Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cp-2016-66
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
27 Jun 2016
Review status
This discussion paper has been under review for the journal Climate of the Past (CP). The manuscript was not accepted for further review after discussion.
How sensitive are modeled contemporary subsea permafrost thaw and thickness of the methane clathrates stability zone in Eurasian Arctic to assumptions on Pleistocene glacial cycles?
Valentina V. Malakhova1 and Alexey V. Eliseev2,3 1Institute of Computational Mathematics and Mathematical Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, Russia
3Kazan Federal University, Kazan, Russia
Abstract. Single-point simulations with a model for thermal state of subsea sediments driven by the forcing constructed from the ice core data show that the impact of initial conditions is lost after ~ 100 kyr. The time scales of temperature propagation in sediments and respective permafrost response are ~ 10–20 kyr which is longer than the present interglacial. The timings of shelf exposure during oceanic regressions and flooding during transgressions are important for representation of sediment thermal state and hydrates stability zone (HSZ). These timings should depend on the contemporary shelf depth (SD). During glacial cycles temperature at the top of sediments is a major driver of HSZ vertical boundaries change for SD of few tens of meters, while the pressure exerted by oceanic water becomes more important for larger SD. Thus, even the existence of HSZ and its disappearance might not be easily tied to oceanic transgressions and regressions.

Citation: Malakhova, V. V. and Eliseev, A. V.: How sensitive are modeled contemporary subsea permafrost thaw and thickness of the methane clathrates stability zone in Eurasian Arctic to assumptions on Pleistocene glacial cycles?, Clim. Past Discuss., doi:10.5194/cp-2016-66, 2016.
Valentina V. Malakhova and Alexey V. Eliseev
Valentina V. Malakhova and Alexey V. Eliseev

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