carbonate, dark; Net community calcification rate of calcium carbonate, light; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Respiration rate, oxygen; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 216 data points
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    DATA PANGAEA
  • 2
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    Sediment topography enhances the response of coral reef carbonate sediment dissolution to ocean acidification (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: The interaction between current flow and topography (e.g., surface ripples) in shallow, permeable coral reef carbonate sediments establishes pressure gradients that increase the rate of sediment-water solute exchange relative to fluid shear along a flat bottom. It is currently unknown how this effect from surface ripples will modify the rate at which the sediment porewater is exposed to future chemical changes in the overlying water column, such as elevated pCO2 that is causing ocean acidification (OA). To address this question, this study used a series of 22-hour incubations in flume aquaria with permeable calcium carbonate sediment communities and examined the interactive effect of pCO2 (400 and 1000 µatm) and surface topography (flat and rippled sediments) on carbonate sediment metabolism and dissolution. According to dissolved oxygen optode image analysis, the presence of surface ripples increased the oxygenated area below the sediment surface by 295% relative to flat sediments. This was reflected in the sediment-to-water column fluxes of dissolved oxygen, where rippled sediments exhibited rates of respiration (R) and gross primary production (GPP) that were ~ 45% and ~ 50% higher, respectively, than flat sediments. An increase in pCO2 shifted the sediments in the flat flumes from net calcifying (Gnet 〉 0) to net dissolving (Gnet 〈 0), an effect that was amplified an additional ~ 60% in rippled sediments. These results suggest that current estimates of coral reef carbonate sediment Gnet may be underestimating the dissolution response to OA where the carbonate sediment environment exhibits ripples in the topography.
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 3
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    OA and ripples seawater chemistry data (2020)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Oxygen; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Salinity; Temperature, water; Time point, descriptive; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 1824 data points
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    DATA PANGAEA
  • 4
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    Recent human-induced atmospheric drying across Europe unprecedented in the last 400 years (2024)
    In:  Nature Geoscience
    Details
    Publication Date: 2024-01-19
    Description: The vapor pressure deficit reflects the difference between how much moisture the atmosphere could and actually does hold, a factor that fundamentally affects evapotranspiration, ecosystem functioning, and vegetation carbon uptake. Its spatial variability and long-term trends under natural versus human-influenced climate are poorly known despite being essential for predicting future effects on natural ecosystems and human societies such as crop yield, wildfires, and health. Here we combine regionally distinct reconstructions of pre-industrial summer vapor pressure deficit variability from Europe’s largest oxygen-isotope network of tree-ring cellulose with observational records and Earth system model simulations with and without human forcing included. We demonstrate that an intensification of atmospheric drying during the recent decades across different European target regions is unprecedented in a pre-industrial context and that it is attributed to human influence with more than 98% probability. The magnitude of this trend is largest in Western and Central Europe, the Alps and Pyrenees region, and the smallest in southern Fennoscandia. In view of the extreme drought and compound events of the recent years, further atmospheric drying poses an enhanced risk to vegetation, specifically in the densely populated areas of the European temperate lowlands.
    Type: info:eu-repo/semantics/article
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    PAPER (OA)
  • 5
    Electronic Resource
    Electronic Resource
    Berechnung der Läufererwärmung von Turbogeneratoren mittels der Methode der äquivalenten Wärmequellennetze (1957)
    Springer
    Electrical engineering 43 (1957), S. 133-140 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Zusammenfassung Aus dem angeführten Beispiel ist ersichtlich, daß trotz äußerst einfachen Formeln, die sich aus der Benutzung der Methode der äquivalenten Wärmequellennetzes ergeben, ein Ergebnis erhalten wird, daß dem mittels eindimensionaler Wärmeströmung errechnetem, gleichwertig ist. Dabei ist der gesamte Rechenaufwand bedeutend geringer und einfacher1. Die Resultate sind sehr instruktiv und durchsichtig, denn das Wärmequellennetz-Schema gibt ein gutes Bild der thermischen Verhältnisse und der thermischen Belastung des Läufers. So ist z. B. ohne weiteres zu ersehen, in welchem Verhältnis der Einfluß der einzelnen Größen d L ,ϑ 2 undϑ 3 usf. auf die Wärmeabfuhr ist, oder daß z. B. bei relativ geringer Verbesserung des Wärmeüberganges im Ventilationsspalt, der Temperaturanstieg bei verringerter Nutzahl bedeutend geringer sein wird, usf. Es sei allerdings bemerkt, daß natürlich die richtige Zusammenstellung des Netzschemas und die richtigen Formeln zur Wertbestimmung der Widerstände äußerst wichtig sind2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01479339
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    Paper (German National Licenses)
    Fulltext
  • 6
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    Berechnung der L�ufererw�rmung von Turbogeneratoren mittels der Methode der �quivalenten W�rmequellennetze (1957)
    Springer
    Details
    Publication Date: 1957-02-01
    Print ISSN: 0948-7921
    Electronic ISSN: 1432-0487
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Springer
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    PAPER CURRENT
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