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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-4
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-4
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 02 May 2019

Model description paper | 02 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Ground subsidence effects on simulating dynamic high latitude surface inundation under permafrost thaw using CLM5

Altug Ekici1,2,3, Hanna Lee1, David M. Lawrence4, Sean C. Swenson4, and Catherine Prigent5 Altug Ekici et al.
  • 1NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
  • 2Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
  • 3Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
  • 4Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, Colorado, USA
  • 5LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, 75014, Paris, France

Abstract. Simulating surface inundation is particularly challenging for the high latitude permafrost regions. Ice-rich permafrost thaw can create expanding thermokarst lakes as well as shrinking large wetlands. Such processes can have major biogeochemical implications and feedbacks to the climate system by altering the pathways and rates of permafrost carbon release. However, the processes associated with it have not yet been properly represented in Earth system models. We show a new model parameterization that allows direct representation of surface water dynamics in CLM (Community Land Model), the land surface model of several Earth System Models. Specifically, we coupled permafrost-thaw induced ground subsidence and surface microtopography distribution to represent surface water dynamics in the high latitudes. Our results show increased surface water fractions around western Siberian plains and northeastern territories of Canada. Additionally, localized drainage events correspond well to severe ground subsidence events. Our parameterization is one of the first steps towards a process-oriented representation of surface hydrology, which is crucial to assess the biogeochemical feedbacks between land and the atmosphere under changing climate.

Altug Ekici et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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  • RC1: 'review', Anonymous Referee #1, 31 May 2019 Printer-friendly Version
  • RC2: 'review', Anonymous Referee #2, 11 Jun 2019 Printer-friendly Version
  • RC3: 'review', Anonymous Referee #3, 20 Jun 2019 Printer-friendly Version
  • RC4: 'review', Anonymous Referee #4, 25 Jun 2019 Printer-friendly Version
Altug Ekici et al.
Model code and software

clm_microsigma model code A. Ekici and H. Lee https://doi.org/10.5281/zenodo.2652181

Altug Ekici et al.
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Short summary
Ice-rich permafrost thaw can create expanding thermokarst lakes as well as shrinking large wetlands. Such processes can have major biogeochemical implications and feedbacks to climate system by altering the pathways and rates of permafrost carbon release. We developed a new model parameterization that allows direct representation of surface water dynamics with subsidence. Our results show increased surface water fractions around western Siberian plains and northeastern territories of Canada.
Ice-rich permafrost thaw can create expanding thermokarst lakes as well as shrinking large...
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