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    Marine sequestration of carbon in bacterial metabolites (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-04-02
    Description: Article The microbial carbon pump is an important pathway for marine carbon sequestration, yet the chemical complexity and stability of persistent molecules remain enigmatic. Here, the authors use bioassay experiments to investigate the complexity and refractory nature of bacterial dissolved organic matter. Nature Communications doi: 10.1038/ncomms7711 Authors: Oliver J. Lechtenfeld, Norbert Hertkorn, Yuan Shen, Matthias Witt, Ronald Benner
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
    Electronic Resource
    Electronic Resource
    BEHAVIORAL EVIDENCE FOR HEARING THROUGH THE LOWER JAW BY AN ECHOLOCATING DOLPHIN (TURSIOPS TRUNCATUS) (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 4 (1988), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: On the basis of disputed physiological evidence the fat-filled lower jaw of odontocete cetaceans has previously been hypothesized as the primary pathway to the inner ear for acoustic signals. To gain behavioral evidence, a dolphin was trained to perform an echolocation task while wearing suction cups over its eyes and either of two neoprene robber hoods over its lower jaw. One hood allowed returning acoustic signals to pass. The other substantially attenuated such signals. The dolphin's performance was significantly hindered while wearing the attenuating hood (P 〈. 001, ψ2) as would be expected if the lower jaw was critically important in the reception of high frequency signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1988.tb00203.x
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    Paper (German National Licenses)
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  • 3
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    The impact of the permafrost carbon feedback on global climate (2014)
    In:  EPIC3Environmental Research Letters
    Details
    Publication Date: 2016-12-13
    Description: Degrading permafrost can alter ecosystems, damage infrastructure, and release enough carbon dioxide (CO2) and methane (CH4) to influence global climate. The permafrost carbon feedback (PCF) is the amplification of surface warming due to CO2 and CH4 emissions from thawing permafrost. An analysis of available estimates PCF strength and timing indicate 120 ± 85 Gt of carbon emissions from thawing permafrost by 2100. This is equivalent to 5.7 ± 4.0% of total anthropogenic emissions for the Intergovernmental Panel on Climate Change (IPCC) representative concentration pathway (RCP) 8.5 scenario and would increase global temperatures by 0.29 ± 0.21 °C or 7.8 ± 5.7%. For RCP4.5, the scenario closest to the 2 °C warming target for the climate change treaty, the range of cumulative emissions in 2100 from thawing permafrost decreases to between 27 and 100 Gt C with temperature increases between 0.05 and 0.15 °C, but the relative fraction of permafrost to total emissions increases to between 3% and 11%. Any substantial warming results in a committed, long-term carbon release from thawing permafrost with 60% of emissions occurring after 2100, indicating that not accounting for permafrost emissions risks overshooting the 2 °C warming target. Climate projections in the IPCC Fifth Assessment Report (AR5), and any emissions targets based on those projections, do not adequately account for emissions from thawing permafrost and the effects of the PCF on global climate. We recommend the IPCC commission a special assessment focusing on the PCF and its impact on global climate to supplement the AR5 in support of treaty negotiation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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