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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-39
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Model description paper
09 Mar 2017
Review status
This discussion paper has been under review for the journal Geoscientific Model Development (GMD). A final paper in GMD is not foreseen.
An Operational Thermodynamic-Dynamic Model for the Coastal Labrador Sea Ice Melt Season
Ian D. Turnbull1 and Rocky S. Taylor1,2 1C-CORE
2Memorial University of Newfoundland (MUN)
Abstract. An offshore operations thermodynamic-dynamic prediction model of sea ice break-up and drift is presented for central coastal Labrador in Atlantic Canada, and demonstrated for portions of the 2015 spring break-up of the land-fast ice. The model validation is performed using the data from ice tracking buoys deployed on the land-fast ice, which began drifting after break-up of the land-fast ice. The model uses a one-dimensional thermodynamic parameterization for ice melt and growth, includes snow accumulation and melt, and melt-pond and lead growth and contraction. The dynamic model uses a Smoothed Particle Hydrodynamics (SPH) parameterization for ice motion and changes in ice thickness and concentration. The dynamic forcing parameters include wind and ocean current drag, Coriolis deflection, internal ice stresses, and gravitational forcing due to sea surface gradients. A coastal repulsion force is employed to prevent ice particles from crossing the coastal boundaries. The model is sensitive to the prescribed initial snow depth on the sea ice. In the present work, analysis of results is focused on the offshore regions of Makkovik and Nain, Labrador. The melt of the coastal land-fast ice in these regions can be adequately simulated by the thermodynamic model alone. The model predicts the timing of the local land-fast ice break-up to within 4.6 hours to six days, and can simulate observed ice buoy drift speeds to within 1.5 meters per second.

Citation: Turnbull, I. D. and Taylor, R. S.: An Operational Thermodynamic-Dynamic Model for the Coastal Labrador Sea Ice Melt Season, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-39, 2017.
Ian D. Turnbull and Rocky S. Taylor
Ian D. Turnbull and Rocky S. Taylor
Ian D. Turnbull and Rocky S. Taylor

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Short summary
We developed a model to forecast the timing of the seasonal break-up of coastal Labrador land-fast ice in order to aid offshore operators in the region with their planning and decision-making process. The model additionally provides shorter-term (several days) ice drift forecasts for the operators. Our model can forecast the break-up of the land-fast ice at specific locations along the Labrador coast accurately to within hours to days when initialized up to a month in advance.
We developed a model to forecast the timing of the seasonal break-up of coastal Labrador...
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