Category Archives: Geoscience

Beyond the Shadow of a Drought: Southwest U.S. Megadrought Nears Certainty

A dry riverbed in California.
Photo courtesy National Oceanic and Atmospheric Administration.

The risk of a severe, multi-decade drought hitting the Southwest United States by the end of the century could reach as high as 99 percent if greenhouse gas emissions continue along current lines, says a paper by a team of scientists from Cornell University, Columbia University and NASA.

Read/listen to my full story at KJZZ’s Arizona Science Desk:
Worst Case: Megadrought Risk Near 99 Percent Under Current Greenhouse Emissions

Climate Change Expands Western U.S. Forest Fires — With Plenty of Help

Smoke from Arizona's Wallow Fire lends color to an Albuquerque, NM sunset. Photo by John Fowler.
Smoke from Arizona’s Wallow Fire lends color to an Albuquerque, NM sunset. Photo by John Fowler.

Human-induced climate change has doubled forest fire damage in the West over the past 30 years, says a study published online early by the journal PNAS. But human effects on fire extend far beyond climate.

Read/listen to my full story at KJZZ’s Arizona Science Desk:
As Western US Forest Fires Expand, Plenty Of Blame To Go Around

Spotting Fracking and Pumping Effects from Space

2011-2014 Hydraulic Fracturing Water Use (square meters/well)
Map by U. S. Geological Survey.

Using a technique called satellite radar interferometry, researchers have spotted millimeter-scale ground uplift surrounding four high-pressure injection wells near the eastern Texas city of Timpson. Two of the wells were located directly above a spate of record quakes that struck Timpson in 2012, topping out with a 4.8 magnitude quake on May 17. The other two were located within six miles of the quakes.

Read/listen to my full story at KJZZ’s Arizona Science Desk:
ASU Researcher: Satellite Radar Links Wastewater Pumping To Earthquakes

We’re Going to Need New Idioms for This: Record-Breaking Lightning

Cloud-to-cloud lighting.
Cloud-to-cloud lighting. Photo by Fir0002 / Flagstaffotos.

A 200-mile lightning flash and another flash lasting nearly eight seconds have redefined experts’ notions of what is possible for such events.

The new data prompted a World Meteorological Organization committee to recommend revising the definition of lightning discharges.

Read/listen to my full story at KJZZ’s Arizona Science Desk:
Record-Breaking Lightning Flashes Help Change Definition Of Lightning Events

Ice Volcano on Ceres

Scientists studying dwarf planet Ceres have found that a  13,000-foot volcano there arose not from silicic magma, but from muddy, salty ice that rose to the ~160 K surface and quick-froze like Smucker’s® Magic Shell.

Finding such a dramatic cryovolcanic process this close to the sun – in the inner asteroid belt between Mars and Jupiter – is unusual, and bolsters the idea that Ceres might have originated in the outer solar system. It also lends credence to the notion that asteroids and comets might be more closely related than once thought.

Read/listen to  my full story at KJZZ’s Arizona Science Desk:
13,000-Foot Mountain On Dwarf Planet Ceres May Be An Ice Volcano