{"id":537792,"date":"2022-10-18T13:39:46","date_gmt":"2022-10-18T17:39:46","guid":{"rendered":"https:\/\/www.rochester.edu\/newscenter\/?p=537792"},"modified":"2022-10-25T14:45:43","modified_gmt":"2022-10-25T18:45:43","slug":"ancient-ocean-methane-not-an-immediate-climate-change-threat-537792","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/ancient-ocean-methane-not-an-immediate-climate-change-threat-537792\/","title":{"rendered":"Ancient ocean methane not an immediate climate change threat"},"content":{"rendered":"

New research shows reservoirs of ocean methane in mid-latitude regions will not be released to the atmosphere under warming conditions.<\/h2>\n

Deep below the ocean\u2019s surface, the seafloor contains large quantities of naturally occurring, ice-like deposits made up of water and concentrated methane gas. For decades, climate scientists have wondered if this methane hydrate reservoir might \u201cmelt\u201d and release massive amounts of methane to the ocean and the atmosphere as ocean temperatures warm.<\/p>\n

New research from scientists at the University of Rochester<\/a>, the US Geological Survey, and the University of California Irvine is the first to directly show that methane released from decomposing hydrates is not<\/em> reaching the atmosphere.<\/p>\n

The researchers, including John Kessler<\/a>, a professor in the Department of Earth and Environmental Sciences<\/a>, and DongJoo Joung, a former research scientist in Kessler\u2019s lab and now an assistant professor in the Department of Oceanography at Pusan National University in Korea, carried out the study in mid-latitude regions\u2014Earth\u2019s subtropical and temperate zones.<\/p>\n

While the stability of the methane hydrate reservoir is sensitive to changes in temperature, \u201cin the mid-latitude regions where this study was conducted, we see no signatures of hydrate methane being emitted to the atmosphere,\u201d says Joung, the first author of the study<\/a>, published in Nature Geoscience.<\/em><\/p>\n

How methane hydrates form, stabilize, and degrade<\/strong><\/h3>\n

Locked away in ice-like methane hydrates, methane has no effect on climate. But released into the atmosphere, it acts as a powerful, heat-trapping gas. Today\u2019s atmosphere contains methane emitted from human activities\u2014such as fossil fuel extraction and use, agriculture, and landfills\u2014and methane emitted naturally from wetlands, wildfires, aquatic environments, and coastal zones and onshore seeps.<\/p>\n

Ocean sediments are massive storehouses for ancient reservoirs of natural methane in the form of methane hydrates.<\/p>\n

\u201cThe amount of methane locked up in gas hydrates globally is staggering,\u201d Joung says.<\/p>\n

Scientists have hypothesized that the release of even part of this reservoir could significantly exacerbate climate change.<\/p>\n

Says Kessler: \u201cImagine a bubble in your fish tank going from the bottom of the tank to the top and exploding and releasing whatever was in that bubble to the air above it\u2014that was the way many people viewed how hydrate decomposition might contribute to our warming world.\u201d<\/p>\n

Gas hydrates form where both methane and water meet at high-pressure and low-temperature conditions. In the parts of the ocean located in the temperate and subtropical mid-latitudes, hydrates can remain stable only at depths below about 500 meters (approximately 1640 feet) beneath the sea surface. Generally, hydrates become more stable the deeper they are beneath the sea surface.<\/p>\n

\"two
DongJoo Joung (left), a former research scientist in the lab of John Kessler, and Mihai Leonte ’19 (PhD) use a giant suction hose to collect ocean water. (University of Rochester photo \/ John Kessler)<\/figcaption><\/figure>\n

That means the upper stability boundary for methane hydrates\u2014500 meters\u2014is a \u201csweet spot.\u201d It is the most susceptible to melting under warming seawater temperatures, and it is the shortest distance a bubble of \u201cpreviously-hydrated” methane would have to travel before reaching the atmosphere.<\/p>\n

But even in this sweet spot, the researchers did not observe evidence of hydrate methane being emitted to the atmosphere.<\/p>\n

Fingerprinting the methane source<\/strong><\/h3>\n

To conduct their study, the researchers measured unique isotopic \u201csignatures\u201d of oceanic methane in samples of seawater they collected from various depths in the mid-latitude regions of both the Atlantic and Pacific oceans. This allowed them to directly identify the origin of methane in seawater.<\/p>\n

To make even one measurement, they need an enormous amount of water\u2014a single sample includes about two thousand gallons of seawater. The researchers used a giant suction hose to collect the samples and employed a novel technique their team developed<\/a> that involves extracting methane from each sample. The researchers compressed the methane into cylinders that they then brought back to Kessler\u2019s lab on the River Campus to prepare for analysis.<\/p>\n

As the researchers documented, ancient methane is being released from the seafloor. However, they found negligible amounts of this ancient methane in the surface waters. They concluded, based on earlier studies, that this methane gas first dissolves in the deeper waters and then oceanic microbes biodegrade the methane, turning it into carbon dioxide before it leaves the water.<\/p>\n

Previous work by Kessler\u2019s group and others found that these processes are active in the mid-latitude regions and that similar processes helped to mitigate the effects of methane<\/a> released during the Deepwater Horizon oil spill.<\/p>\n

Carbon dioxide, while also a greenhouse gas, \u201ccan be incorporated into other carbon reservoirs in seawater,\u201d says Kessler. While some of the carbon dioxide could also be emitted into the atmosphere, it would happen over much longer time scales\u2014thousands of years\u2014and the warming wouldn\u2019t be as acute.<\/p>\n

The new study builds on previous work<\/a> in Kessler\u2019s lab, focused on methane hydrates in the Arctic Ocean. Arctic waters are another sweet spot for the study of hydrates because the cold temperature means that hydrates destabilize in shallower waters, where they have a short distance to travel to reach the atmosphere.<\/p>\n

Kessler calls these results \u201cgood news\u201d\u2014but news that underscores the work that remains. \u00a0\u201cThis tells us that in order to reduce sources of methane to the atmosphere, we can focus more of our attention on mitigating human emissions,\u201d he says.<\/p>\n

\n

Read more<\/strong><\/h3>\n
\n
\"twoTo combat climate change, human activities more important than natural feedbacks<\/strong><\/a>
\nPermafrost in the soil and methane hydrates deep in the ocean are large reservoirs of ancient carbon. But even if methane is released from these large natural stores, new Rochester data shows that the bigger concern is methane released from human activities.<\/span><\/div>\n
\"twoMethane emitted via human fossil fuel use \u2018vastly underestimated\u2019<\/strong><\/a>
\nReducing emissions from human activities like fossil fuel extraction and use will have a greater impact on curbing future global warming than scientists previously thought, a new Rochester study suggests.<\/span><\/div>\n
\"overheadFirst-of-its-kind study examines Great Lakes methane<\/strong><\/a>
\nThere is very little data on the methane levels in the Great Lakes, the world\u2019s largest collection of freshwater. Earth and environmental sciences professor John Kessler invited five undergraduate students and a master\u2019s degree candidate on a research venture designed to change that.<\/span><\/div>\n

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

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