{"id":368,"date":"2015-02-05T00:00:00","date_gmt":"2015-02-04T23:00:00","guid":{"rendered":"https:\/\/site.uit.no\/cage\/2015\/02\/05\/methane-seepage-from-arctic-seabed-occurring-for-millions-of-years\/"},"modified":"2023-04-04T10:34:09","modified_gmt":"2023-04-04T08:34:09","slug":"methane-seepage-from-arctic-seabed-occurring-for-millions-of-years","status":"publish","type":"post","link":"https:\/\/site.uit.no\/cage\/2015\/02\/05\/methane-seepage-from-arctic-seabed-occurring-for-millions-of-years\/","title":{"rendered":"Methane seepage from Arctic seabed occurring for millions of years"},"content":{"rendered":"

Natural seepage of methane offshore the Arctic archipelago Svalbard has been occurring periodically for at least 2,7 million years.\u00a0<\/span><\/span>Major events of methane emissions happened at least twice during this period, according to a new study.<\/span><\/span>\u00a0<\/span><\/h4>\n

Text: Maja Sojtaric<\/p>\n

<\/p>\n

We worry about greenhouse gas methane.\u00a0Its lifetime in the atmosphere is much shorter than CO2\u00b4s, but the impact of methane on climate change is over 20 times greater than CO2 over a 100-year period. \u00a060 percent of the methane in the atmosphere comes from emissions from human activities.<\/p>\n

But methane is a natural gas,\u00a0gigatonnes<\/a>\u00a0of it trapped under the ocean floor in the Arctic.<\/p>\n

And it is leaking. And it has been leaking for longer time than the humans have roamed the Earth.<\/strong><\/p>\n

” Our planet is leaking methane gas all the time. If you go snorkeling in the Caribbean you can see bubbles raising from the ocean floor at 25 meters depth. We studied this type of release, only in a much deeper, colder and darker environment. And found out that it has been going on, periodically, for as far back as 2,7 million years.”\u00a0says\u00a0Andreia\u00a0Plaza\u00a0Faverola, researcher at CAGE and the primary author behind a new paper in Geophysical Research Letters.\u00a0<\/a><\/p>\n

She is talking about\u00a0Vestnesa\u00a0Ridge in\u00a0Fram\u00a0Strait, \u00a0a thousand\u00a0meters under the Arctic Ocean surface offshore West-Svalbard. Here, enormous – 800 meters high – gas flares rise from the seabed today. That\u2019s the size of the tallest manmade structure in the world –\u00a0Burj\u00a0Khalifa\u00a0in Dubai.<\/p>\n

https:\/\/site.uit.no\/cage\/wp-content\/uploads\/final.mp4<\/a><\/video><\/div>\n

“Half of\u00a0Vestnesa\u00a0Ridge is showing very active seepage of methane. The other half is not. But there are obvious pockmarks on the inactive half, cavities and dents in the ocean floor, that we recognized as old seepage features. So we were wondering what activates, or deactivates, the seepage in this area.,\u201d says Plaza\u00a0Faverola.<\/p>\n

Why 2,7 million years?<\/h2>\n
\"Andreia<\/a>
Andreia Plaza Faverola is researcher at Centre for Arctic Gas Hydrate, Environment and Climate at UiT. Photo: Maja Sojtaric<\/figcaption><\/figure>\n

She, and a team of marine geophysicists from CAGE, used the P-Cable technology\u00a0, to figure it out. It is a seismic instrument that is towed behind a research vessel. It recorded the sediments beneath these pockmarks. P-Cable renders images that look like layers of a cake. It also enables scientists to visualize deep sediments in 3D.<\/p>\n

” We know from other studies in the regio<\/a>n that the sediments we are looking at in our seismic data are at least 2.7 million years old. This is the period of increase of glaciations in the Northern Hemisphere, which influences the sediment..\u00a0\u00a0The P-Cable enabled us to see features in this sediment, associated with gas release in the past\u00a0. \u201c<\/p>\n

\u201cThese features can be buried pinnacles or cavities that form what we call gas chimneys in the seismic data. Gas chimneys appear like vertical disturbances in the layers of our sedimentary cake.\u00a0\u00a0This enables us to reconstruct the evolution of gas expulsion from this area for at least 2,7 million years.” says\u00a0Andreia\u00a0Plaza\u00a0Faverola.<\/p>\n

