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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2017-277
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 02 Jan 2018

Development and technical paper | 02 Jan 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Geoscientific Model Development (GMD) and is expected to appear here in due course.

Coupling the Glacial Systems Model (GSM) to LOVECLIM: description, sensitivities, and validation

Taimaz Bahadory and Lev Tarasov Taimaz Bahadory and Lev Tarasov
  • Dept. of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John’s, NL, Canada

Abstract. We have coupled an Earth Systems Model of Intermediate Complexity (LOVECLIM) to the Glacial Systems Model (GSM). This coupling includes a number of interactions between ice sheets and climate that are often ignored: dynamic meltwater runoff routing, novel down-scaling for precipitation that corrects orographic forcing to the higher resolution ice sheet grid (advective precipitation), dynamic vertical temperature gradient, and ocean temperatures for sub-shelf melt. The sensitivity of the coupled model with respect to the selected parameterizations and coupling schemes is investigated. Each new coupling feature has a significant impact on ice sheet evolution.

An ensemble of runs is used to explore the behaviour of the coupled model over a set of 2000 parameter vectors using Present-Day (PD) initial and boundary conditions. The ensemble of coupled model runs is compared against PD reanalysis data for atmosphere (surface temperature, precipitation, jet-stream and Rossby number of jet), ocean (sea ice, sea surface temperature, and AMOC), and Northern Hemisphere ice sheet thickness and extent. The parameter vectors are then narrowed by rejecting model runs (1700 CE to present) with regional land ice volume changes beyond an acceptance range. The selected sub-set forms the basis for ongoing work to explore the spatial-temporal phase space of the last two glacial cycles.

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Taimaz Bahadory and Lev Tarasov
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Taimaz Bahadory and Lev Tarasov
Taimaz Bahadory and Lev Tarasov
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Latest update: 20 Sep 2018
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Short summary
We describe a new coupling between the Glacial Systems Model and the LOVECLIM intermediate complexity climate model. The coupling is distinguished from that of previous studies by greater completeness and accuracy, with the intent of capturing the major feedbacks between ice sheets and climate on glacial cycle time-scales. The fully coupled model will be used to examine the ice/climate phase space of past glacial cycles.
We describe a new coupling between the Glacial Systems Model and the LOVECLIM intermediate...
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