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larswd committed May 15, 2024
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Expand Up @@ -236,34 +236,20 @@ <h1 class="site-logo" id="site-title">Lars Willas Dreyer</h1>

<h1>Direct in-situ observations of wave-induced floe collisions in the deeper Marginal Ice Zone <a class="headerlink" href="#Codes" title="Permalink to this headline"></a></h1>

<p>The arctic and antarctic ice sheets are an important regulator of the global climate. For example, the
<p>The Arctic and Antarctic ice sheets are an important regulator of the global climate. For example, the
high albedo of the ice reflects sunlight, slowing global warming. However, these ice sheets are melting,
and the speed at which they melt is in part affected by the size of each individual ice floe.
The smaller the floe, the higher the ratio of surface area (which melts in contact with water)
and volume. </p>

<p>In this article, which can be found at <a href="https://arxiv.org/abs/2404.02750">https://arxiv.org/abs/2404.02750</a>
we provide evidence suggesting that collisions between ice floes in the arctic occur under normal weather conditions. The data
presented was recovered from a small sensor buoy which was placed on a small ice floe
deep within the Marginal Ice Zone, the zone surrounding the poles where the sea ice
typically covers between 15 % and 80% of the ocean surface. </p>
<figure>
<img src="figures/MIZ_collisions_history.png">
<figcaption>The journey undertaken by the sensor buoy. The blue to
green colourbar show the average sea ice concentraion in the area.
</figcaption>
</figure>
<p> The sensor buoy contained an accelerometer, which measured the forces acting
on the ice floe. In the recovered data, we discovered clear signs of floe-floe collisions.
The existence of these collisions are important, as they take energy out of the incoming wave field.
This results in a slower break up of the sea ice, and the inclusion of floe-floe
collisions in arctic ocean models will hopefully improve their accuracy.
and the melting is accelerated by sea ice breaking. </p>

<p>We have, in our new article (see <a href="https://arxiv.org/abs/2404.02750">https://arxiv.org/abs/2404.02750</a>)
found evidence suggesting that collisions between ice floes in the Marginal Ice Zone (Sea Ice concentration between 15%-80%) occur under normal weather conditions.
The existence of these collisions is important, as they take energy out of the incoming wave field,
and accurate modelling of collisions in Arctic ocean models will hopefully yield
better weather forecast models in the Arctic.
</p>
<figure>
<img src="figures/MIZ_collisions.png">
<figcaption>Example of how collisions in acceleration data looks.
The top two time series have clear collision signs, with clusters of extreme
events (red dots).
<img src="figures/MIZ_collisions_history.png">
<figcaption>The deployed sensor travelled from the Yermak plateau north of Svalbard
down to northern Iceland. The orange star show the spot where the drifter stopped working.
</figcaption>
</figure>
</div>
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