New study measures permafrost changes with impacts to carbon cycle
Global warming is limiting the growth of seasonal ice on Arctic lakes, which could have implications for the global carbon cycle. new study accepted for publication in Geophysical Research Letters, permafrost beneath shallow Arctic lakes is starting to thaw — another sign of the widespread Arctic meltdown due to climate change.
The changes stem from warmer winter temperatures and increased snowfall during the past 30 years. Lakebed temperatures of Arctic lakes less than 1 meter (3 feet) deep have warmed by 2.4 degrees Celsius (4.3 degrees Fahrenheit) during the past three decades, and during five of the last seven years, the mean annual lakebed temperature has been above freezing, the study found. Continue reading “Climate: Thawing Arctic lakes could boost greenhouse gases”→
New study shows soil moisture is a big factor in global warming equation
Methane won’t be the only problem as Arctic permafrost thaws in the coming decades. A new study shows that, as frozen permafrost areas warm and dry out, they will also release more CO2. The study was led by Northern Arizona University assistant research professor Christina Schädel and published in the journal Nature Climate Change.
Near-surface permafrost areas could shrink by 16-24 percent
Global warming is likely to take a big bite out of Alaska’s permafrost the next few decades, U.S. Geological Survey researchers said after analyzing new satellite data.
The maps suggest that the near-surface permafrost that presently underlies 38 percent of boreal and arctic Alaska would be reduced by 16 to 24 percent by the end of the 21st century under widely accepted climate scenarios. Permafrost declines are more likely in central Alaska than northern Alaska. Continue reading “USGS study projects Alaska permafrost losses”→
Alaska study helps quantify climate impacts of melting permafrost
Much of the carbon stored in ancient Alaska soils could be released to the atmosphere shortly upon melting, according to a new study that aimed to help quantify how fast permafrost decomposes and how much carbon dioxide is produced in the process.
LINZ — The Earth’s permafrost regions are one of the biggest wild cards in the climate change equation. Some researchers have warned that a quick meltdown could release so much methane that it would trigger runaway global warming, while other recent studies suggest that permafrost will probably melt gradually.
The bottom line is that scientists still don’t know for sure how fast the meltdown will be, but a new data portal called the Global Terrestrial Network for Permafrost will help researchers coordinate information and serve as an early warning system for researchers and decision-makers around the globe.
‘The real and imminent threat posed by permafrost thawing must be communicated clearly and broadly to the general public and the policy community’
FRISCO — Policy makers should pay more attention to the potential to the potential for greenhouse gas emissions from melting permafrost, a team of researchers warned in a special bulletin, released as President Obama prepares to attend an international conference on the Arctic.