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t011-james.html (2610B) |
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1 <p>Considerable areas of the polar oceans are covered by sea ice, |
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2 formed by frozen sea water. The extent and thickness of the ice |
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3 pack influences local and regional ecology and climate. The ice |
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4 thickness is particularly important for the ice-cover survival |
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5 during warm summers. Wind and ocean currents compress and shear the |
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6 sea ice, and can break and stack ice into ridges. Current sea ice |
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7 models assume that the ice becomes increasingly rigid as ridges of |
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8 ice rubble grow. Modeling sea ice as bonded particles, we show that |
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9 ice becomes significantly weaker right after the onset of ridge |
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10 building. We introduce a mathematical framework that allows these |
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11 physical processes to be included in large-scale models.</p> |
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12 |
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13 <p>Today a new paper of mine is published in the AGU-group journal |
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14 <a href="https://agupubs.onlinelibrary.wiley.com/journal/19422466">Journ… |
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15 of Advances in Modeling Earth Systems</a>, and it is written with |
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16 co-authors <a href="https://scholar.princeton.edu/aos_sergienko/home">Ol… |
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17 Sergienko</a> and <a |
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18 href="https://www.gfdl.noaa.gov/alistair-adcroft-homepage/">Alistair |
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19 Adcroft</a> at Princeton University (New Jersey, USA). I use my |
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20 program <a href="https://src.adamsgaard.dk/Granular.jl">Granular.jl</a> |
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21 for the simulations.</p> |
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22 |
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23 <h2>Abstract</h2> |
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24 <blockquote> |
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25 <b>The Effects of Ice Floe-Floe Interactions on Pressure Ridging in Sea … |
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26 </b> |
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27 <br><br> |
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28 The mechanical interactions between ice floes in the polar sea-ice |
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29 packs play an important role in the state and predictability of the |
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30 sea-ice cover. We use a Lagrangian-based numerical model to investigate |
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31 such floe-floe interactions. Our simulations show that elastic and |
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32 reversible deformation offers significant resistance to compression |
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33 before ice floes yield with brittle failure. Compressional strength |
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34 dramatically decreases once pressure ridges start to form, which |
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35 implies that thicker sea ice is not necessarily stronger than thinner |
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36 ice. The mechanical transition is not accounted for in most current |
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37 sea-ice models that describe ice strength by thickness alone. We |
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38 propose a parameterization that describes failure mechanics from |
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39 fracture toughness and Coulomb sliding, improving the representation |
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40 of ridge building dynamics in particle-based and continuum sea-ice |
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41 models. |
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42 </blockquote> |
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43 |
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44 <h2>Links and references:</h2> |
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45 <ul> |
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46 <li><a href="https://doi.org/10.1029/2020MS002336">Publication o… |
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47 <li><a href="https://src.adamsgaard.dk/seaice-experiments">Sourc… |
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48 <li><a href="https://src.adamsgaard.dk/Granular.jl">Simulation s… |
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49 </ul> |
