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Volume 10 Issue 11, November 2017

Interactions between narrow frontal currents and topography in the Drake Passage enhance bottom mixing, according to ocean glider observations. Such interactions between frontal currents and topography could help close Southern Ocean overturning. This image shows Neumayer Channel near the northwestern coast of the Antarctic Peninsula.

Article p840; News & Views p806

IMAGE: XIAOZHOU RUAN

COVER DESIGN: TULSI VORALIA

Editorial

  • The world's inland waters are under siege. A system-level view of watersheds is needed to inform both our scientific understanding and management decisions for these precious resources.

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Commentary

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News & Views

  • Ancient lavas reveal the presence of deep mantle reservoirs with anomalously light oxygen signatures. These lavas fingerprint heterogeneous mantle domains in early Earth that may have since been mixed away.

    • Marco Fiorentini
    News & Views
  • Satellite measurements indicate that Greenland's meltwater rivers are exporting one billion tons of sediment annually, a process that is controlled by the sliding rate of glaciers. This rate is nearly 10% of the fluvial sediment discharge to the ocean.

    • Matthew A. Charette
    News & Views
  • Debate rages over which water bodies in the US are protected under federal law by the Clean Water Act. Science shows that isolated wetlands and headwater systems provide essential downstream services, but convincing politicians is another matter.

    • Mark A. Ryan
    News & Views
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Perspective

  • Enhanced protection is needed for freshwater bodies in the United States — in particular impermanent streams and wetlands outside floodplains — according to an assessment of their value and vulnerability.

    • Irena F. Creed
    • Charles R. Lane
    • Lora Smith
    Perspective
  • Many of the world's saline lakes have been shrinking due to consumptive water use. The Great Salt Lake, USA, provides an example for how the health of and ecosystem services provided by saline lakes can be sustained.

    • Wayne A. Wurtsbaugh
    • Craig Miller
    • Johnnie Moore
    Perspective
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