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  • ESS faculty Steig and Fudge to lead major new drilling project in Antarctica
    Monday, July 13, 2020
    NSF-funding research led by Eric Steig and TJ Fudge at UW, with Heidi Roop at U. Minnesota, Murat Aydin at UC Irvine, Mark Twickler and Joe Souney at UNH, will drill for ice capturing West Antarctica’s last collapse. Read More
  • Early life was pumping out oxygen, but the Earth's mantle was absorbing it | Universe Today
    Friday, June 12, 2020
    The Great Oxidation Event took place 2.4 billion years ago. That's when photosynthetic bacteria flooded the atmosphere with oxygen, banishing early, non-oxygen using lifeforms to the fringes of the Earth. But photosynthetic bacteria were pumping out oxygen long before the event. Where did all the oxygen go? A new study examined that question. Shintaro Kadoya, a postdoctoral scholar in Earth and space sciences at the UW, and David Catling, professor of Earth and space sciences at the UW, are quoted. Read More
  • Volcanic activity and changes in Earth's mantle were key to rise of atmospheric oxygen
    Tuesday, June 9, 2020

    Oxygen first accumulated in the Earth's atmosphere about 2.4 billion years ago, during the Great Oxidation Event. A long-standing puzzle has been that geologic clues suggest early bacteria were photosynthesizing and pumping out oxygen hundreds of millions of years before then. Where was it all going?

    Something was holding back oxygen's rise. A new interpretation of rocks billions of years old finds volcanic gases are the likely culprits. The study led by the University of Washington was published in June in the open-access journal Nature Communications.

    "This study revives a classic hypothesis for the evolution of atmospheric oxygen," said lead author Shintaro Kadoya, a UW postdoctoral researcher in Earth and space sciences. "The data demonstrates that an evolution of the mantle of the Earth could control an evolution of the atmosphere of the Earth, and possibly an evolution of life."

    layered brown rock

    These giant mounds of fossil stromatolites from about 2.5 billion years ago are located in South Africa. For scale, notice a person's dangling legs at the top center. These layered minerals were deposited on an ancient coastline by communities of microbes, including photosynthetic bacteria that generated oxygen. The new study suggests that for millions of years the oxygen produced by these microbes reacted with volcanic gases before it began to accumulate in Earth's atmosphere, about 2.4 billion years ago.David Catling/University of Washington

    Multicellular life needs a concentrated supply of oxygen, so the accumulation of oxygen is key to the evolution of oxygen-breathing life on Earth.

    "If changes in the mantle controlled atmospheric oxygen, as this study suggests, the mantle might ultimately set a tempo of the evolution of life," Kadoya said.

    The new work builds on a 2019 paper that found the early Earth's mantle was far less oxidized, or contained more substances that can react with oxygen, than the modern mantle. That study of ancient volcanic rocks, up to 3.55 billion years old, were collected from sites that included South Africa and Canada.

    Robert Nicklas at Scripps Institution of Oceanography, Igor Puchtel at the University of Maryland, and Ariel Anbar at Arizona State University are among the authors of the 2019 study. They are also co-authors of the new paper, looking at how changes in the mantle influenced the volcanic gases that escaped to the surface.

    The Archean Eon, when only microbial life was widespread on Earth, was more volcanically active than today. Volcanic eruptions are fed by magma - a mixture of molten and semi-molten rock - as well as gases that escape even when the volcano is not erupting.

    Some of those gases react with oxygen, or oxidize, to form other compounds. This happens because oxygen tends to be hungry for electrons, so any atom with one or two loosely held electrons reacts with it. For instance, hydrogen released by a volcano combines with any free oxygen, removing that oxygen from the atmosphere.

    brownish-red rock with sharp ridges

    An ancient komatiite lava from the Komati Valley in South Africa. Notice the tool on the right for scale. Co-authors used these types of lavas from more than 3 billion years ago to learn how the chemistry of the mantle has changed.CSIRO/Wikipedia

    The chemical makeup of Earth's mantle, or softer layer of rock below the Earth's crust, ultimately controls the types of molten rock and gases coming from volcanoes. A less-oxidized early mantle would produce more of the gases like hydrogen that combine with free oxygen. The 2019 paper shows that the mantle became gradually more oxidized from 3.5 billion years ago to today.

