Author:
Arbetter T. E.,Curry J. A.,Holland M. M.,Maslanik J. A.
Abstract
There are currently a variety of one- and two-dimensional sea-ice models
being used for climate simulations and sensitivity studies. Though all the
models can be timed to simulate current-day conditions to some degree of
accuracy, the responses of each model to perturbations in forcing from the
atmosphere or ocean are different. Thus, climate-change prediction depends
on the choice of sea-ice model. In this study, the sensitivities of various
sea-ice models to external heat-flux perturbations are examined in a
systematic manner. Starting from similar baseline annual thicknesses, each
model is subjected to an applied heat-flux perturbation to assess icemelt.
Separate experiments are conducted to compare the response of each model to
heat fluxes applied at the atmospheric and the oceanic interfaces. It is
found that the magnitude of the heat-flux perturbation required to melt ice
varies greatly among different models, with the largest difference arising
between models that include ice dynamics vs those that do not. Most models
show an asymmetry in the response to heat-flux perturbations applied at the
top and bottom surfaces of the ice. This study has implications for the
choice of sea-ice models used for climate-change simulations. It also gives
insight to the accuracy required for observations and model simulations of
the surface heat fluxes.
Publisher
International Glaciological Society
Cited by
7 articles.
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