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The Past 5 Years Were the Arctic's Warmest on Record
The Arctic is still warming at twice the rate of anywhere else on Earth, and the region's air temperatures in the past five years between 2014-2018 have exceeded all previous records since 1900, according to a peer-reviewed report released by the U.S. National Oceanographic and Atmospheric Administration (NOAA) on Tuesday.
The agency's 13th annual Arctic Report Card also concluded that 2018 was second only to 2016 in terms of the region's overall warmth.
Rising temperatures have resulted in rapid loss of sea ice."In 2018 Arctic sea ice remained younger, thinner, and covered less area than in the past. The 12 lowest extents in the satellite record have occurred in the last 12 years," the report said.
This long-term warming trend has also resulted in "new issues ... that we weren't really anticipating," Emily Osborne, an official with the National Oceanic and Atmospheric Administration who presented the Arctic report card, said at a Tuesday interview at the American Geophysical Union conference in Washington.
For instance, NOAA scientists observed that melting sea ice has led to the increasing presence of harmful toxic algal blooms in the Arctic Ocean that threatens food sources.
The 2018 Arctic Report Card found the Arctic region had the second-lowest overall sea-ice coverage on record.The map shows the age of sea ice in the Arctic ice pack in March 1985 (left) and March 2018 (right). Ice that is less than a year old is darkest blue. Ice that has survived at least 4 full yeNOAA / Climate.gov
Other noticeable changes driven by Arctic warming include declining terrestrial snow cover, the melting of the Greenland Ice Sheet and lake ice and increasing summertime Arctic river discharge, the report revealed.
While the Arctic has become more green and opened more vegetation for grazing, NOAA pointed out that herd populations of caribou and wild reindeer across the tundra have declined by nearly 50 percent in the past two decades.
In the Bering Sea off Alaska's west coast, "ocean primary productivity levels in 2018 were sometimes 500 percent higher than normal levels and linked to a record low sea ice extent in the region for virtually the entire 2017/18 ice season," according to the report.
NOAA also warned that microplastic contamination is on the rise in the Arctic, posing a threat to seabirds and marine life that can ingest debris.
In response to the report card, conservation groups pointed out that the consequences of a warming Arctic go beyond the region.
"This is yet another stark reminder of climate change's indelible mark on our world. Warming temperatures are thawing permafrost and shrinking Arctic sea ice. These changes rob wildlife species of their habitat, and raise sea levels around the world, affecting communities from Nome to New Orleans," Margaret Williams, managing director of the World Wildlife Fund's U.S. Arctic programs, said in an online statement.
Williams added, "The devastating hurricanes in the southeastern U.S. and deadly wildfires in California have shown that impacts of climate change are catastrophic and costly. We know those impacts are coming faster than expected, and we know that current efforts to reduce greenhouse gases are not enough to slow the train. The good news is it's not too late to correct the course. As leaders meet this week at the UN climate talks in Poland, we urge them to run, not crawl, towards reducing emissions and accelerating a clean energy transition. Our Earth, and all species that call it home, depend on it."
Watch this NOAA video about the Arctic Report Card:
Arctic Report Card 2018 www.youtube.com
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