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Sea ice really does have quite a few impacts, both on the rest of the climate system and also on [----1----].

You're listening to Claire Parkinson, project scientist for NASA's Aqua satellite mission. Among other things, this mission measures [----2----] sea ice at Earth's poles.

Sea ice is ice that forms off in the freezing of seawater. It's a very common feature in the polar regions. Sea ice is really quite an effective [----3----] between the ocean and the atmosphere. And also it's white, and being white means that the solar [----4----] that comes down and strikes it largely gets reflected away and goes back to space.

[----5----] where the heat can't escape as quickly to the atmosphere. Dr. Parkinson spoke of the loss of sea ice cover in the Arctic.

We can see a clear long-term trend, which is a trend toward lesser sea ice coverage. And it turns out that it's overall about 3 to 4% per decade reduced sea ice coverage since the late 1970s.

That means that, every year since the 1970s, we've lost an area of Arctic sea ice about the size of Switzerland. Many scientists now suggest we'll see an ice-free Arctic in the summertime in this century – although some ice will still return each winter.
ecosystems floating insulator radiation Sea ice helps cool our planet by reflecting sunlight back to space and also by trapping heat in the ocean,
[擴(kuò)展閱讀-Featured Scientist] Claire Parkinson NASA climate scientist Claire Parkinson uses satellite data to study changes in polar sea ice and their connection to broader climate change. Dr. Parkinson is project scientist for the Aqua satellite mission, which is collecting data about the Earth’s atmosphere, oceans, land, ice, and vegetation. She has also developed a computer model of sea ice, done fieldwork in both the Arctic and Antarctic, and is the lead author of several books and a co-author of others, as well as having published approximately 100 refereed science articles.