There are several potential explanations for whatâ€™s going on here. The most likely is that some combination of increasingly infrequent summer snowstorms, wind-blown dust, microbial activity, and forest fire soot led to this yearâ€™s exceptionally dark ice. A more ominous possibility is that what weâ€™re seeing is the start of a cascading feedback loop tied to global warming.
Box mentions this summerâ€™s mysterious Siberian holes and offshore methane bubbles as evidence that the Arctic can quickly change in unpredictable ways.
This year, Greenlandâ€™s ice sheet was the darkest Box (or anyone else) has ever measured. Box gives the stunning stats: â€œIn 2014 the ice sheet is precisely 5.6 percent darker, producing an additional absorption of energy equivalent with roughly twice the US annual electricity consumption.â€
Perhaps coincidentally, 2014 will also be the year with the highest number of forest fires ever measured in Arctic.
Box ran these numbers exclusively for Slate, and what he found shocked him. Since comprehensive satellite measurements began in 2000, never before have Arctic wildfires been as powerful as this year. In fact, over the last two or three years, Box calculated that Arctic fires have been burning at a rate thatâ€™s double that of just a decade ago. Box felt this finding was so important that he didnâ€™t want to wait for peer review, and instead decided to publish first on Slate. Heâ€™s planning on submitting these and other recent findings to a formal scientific journal later this year.
From the CBC