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Colorado

On the right is the first stratigraphic section of the Grand Canyon, from Powell’s 1875 report, showing what would later be termed the Great Unconformity. A is the metamorphic basement—the oldest rocks that have been contorted. B is the Precambrian Grand Canyon Supergroup, which is composed of tilted sedimentary rocks that lack fossil assemblages. C indicates flat-lying Paleozoic rocks, which contain fossils marking the explosion of life. Two unconformities can be seen at x and y, with the former marking the Great Unconformity. The image on the left is a recent photograph of the Grand Canyon from Walhalla Plateau, with the red line showing the Great Unconformity. Blue lines trace the tilted layers below the famed surface, and yellow lines trace the flat-lying sedimentary rocks on top.
Posted inNews

The Great Unconformity or Great Unconformities?

by Alka Tripathy-Lang 23 December 202231 January 2023

Some scientists think the Great Unconformity was caused by Snowball Earth’s glaciations. Recent work suggests these phenomena might not be related.

Aerial view of the Colorado River
Posted inNews

Building Resilience in the Face of a Dwindling Colorado River

by Jane Palmer 5 August 202225 October 2022

Policymakers, industry and conservation professionals, and tribal members explore pathways to a sustainable future for the millions of people reliant on the “lifeblood of the American West.”

A wide view of snow-covered pines in mountains.
Posted inResearch Spotlights

Trees Wearing Accelerometers Help Track Snowstorms

by Rebecca Dzombak 15 April 202215 April 2022

This device allows scientists to measure how much snow is trapped in canopies and predict changes to snowpack—a critical factor in annual water availability.

A room in a home filled with atmospheric research equipment, including three gas cylinders that are connected to a mass spectrometer.
Posted inNews

Crowdsourced Science Helps Monitor Air Quality in Smoke-Damaged Homes

by Fionna M. D. Samuels 23 February 202231 May 2022

Researchers collaborate with residents to measure airborne chemicals in homes and evaluate how clean the air really is after remediation from Colorado’s Marshall Fire.

This junction in Colorado’s Snake River is tinged with orange due to acid rock drainage.
Posted inNews

New Contamination Concern for Colorado Streams

by Nancy Averett 14 October 202121 March 2022

Abandoned hardrock mines and climate change cause metals and other elements to leach into streams. They also put rare earth elements into the water, a new study finds.

SAIL site in Gothic, Colo..
Posted inNews

Collaboration in the Rockies Aims to Model Mountain Watersheds Worldwide

by Saima May Sidik 21 September 202121 March 2022

As Earth’s climate changes at an unprecedented rate, the Surface Atmosphere Integrated Field Laboratory is studying precipitation on an unprecedented scale.

Plot showing distribution of iron species at three locations
Posted inEditors' Highlights

Zero-valent Iron in the Oxidizing Atmosphere?

by Jonathan H. Jiang 26 October 20205 May 2022

A comparative study of urban, semi-urban, and rural sites reveals that the species of atmospheric iron varies depending on location.

Smoke from the Camp fire near Paradise, Calif. (top) and the Hill and Woolsey fires near Los Angeles (bottom) spreads across the West Coast and a portion of the Pacific Ocean in this 9 November 2018 true-color image from NASA's Terra satellite
Posted inNews

Invisible Wildfire Smoke Has Visible Health Impacts

by E. I. Garcia de Jesus 11 January 20195 January 2022

Wildfires in the Pacific Northwest were linked to upticks in respiratory problems in Colorado, a new study shows.

An NSF/NCAR research aircraft prepares for takeoff to Boise, Idaho, to study western wildfire smoke.
Posted inNews

UCAR to Keep Managing National Center for Atmospheric Research

by Randy Showstack 28 September 201826 October 2021

The head of the University Corporation for Atmospheric Research says he is excited about “taking our science to the next level.”

The SnowEx project’s first year addressed using remote sensing techniques to measure snow water content in forested areas.
Posted inScience Updates

How Can We Find Out How Much Snow Is in the World?

by E. Kim 1 June 20187 February 2023

In Colorado forests, NASA scientists and a multinational team of researchers test the limits of satellite remote sensing for measuring the water content of snow.

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AGU Advances
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By Sarah Kang

EDITORS' VOX
Reviews of Geophysics
“Rare and Revealing: Radiocarbon in Service of Paleoceanography”
By Luke C. Skinner and Edouard Bard

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