    The new study combines that data with evidence from ancient sedimentary rocks to show a tipping point sometime after 2.5 billion years ago, when oxygen produced by microbes overcame its loss to volcanic gases and began to accumulate in the atmosphere.

    "Basically, the supply of oxidizable volcanic gases was capable of gobbling up photosynthetic oxygen for hundreds of millions of years after photosynthesis evolved," said co-author David Catling, a UW professor of Earth and space sciences. "But as the mantle itself became more oxidized, fewer oxidizable volcanic gases were released. Then oxygen flooded the air when there was no longer enough volcanic gas to mop it all up."

    This has implications for understanding the emergence of complex life on Earth and the possibility of life on other planets.

    "The study indicates that we cannot exclude the mantle of a planet when considering the evolution of the surface and life of the planet," Kadoya said.

    This research was funded by the National Science Foundation.

     

    For more information, contact Kadoya at skadoya@uw.edu or Catling at dcatling@uw.edu.

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  • Analysis: It's time to rethink the disrupted US food system from the ground up | The Conversation
    Friday, June 5, 2020
    "The COVID-19 pandemic and resulting economic shutdowns have severely disrupted and spotlighted weaknesses in the U.S. food system. Farmers, food distributors and government agencies are working to reconfigure supply chains so that food can get to where it's needed. But there is a hidden, long-neglected dimension that should also be addressed as the nation rebuilds from the current crisis," write the UW's David Montgomery, professor of Earth and space sciences; Jennifer Otten, associate professor of environmental and occupational health sciences; and Sarah Collier, assistant professor of environmental and occupational health sciences. Read More
  • NSF Plots a Course for the Next Decade of Earth Sciences Research
    Thursday, May 21, 2020
    ESS faculty Kate Huntington is highlighted today for her leadership on the decadal vision for Earth Sciences at NSF, produced by the National Academies. A new report released this week by the National Academies of Sciences, Engineering, and Medicine, "A Vision for NSF Earth Sciences 2020–2030: Earth in Time", lays out recommendations for how the National Science Foundation (NSF) should invest in the next decade of Earth sciences research. The report highlights 12 priority questions for the field to explore from 2020 to 2030, from the deceptively simple “What is an earthquake?” to the more urgent “How can Earth science research reduce the risk and toll of geohazards?”

    Link to full report:
    https://www.nap.edu/catalog/25761/a-vision-for-nsf-earth-sciences-2020-2030-earth-in?mc_cid=042f9a6a09&mc_eid=9b486ee580 Read More
  • How routine monitors weather the pandemic storm | Eos
    Tuesday, May 19, 2020
    Much of routine monitoring can be done remotely these days, but networks aren't completely immune to COVID-19's society-halting symptoms. Harold Tobin, director of the UW-based Pacific Northwest Seismic Network and professor of Earth and space sciences at the UW, is quoted. Read More
  • Scientist killed in Mount St. Helens eruption remembered 40 years after deadly blast | KING 5
    Monday, May 18, 2020
    David Johnston, a scientist studying Mount St. Helens when it erupted in 1980, was killed in the blast. His body was never recovered. Steve Malone, emeritus research professor of Earth and space sciences at the UW, is quoted. Read More
  • A plate boundary emerges between India and Australia | Eos
    Monday, May 18, 2020
    Tectonic plates blanket the Earth like a patchwork quilt. Now, researchers think they've found a new plate boundary -- a line of stitching in that tectonic quilt -- in the northern Indian Ocean. Kevin Kwong, a postdoctoral scholar in Earth and space sciences at the UW, is quoted. Read More
  • 2.9 earthquake out of Mead, WA felt across the Inland Northwest on Friday afternoon | KREM
    Monday, May 18, 2020
    A 2.9 magnitude earthquake hit Mead, Washington around 2:30 p.m. on Friday according to the United States Geological Survey. Paul Bodin, UW research professor of Earth and space sciences and network manager of the UW-based Pacific Northwest Seismic Network, is referenced. Read More
  • 40 years after Mount St. Helens eruption, pandemic sparks parallels | Geekwire
    Sunday, May 17, 2020
    Seismologist Steve Malone, emeritus research professor of Earth and space sciences at the UW, feels a magnitude-5.1 rumble of deja vu whenever he hears the latest developments in the debate over reopening businesses amid the coronavirus outbreak. It reminds Malone of the debate that raged in the days before Mount St. Helens blew its top on May 18, 1980. Read More