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       t011-james.txt (2259B)
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            1 Considerable areas of the polar oceans are covered by sea ice,
            2 formed by frozen sea water.  The extent and thickness of the ice
            3 pack influences local and regional ecology and climate.  The ice
            4 thickness is particularly important for the ice-cover survival
            5 during warm summers.  Wind and ocean currents compress and shear
            6 the sea ice, and can break and stack ice into ridges.  Current sea
            7 ice models assume that the ice becomes increasingly rigid as ridges
            8 of ice rubble grow.  Modeling sea ice as bonded particles, we show
            9 that ice becomes significantly weaker right after the onset of ridge
           10 building.  We introduce a mathematical framework that allows these
           11 physical processes to be included in large-scale models.
           12 
           13 Today a [1]new paper of mine is published in the AGU-group journal
           14 [2]Journal of Advances in Modeling Earth Systems, and it is written
           15 with co-authors [3]Olga Sergienko and [4]Alistair Adcroft at Princeton
           16 University (New Jersey, USA).  I use my program [5]Granular.jl for
           17 the simulations.
           18 
           19 
           20 ## Abstract
           21 
           22 The Effects of Ice Floe-Floe Interactions on Pressure Ridging in Sea Ice
           23 
           24 The mechanical interactions between ice floes in the polar sea-ice
           25 packs play an important role in the state and predictability of the
           26 sea-ice cover. We use a Lagrangian-based numerical model to investigate
           27 such floe-floe interactions. Our simulations show that elastic and
           28 reversible deformation offers significant resistance to compression
           29 before ice floes yield with brittle failure. Compressional strength
           30 dramatically decreases once pressure ridges start to form, which
           31 implies that thicker sea ice is not necessarily stronger than thinner
           32 ice. The mechanical transition is not accounted for in most current
           33 sea-ice models that describe ice strength by thickness alone. We
           34 propose a parameterization that describes failure mechanics from
           35 fracture toughness and Coulomb sliding, improving the representation
           36 of ridge building dynamics in particle-based and continuum sea-ice
           37 models.
           38 
           39 
           40 References:
           41 
           42 [1] https://doi.org/10.1029/2020MS002336
           43 [2] https://agupubs.onlinelibrary.wiley.com/journal/19422466
           44 [3] https://scholar.princeton.edu/aos_sergienko/home
           45 [4] https://www.gfdl.noaa.gov/alistair-adcroft-homepage/
           46 [5] https://src.adamsgaard.dk/seaice-experiments