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Volume 11, issue 9 | Copyright
Geosci. Model Dev., 11, 3883-3902, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 27 Sep 2018

Development and technical paper | 27 Sep 2018

LCice 1.0 – a generalized Ice Sheet System Model coupler for LOVECLIM version 1.3: description, sensitivities, and validation with the Glacial Systems Model (GSM version D2017.aug17)

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 system model of intermediate complexity (LOVECLIM) to the Glacial Systems Model (GSM) using the LCice 1.0 coupler. The coupling scheme is flexible enough to enable asynchronous coupling between any glacial cycle ice sheet model and (with some code work) any Earth system model of intermediate complexity (EMIC). This coupling includes a number of interactions between ice sheets and climate that are often neglected: dynamic meltwater runoff routing, novel downscaling 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 is shown to have 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 (2m temperature, precipitation, jet stream, and Rossby number of jet), ocean (sea ice and Atlantic Meridional Overturning Circulation – AMOC), and Northern Hemisphere ice sheet thickness and extent. The parameter vectors are then narrowed by rejecting model runs (1700CE to present) with regional land ice volume changes beyond an acceptance range. The selected subset forms the basis for ongoing work to explore the spatial–temporal phase space of the last two glacial cycles.

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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 timescales. 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...