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  • 1
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    Effects of ice-front collapse and flood generation on a proglacial river channel near kangerlussuaq (Søndre Strømfjord), west greenland (1995)
    Wiley
    Details
    Publication Date: 1995-02-01
    Description: River discharge measurements downstream of the Russell Glacier, near Kangerlussuaq (Søndre Strømfjord), West Greenland revealed the occurrence of short‐term discharge fluctuations during the 1991 melt season. Frontal ice‐cliff collapse results in temporary river damming, producing initial decreases in discharge and subsequent sudden flood peaks on dam failure. Fluctuations are less than two hours in duration, with a maximum discharge fluctuation magnitude of 50m3s−1, double that of normal ablation‐controlled diurnal fluctuations. As such, these events are exceeded in magnitude only by periodic jökulhlaups resulting from the drainage of an ice‐dammed lake further up‐glacier. The concentration of discharge fluctuations at the beginning of the melt season, the large number of ice blocks within the flow and the confinement of flows between ice block levees all add to the effectiveness of these events in terms of channel erosion and sediment transport. Copyright © 1995 John Wiley & Sons, Ltd
    Print ISSN: 0885-6087
    Electronic ISSN: 1099-1085
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley
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  • 2
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    The effect of obliquity-driven changes on paleoclimate sensitivity during the late Pleistocene (2018)
    AGU (American Geophysical Union) | Wiley
    In:  Geophysical Research Letters, 45 (13). pp. 6661-6671.
    Details
    Publication Date: 2021-02-08
    Description: We reanalyze existing paleodata of global mean surface temperature ΔTg and radiative forcing ΔR of CO2 and land ice albedo for the last 800,000 years to show that a state‐dependency in paleoclimate sensitivity S, as previously suggested, is only found if ΔTg is based on reconstructions, and not when ΔTg is based on model simulations. Furthermore, during times of decreasing obliquity (periods of land‐ice sheet growth and sea level fall) the multi‐millennial component of reconstructed ΔTg diverges from CO2, while in simulations both variables vary more synchronously, suggesting that the differences during these times are due to relatively low rates of simulated land ice growth and associated cooling. To produce a reconstruction‐based extrapolation of S for the future we exclude intervals with strong ΔTg‐CO2 divergence and find that S is less state‐dependent, or even constant (state‐independent), yielding a mean equilibrium warming of 2–4 K for a doubling of CO2.
    Type: Article , PeerReviewed
    Format: text
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  • 3
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    A State-Dependent Quantification of Climate Sensitivity Based On Paleodata of the Last 2.1 Million Years (2017)
    Wiley
    In:  EPIC3Paleoceanography, Wiley, 32, pp. 1102-1114, ISSN: 08838305
    Details
    Publication Date: 2017-12-19
    Description: The evidence from both data and models indicates that specific equilibrium climate sensitivity S[X]—the global annual mean surface temperature change (ΔTg) as a response to a change in radiative forcing X (ΔR[X])—is state dependent. Such a state dependency implies that the best fit in the scatterplot of ΔTg versus ΔR[X] is not a linear regression but can be some nonlinear or even nonsmooth function. While for the conventional linear case the slope (gradient) of the regression is correctly interpreted as the specific equilibrium climate sensitivity S[X], the interpretation is not straightforward in the nonlinear case. We here explain how such a state-dependent scatterplot needs to be interpreted and provide a theoretical understanding—or generalization—how to quantify S[X] in the nonlinear case. Finally, from data covering the last 2.1 Myr we show that—due to state dependency—the specific equilibrium climate sensitivity which considers radiative forcing of CO2 and land ice sheet (LI) albedo, math formula, is larger during interglacial states than during glacial conditions by more than a factor 2.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene (2018)
    Wiley
    In:  EPIC3Geophysical Research Letters, Wiley, 45(13), pp. 6661-6671, ISSN: 00948276
    Details
    Publication Date: 2019-01-02
    Description: We reanalyze existing paleodata of global mean surface temperature ΔTg and radiative forcing ΔR of CO2 and land ice albedo for the last 800,000 years to show that a state‐dependency in paleoclimate sensitivity S, as previously suggested, is only found if ΔTg is based on reconstructions, and not when ΔTg is based on model simulations. Furthermore, during times of decreasing obliquity (periods of land ice sheet growth and sea level fall) the multimillennial component of reconstructed ΔTg diverges from CO2, while in simulations both variables vary more synchronously, suggesting that the differences during these times are due to relatively low rates of simulated land ice growth and associated cooling. To produce a reconstruction‐based extrapolation of S for the future, we exclude intervals with strong ΔTg‐CO2 divergence and find that S is less state‐dependent, or even constant state‐independent), yielding a mean equilibrium warming of 2–4 K for a doubling of CO2.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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