All polar bears across the Arctic face shorter sea ice season
It's no secret that Arctic sea ice is melting. Polar bears, the poster-child for climate change, are among the animals most affected by the seasonal and year-to-year changes in Arctic sea ice, because they rely on this surface for essential activities such as hunting, traveling and breeding.
|A polar bear tests the strength of thin sea ice [Credit: Mario Hoppmann/imaggeo.egu.eu]|
"This study shows declining sea ice for all subpopulations of polar bears," said co-author Harry Stern, a researcher with the UW's Polar Science Center. "We have used the same metric across all of the polar bear subpopulations in the Arctic so we can compare and contrast, for example, the Hudson Bay region with the Baffin Bay region using the same metric."
The analysis shows that the critical timing of the sea ice break-up and sea ice freeze-up is changing in all areas in a direction that is harmful for polar bears.
|Three adult polar bears travel across sea ice in southeast Greenland [Credit: Kristin Laidre/University of Washington]|
"Sea ice really is their platform for life," said co-author Kristin Laidre, a researcher at the UW's Polar Science Center. "They are capable of existing on land for part of the year, but the sea ice is where they obtain their main prey."
The new study draws upon 35 years of satellite data showing sea ice concentration each day in the Arctic. NASA scientists process the data, stored at the National Snow and Ice Data Center in Boulder, Colorado. The center also reports each fall the yearly minimum low for Arctic sea ice. This August saw the fourth lowest in the satellite record.
Across all 19 polar bear populations, the researchers found that the total number of ice-covered days declined at the rate of seven to 19 days per decade between 1979 and 2014. Sea ice concentration during the summer months -- an important measure because summertime is when some subpopulations are forced to fast on land -- also declined in all regions, by 1 percent to 9 percent per decade.
The most striking result, researchers said, is the consistent trend across all polar bear regions for an earlier spring ice melt and a later fall freeze-up. Arctic sea ice retreats in the springtime as daylight reappears and temperatures warm. In the fall months the ice sheets build again as temperatures drop.
"These spring and fall transitions bound the period when there is good ice habitat available for bears to feed," Laidre said. "Those periods are also tied to the breeding season when bears find mates, and when females come out of their maternity dens with very small cubs and haven't eaten for months."
|An image of Arctic sea ice taken during an airborne survey of polar ice in July 2016 [Credit: NASA]|
"We expect that if the trends continue, compared with today, polar bears will experience another six to seven weeks of ice-free periods by mid-century," Stern said. The trend appears to be linear and isn't accelerating or leveling off, Stern added. The researchers recommend that the National Climate Assessment incorporate the timing of spring ice retreat and fall ice advance as measures of climate change in future reports.
The study's results currently are used by the International Union for Conservation of Nature's polar bear specialist group, which completes assessments of polar bears and issues the species' conservation status. The researchers plan to update their findings each year as new ice coverage data are available.
"It's nice to see this work being used in high-level conservation goals," Laidre said.
Author: Michelle Ma | Source: University of Washington [September 14, 2016]