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Volume 7 Issue 2, February 2014

Upwelling mantle plumes are thought to be sheared by the motions of the overlying tectonic plates. Seismic imaging of a hotspot beneath the Galápagos Islands, however, identifies a plume that is not deflected in the direction of plate motion and whose characteristics are instead controlled by multistage melting processes. The image shows lava and spatter issued on 27 October 2005 from two separate vents at Sierra Negra, one of the most active and voluminous volcanoes that overlie the Galápagos mantle plume.

Article p151

IMAGE: DENNIS GEIST

COVER DESIGN: DAVID SHAND

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Letter

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Article

  • Tropospheric ozone is a potent greenhouse gas, biological irritant and significant source of highly reactive hydroxyl radicals. Simulations with a chemistry climate model suggest that shifts in atmospheric circulation can account for the seasonally dependent trends in tropospheric ozone levels observed at Mauna Loa, Hawaii, over the past three decades.

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  • Upwelling mantle plumes are thought to be sheared by the motions of the overlying tectonic plates. Seismic imaging of a hotspot beneath the Galápagos Islands, however, identifies a plume that is not deflected in the direction of plate motion and whose characteristics are instead controlled by multistage melting processes.

    • Darwin R. Villagómez
    • Douglas R. Toomey
    • Sean C. Solomon
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