The seismic signal penetrated into 400 to 500 meters of sediment to map this timescale.<\/p>\n

How is the methane released?<\/h2>\n

By using this method, scientists were able to identify two major events of gas emission throughout this time period: One 1,8 million years ago, the other 200 000 years ago.<\/p>\n

This means that there is something that activated and deactivated the emissions several times. Plaza\u00a0Faverola\u00b4s\u00a0paper gives a plausible explanation: It is the movement of the tectonic plates that influences the gas release.\u00a0Vestnesa\u00a0is not like California though, riddled with earthquakes because of the moving plates. The ridge is on a so-called passive margin. But as it turns out, it doesn\u00b4t take a huge tectonic shift to release the methane stored under the ocean floor.<\/p>\n

“Even though\u00a0Vestnesa\u00a0Ridge is on a passive margin, it is between two oceanic ridges that are slowly spreading. These spreading ridges resulted in separation of Svalbard from Greenland and opening of the\u00a0Fram\u00a0Strait. The spreading influences the passive margin of West-Svalbard, and even small mechanical collapse in the sediment can trigger seepage.” says\u00a0Faverola.<\/p>\n

Where does the methane come from?<\/h2>\n
\"This<\/a>
Can you see the vertical disturbance in the layers? This is how a gas chimney appears in the seismic record. Credit: Andreia Plaza Faverola\/CAGE<\/figcaption><\/figure>\n

The methane is stored as gas hydrates, chunks of frozen gas and water, up to hundreds of meters under the ocean floor.\u00a0Vestnesa\u00a0hosts a large gas hydrate system. There is some concern that global warming of the oceans may melt this icy gas and release it into the atmosphere. That is not very likely in this area, according to\u00a0Andreia\u00a0Plaza\u00a0Faverola.<\/p>\n

” This is a deep water gas hydrate system, which means that it is in permanently cold waters and under a lot of pressure. This pressure keeps the hydrates stable and the whole system is not vulnerable to global temperature changes. But under the stable hydrates there is gas that is not frozen. The amount of this gas may increase if hydrates melt at the base of this stability zone, or if gas from deeper in the sediments arrives into the system.\u00a0\u00a0This could increase the pressure in this part of the system, and the free gas may escape the seafloor through chimneys.\u00a0Hydrates would still remain stable in this scenario\u00a0.\u201d<\/p>\n

\u00a0Historical methane peaks coincide with\u00a0increase in temperature<\/h2>\n

Throughout Earth\u00b4s history there have been several short periods of significant increase in temperature. And these periods often coincide with peaks of methane in the atmosphere\u00a0, as recorded by ice cores. Scientists such as Plaza\u00a0Faverola\u00a0are still debating about the cause of this methane release in the past.<\/p>\n

” One hypotheses is that massive gas release from geological sources, such as volcanos or ocean sediments may have influenced global climate..\u00a0\u00a0What we know is that there is a lot of methane released at present time from the ocean floor. What we need to find out is if it reaches the atmosphere, or if it ever did.”<\/p>\n

Historical events of methane release, such as the ones in the\u00a0Vestnesa\u00a0Ridge, provide crucial information that can be used in future climate modeling. Knowing if these events repeat, and identifying what makes them happen, may help us to better predict the potential influence of methane from the oceans on future climate.<\/p>\n

 <\/p>\n

Reference:\u00a0Role of tectonic stress in seepage evolution along the gas hydrate-charged\u00a0Vestnesa\u00a0Ridge,\u00a0Fram\u00a0Strait<\/i>. A.Plaza\u00a0Faverola, S.B\u00fcnz, J.E.Johnson, S. Chand, J.\u00a0Knies, J.\u00a0Mienert\u00a0and P. Franek. Geophysical Research Letters. 2015.<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Natural seepage of methane offshore the Arctic archipelago Svalbard has been occurring periodically for at … <\/p>\n

Read more \u00abMethane seepage from Arctic seabed occurring for millions of years\u00bb<\/span><\/a><\/p>\n","protected":false},"author":123546,"featured_media":371,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9],"tags":[],"class_list":["post-368","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"\nMethane seepage from Arctic seabed occurring for millions of years - CAGE, Centre for Arctic Gas Hydrate, Environment and Climate<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/site.uit.no\/cage\/2015\/02\/05\/methane-seepage-from-arctic-seabed-occurring-for-millions-of-years\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Methane seepage from Arctic seabed occurring for millions of years - 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