An animation of satellite images from earlier this year reveals the dramatic break up of an expanse of Antarcticseaice that had been held fast to the shoreline of the Antarctic Peninsula for 11 years.
, like the burlier ice sheet before it, managed to slow the march of glaciers into the sea — albeit less effectively. With the sea ice gone now too, “the likelihood is that backstress will be reduced on all glaciers in the Larsen B Embayment, and that additional inland ice losses will be coming soon,” says NASA glacier expert Christopher Shuman.
In fact, just a day before the breakup began in earnest, satellite imagery revealed ominous signs: ponds of meltwater pockmarking the sea ice surface, and fractures beginning to splinter it.By the next day, very warm, moist air had converged on the Antarctic Peninsula.
Areas of red in this map, generated by a polar-specialized weather forecast model, reveal areas where the atmosphere was transporting large amounts of water vapor in the Southern Hemisphere on January 20, 2022. The atmospheric river that impacted the Antarctic Peninsula shortly before a large sheet of sea ice collapsed there is seen on the right-hand side of the map.
After reaching the top, the air starts avalanching down the lee side of the mountains. As it races to lower elevations, it compresses and thus warms up. Because it has had the moisture combed out, it warms even more than it otherwise would. And to make things worse, the loss of clouds on the leeward side of the mountains can lead to sunnier conditions, heating things up even more, Datta says.
"One such extreme foehn-induced melt event occurred in the winter of 2016, producing strong melt over the Larsen C ice shelf," Datta says. Climate warming could have yet another influence as well — on the atmospheric circulation that promotes foehn winds.
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