They’ve been called “bubble chasers,” and “seep seekers,” though they sometimes call themselves “flare hunters.” They’re a small group of scientific specialists searching the world’s oceans for tiny streams of methane gas-filled globules rising from seafloor sediments. On expeditions ranging from the Arctic to Antarctica, carried out in shallow waters to thousands of meters below the sea’s surface, their studies reveal how these tiny globules can potentially add to global warming while also creating unique ecosystems. But even when deploying advanced modern technology, finding these cold-ocean methane seeps isn’t easy. And it may be even harder to determine exactly how seafloor methane releases could factor into the future of humanity and the planet. Map showing the known global occurrences of methane-derived carbonates used to compile a study of seafloor methane seepage across the last 150 million years. Image courtesy of Oppo et al. (2020). Bubbles flowing from a methane seep at El Quisco, off the coast of Chile. Researchers found the seeps using sonar-based bubble mapping, bathymetric mapping, tracking in situ methane concentration measurements, and visual surveys with the ROV SuBastian. Image by ROV SuBastian/Schmidt Ocean Institute (CC BY-NC-SA). Hunting telltale bubbles “These seeps are fascinating and extreme environments,” said Claudio Argentino, a sediment biogeochemist at UiT, The Arctic University of Norway, whose fieldwork started at ancient methane seep sites in Italy’s Apennine Mountains in 2015, during his doctoral studies, and now takes him to the Arctic Ocean. “We want to know how much gas is escaping the seafloor sediment…This article was originally published on Mongabay
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