Greenland: Land of ice on fire
Greenland, home to the world's largest permanent ice sheet outside Antarctica, is being swept by wildfires. Scientists say global warming and increased plant cover are likely factors.
Greenland, the vast Arctic island with the biggest permanent ice sheet outside Antarctica, is burning.
Since late July, wildfires have raged across an ever-larger area of the landmass - and with greater intensity - than ever before observed.
Experts say it is too early to draw firm conclusions linking the fire to climate change because no long-term data is available to put the blaze in context. However, unusually warm and dry conditions this year could have been a factor.
"It's unprecedented in the short 18-year observational record," Jason Box, a climate scientist at the Geological Survey of Denmark and Greenland, told DW. "We also know that temperatures in Greenland are probably higher [than they have been over] the last 800 years."
Although the origin of the blaze is unclear - with lightening and a stray cigarette as possible suspects - what is clear is how it has been spreading across remote areas of grassland and low shrub.
Greenland's getting greener
Greenland conjures images of white, frozen expanses. But Box says global warming means it's getting greener all the time. "There's a shorter snow-cover season, and that allows the plant life to expand," he explained.
The Arctic is heating up around twice as fast as the global average. At the same time, rainfall around the world is also increasing - and that trend as well is more present in the Artic.
"More rain is a widespread symptom of climate change," Box said. "You get more precipitation - and where you get the biggest increase is in the Arctic."
For Greenland, warmer, wetter conditions mean more vegetation - which, seemingly paradoxically, could be a factor for the fire.
Greenland: Greener than you might think
"It's growing more, and so there's just more that can burn," Box said. "We should expect more of these types of fires."
And living plants may not be all that's fueling the fire.
Unleashing ancient carbon
Scientist suspect the fact it's kept smoldering for more than two weeks means it's consuming peat - a dense, carbon-rich accumulation of decayed vegetable matter that builds up over thousands of years.
Stef Lhermitte, a scientist at the Delft University department of geoscience and remote sensing in the Netherlands, was among the first to draw attention to blaze, revealed by NASA satellite data.
He says the relatively small scale of the blaze - compared to recent wildfires in Russia and British Colombia, for example - means emissions released from this ancient carbon sink will probably not have a major impact on greenhouse gas emissions by themselves.
In terms of longer-term conclusions, "it's now up to the scientific community to delve deeper," Lhermitte told DW.
Field research into the affected area, and a wider look at the causes and impacts of the fire, could enhance our picture of how climate change is affecting the Arctic.
"One interesting question is: Are these fires really the result of climate change, and will they be bigger in the future? Secondly, what will be the impact of these fires on the ice sheet and surrounding areas," Lhermitte said.
One possible impact of the fire is that the resulting soot may settle on the ice, making it darker and thus reducing its reflection of heat from the sun.
Box is among a group of scientists behind the Dark Snow project, which is investigating exactly this phenomenon: how soot, mineral dust and microbes are speeding up the Arctic melt.
"Preliminary results are consistent with some other publications, which confirm that fire can enhance melt," Box said. "So that's a multiplier in climate change."
As Greenland's ice sheets melt, that contributes to sea level rise
Box and his team are planning to gather snow-core data in Greenland next year. "We hope that we can fingerprint these fires, to [confirm] that these fires are enhancing melt - that's the hypothesis we're testing," he told DW.
The total footprint of the fire extends over 18 square kilometers - some of which has now stopped burning, leaving isolated patches smoldering.
Local authorities said they hope rainfall forecast for this week would help further contain the blaze.
So far, the biggest problem for local people and wildlife has been heavy smoke - which has reportedly driven animals like reindeer and musk ox out of the area, and disrupted the annual reindeer hunting season.
Tourists have also been warned to stay away from a popular hiking trail.
Operation IceBridge studies the processes that link the polar regions with the Earth's climate system. Rapidly changing polar ice means researchers need to use highly sophisticated airborne technology to measure annual changes in thickness and movement - onboard a retrofitted 1966 Lockheed P-3 aircraft.
It's all part of a six-year project under NASA's Cryosphere Program, in which researchers are carrying out a series of eight-hour flights over Greenland (from March to May) and Antarctica (October to November) in order to accurately model a three-dimensional view of ice sheets, ice shelves and sea ice.
In 2003, NASA launched a satellite called ICESat (Ice, Cloud, and Land Elevation Satellite) for the purpose of monitoring changes in polar ice. However, it suddenly stopped collecting data in 2009. With ICESat-II not expected to be ready for launch until 2018, researchers needed to somehow bridge the nine-year data gap between the two satellites.
Enter operation IceBridge, which has been keeping a close eye on the polar ice - as well as its cute inhabitants - while ICESat-II is prepped for launch next year. Or is the hare rather watching over these strange bipeds?
The data collected during these missions is critical for researchers in predicting the effects climate change is already having on the polar ice, including a rise in sea levels. According to NASA scientists, on March 7, 2017, sea ice in the Arctic reached the lowest maximum wintertime extent ever recorded.
A glacier is visible through mist above Ellesmere Island. Operation IceBridge allows scientists gather valuable data by using special ice-penetrating radar, which only functions properly when used in lower altitudes.
Scientists have long warned that the Arctic Circle will be one of the regions hit hardest by climate change - and effects are already becoming evident. The darker the color, the thinner the ice.
Once ICESat-II is up and running, it will have the ability to take continuous measurements over a much wider area - unlike the current aircraft-based method, which is limited only to annual surveys.
Icebergs are locked in sea ice, as seen from the research aircraft along the Upper Baffin Bay coast above Greenland. Aircraft-based research allows its human pilots to focus on specific areas of scientific interest, rather than simply conducting a flyover on a fixed path.
As in Greenland, the ice fields of Ellesmere Island in Canada are also gradually retreating due to warming temperatures. The future of ICESat-II is now in question, as US President Donald Trump has pledged to strip funding for NASA's entire earth science program.
Why is the Arctic melting faster than the Antarctic?
A recent report says the Arctic may be ice-free by 2040. The Antarctic is also melting, albeit far slower, and in a less regular pattern. Why do the two poles react so differently in the face of climate change? (14.06.2017)
Sea level rising at triple speed since 1990
According to a new study, the world's oceans are rising almost three times as fast as they were 25 years ago. Scientists say coastal regions face a much greater risk than previously thought. (24.05.2017)
A view over our changing poles
With its operation IceBridge, NASA is currently conducting research flights over the Arctic to monitor ice loss. The photos are spectacular - and worrisome. (07.04.2017)
How climate change is increasing forest fires around the world
Have wildfires increased globally over recent years? And if so, is global warming to blame? Research has illuminated this, along with what wildfires do to us and our environment, and which areas are most vulnerable. (19.06.2017)
Old, older, Greenland shark
No vertebrate lives as long as the Greenland shark, a new study says. But this Methuselah of the animal kingdom is still quite puzzling. Do they really only reach sexual maturity at age 150? (12.08.2016)
Humans postpone the next ice age through climate change - so what?
Ice ages have shaped the global environment and human evolution. A recent study indicates humans are changing these natural cycles: Our CO2 emissions are likely to postpone the next ice age. What does this mean? (26.01.2016)