A reconstruction of sea ice reveals the lowest levels in 800 years, according to new research published in the journal Climate Dynamics.
Researchers modeled sea ice levels between Greenland and Svalbard, an archipelago in the Arctic Ocean north of Europe, from the 13th century to present using data from a natural climate "archive" and from historic human records.
"We have combined information about the climate found in ice cores from an ice cap on Svalbard and from the annual growth rings of trees in Finland and this gave us a curve of the past climate," Aslak Grinsted said in a press release. Grinsted is a geophysicist with the Centre for Ice and Climate at the Niels Bohr Institute at the University of Copenhagen in Denmark. "We see that the sea ice is shrinking to a level which has not been seen in more than 800 years."