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Huge and widespread volcanic eruptions triggered the end-Triassic extinction

2013-03-23 19:19:00| Climate Ark Climate Change & Global Warming Newsfeed

ScienceDaily: More than 200 million years ago, a massive extinction decimated 76 percent of marine and terrestrial species, marking the end of the Triassic period and the onset of the Jurassic. This devastating event cleared the way for dinosaurs to dominate Earth for the next 135 million years, taking over ecological niches formerly occupied by other marine and terrestrial species. It's not entirely clear what caused the end-Triassic extinction, although most scientists agree on a likely scenario: Over a relatively...

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Seeding Atlantic Ocean with Volcanic Iron Did Little to Lower CO2

2013-03-21 20:20:00| Climate Ark Climate Change & Global Warming Newsfeed

Scientific American: Plankton, tiny marine organisms, are a good way of cleansing the atmosphere of one of the main greenhouse gases, carbon dioxide. To do this they need dissolved iron to help them to grow, and if they lack iron then they cannot do much to reduce CO2 levels. So the eruption in 2010 of an Icelandic volcano gave scientists a perfect opportunity to see how much the cataclysm helped the plankton by showering them with unexpected clouds of iron. Their verdict, published in the journal Geophysical Research...

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Volcanic Eruptions May be Masking Lost Warming

2013-03-11 16:01:00| Climate Ark Climate Change & Global Warming Newsfeed

Climate News Network: Climate scientists think they may have found at least part of the answer to a conundrum which has been puzzling them recently -- why the atmosphere has not warmed as much as expected over the last decade or so. A team led by the University of Colorado-Boulder (CU-Boulder) thinks the reason may be emissions of sulphur dioxide (SO2), a known inhibitor of atmospheric warming, from many of the world's volcanoes. The puzzle is why the global average temperature has not increased as expected in step...

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Volcanic eruptions offset small part of greenhouse gas-driven global warming: Study

2013-03-02 15:00:00| Climate Ark Climate Change & Global Warming Newsfeed

Summit County: A series of small to mid-sized volcanic eruptions the past 10 years were the main factor in the formation of stratospheric sulfuric acid that reflected the sun`s energy and partially offset the effects of heat-trapping greenhouse gases. "This new study indicates it is emissions from small to moderate volcanoes that have been slowing the warming of the planet," said Ryan Neely, a researcher at the Cooperative Institute for Research in Environmental Science and doctoral student at CU Boulder. Neely...

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