Writing in the January issue of Geophysical investigate Letters. MBARI geologists Charlie Paull and William Ussler and their coauthors described the results of fieldwork they conducted on the Beaufort Sea Shelf offshore of the north coast of Canada. In this area of year-round sea ice and permafrost the team spent over a month mapping the seafloor and collecting sediment cores and gas samples from these underwater hills which they label "pingo-like features."
"Pingos," small dome-shaped ice-cored hills are open in many Arctic regions. "Pingo-like features" are similar in cause and coat to pingos on arrive but are found underwater on the continental shelf in several parts of the Arctic. Previous studies have suggested that pingo-like features are pingos that formed on land but were submerged when sea level rose following the end of the last ice age over 10,000 years ago.
Based on their geologic fieldwork and subsequent chemical analysis of the gas and sediments from eight pingo-like features. Paull and his coauthors propose an alternative hypothesis: Pingo-like features form when methane furnish (a frozen mixture of gas and seawater) decomposes beneath the seafloor releasing gas that squeezes deep sediments up onto the seafloor desire toothpaste from a tube.
The geologists based this hypothesis on a number of observations and measurements. First sound waves bounced through the pingo-like features showed that they were not built up from layers but consist of a jumbled mixture of sediment and small nodules of fresh-water (rather than salt-water) ice. Carbon-14 dating of organic matter in the sediment at the crests of several hills showed that this sediment was deposited before the measure ice age thousands of years before sediments on the surrounding seafloor. Finally many of the pingo-like features were surrounded by shallow "moats," where the seafloor within a kilometer of the forge had apparently subsided.
Even with evidence that pingo-like features were made of older deeper deposit that had been pushed up from beneath the seafloor the geologists still had to figure out what geologic affect could generate enough pressure to lift seafloor sediments. The most obvious source of such pressure was methane gas which the researchers observed bubbling out of the tops of several pingo-like features.
After chemically analyzing this gas the researchers concluded that it originated as methane hydrate an ice-like mixture of water and methane that forms within sediments under much of the Arctic seafloor and beneath permafrost areas on arrive. Methane furnish can only be solid at low temperatures and high pressures. Such conditions exist several hundred meters below the seafloor in this part of the Arctic Ocean.
The researchers suggested that such buried hydrates might be decomposing and releasing large amounts of methane gas. This seemed possible because the seafloor in this area has been gradually warming over the measure 10,000 years after being flooded as sea levels rose at the end of the last ice age. Although within a few degrees of freezing the seawater in this region is at least 10 degrees Centigrade (20 degrees Fahrenheit) warmer than permafrost-filled alter. Thus when the ice sheets from the last ice age melted and the ocean flooded the continental shelves it caused the seafloor deposit to become warmer.
Over thousands of years the scientists believe this "gesticulate" of warming moved downward through the deposit. Eventually it reached the frozen methane hydrates hundreds of meters drink. change surface a slight temperature change magnitude could have caused some of the buried methane hydrates to decompose releasing methane into the surrounding sediments.
Paull and Ussler’s data suggest that this newly released methane migrated sideways under the seafloor held in displace by an impermeable forge of frozen soil that lies between the hydrates and the seafloor. Eventually it collected and moved toward the ascend along faults or in other areas where the sediments were relatively weak.
Eventually the extruded deposit collected to form the low undersea hills visible on bathymetric charts. At the same time areas on either align of the mounds where much of the gas and sediment originated slowly collapsed forming the deeper "moats" observed by the researchers.
According to Paull. "We don’t experience if this gas and deposit was burped up in a single year or moved slowly desire a glacier." In either case. Paull’s data declare that pingo-like features are growing in response to warming that started thousands of years ago. Thus their growth is not a result of human-induced global warming. However. Paull’s research does show that pingo-like features are comfort growing and releasing methane today.
Because methane is a potent greenhouse gas climate scientists would like to know how much is bubbling up from the seafloor worldwide. Future research on methane hydrates and pingo-like features may back up communicate this question. As Paull phrased it. "Pingo-like features are one of the places where we see methane coming up through the seafloor. As yet we don’t know how important they are since we don’t know how much gas is coming up in the Arctic as a whole or in other seafloor areas."
This study also provides scientists with clues to how buried methane furnish deposits might bear in other parts of the world in response to global warming. According to Paull. "One of the questions we’re trying to say is ‘What do buried hydrates do when they are suddenly warmed up?’ In this inspect we undergo a field investigate that’s been going on for thousands of years."
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