Arctic melt versus Antarctic freeze: Is Antarctica warming or not?

Photograph of a large tabular iceberg and sea ice near Antarctica

During the short austral summer, much of the sea ice surrounding Antarctica melts, often leaving only the large, tabular icebergs. Credit: NSIDC courtesy Andi Pfaffling

September 2012 was a record-setting month for both of Earth’s poles, but for different reasons: sea ice in the Arctic fell to a record low minimum extent after a summer of melting, while Antarctic sea ice froze to a record high extent during the South Pole winter. Is record Antarctic sea ice canceling out the losses in Arctic ice? And does the record in the south mean that Antarctica is not warming? Continue reading

Sea ice and the Arctic coast

eroding coast and house in shishmaref, alaska

Like many villages along the Arctic coast, the Inupiaq village of Shishmaref, Alaska, is increasingly threatened by erosion, which is aggravated by the loss of sea ice and increased temperatures that lead to permafrost thaw. Credit: Shishmaref Alaska Erosion & Relocation Coalition

Why does it matter if the Arctic sea ice melts? We often hear about the global consequences: waning sea ice is expected to lead to even more climate warming. On a more immediate and local level, the loss of summer sea ice is already affecting the land and people near the Arctic Ocean. As the ice melts to reveal the open ocean underneath, fragile coastlines become vulnerable to bigger waves and storms. Continue reading