{"id":2234,"date":"2020-03-23T12:20:33","date_gmt":"2020-03-23T11:20:33","guid":{"rendered":"https:\/\/arctrain.de\/?p=2234"},"modified":"2020-03-23T12:20:34","modified_gmt":"2020-03-23T11:20:34","slug":"the-disappearing-sea-ice-volume","status":"publish","type":"post","link":"https:\/\/arctrain.de\/the-disappearing-sea-ice-volume\/","title":{"rendered":"The Disappearing Sea Ice Volume"},"content":{"rendered":"\n
2 years ago, Lina talked about the importance of sea ice and why studying it is essential. You can find her article here<\/a>. I would like to expand on this discussion.<\/p>\n\n\n\n Note:<\/strong> This text was published as a thread on Twitter in August 2019. I rewrote it here as a blog post, you can find the original thread here<\/a>.<\/p>\n\n\n\n Since a few weeks, I’m working on the introduction of my PhD thesis. I was making some visualization of the evolution of Arctic sea ice to illustrate the effect of Climate Change. This made me realize that we should maybe talk more about sea ice volume.<\/p>\n\n\n\n Sea ice volume is difficult to measure, as it is combining the measures of ice concentration and ice thickness. To get a reasonable estimate, we use a reanalysis. In short: The available data are assimilated into a sea ice model to bring it as close as possible to reality. The data that I use above come from the PIOMAS reanalysis<\/a>.<\/p>\n\n\n\n We often talk about sea ice extent because sea ice cover influences the climate. The sea ice insulates the atmosphere from the ocean, and the white ice reflects sunrays back to space. The maps and evolution of sea ice extent and area can be found on the NSIDC<\/a>.<\/p>\n\n\n\n Looking at these maps, like the one below, it sometimes feels like there is still a lot of ice. And that’s why I wanted to talk a bit about sea ice volume. Because sea ice volume is also important. Thinner ice will break more easily, move faster and melt faster. Old thick ice (5 years and older) has been a reservoir of negative energy, meaning that a large quantity of heat is necessary to melt it.<\/p>\n\n\n\n This old thick ice is the one melting away right now. <\/p>\n\n\n\n One would probably say that, if the sea ice area decreases, it is normal that the sea ice volume would also decrease. So let’s look at the data! I have been trying several visual ways to compare sea ice volume to the other observables, here sea ice extents and area.<\/p>\n\n\n\n<\/a>
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