Thomas R. O'Donnell

Posts Tagged ‘American Geophysical Union’

Run, run reindeer: Climate change, other factors sap herd

In University research on December 21, 2016 at 2:27 pm
Reindeer on the run in Norway.

Reindeer on the run in Norway. Photo credit: zetson Running via photopin (license).

It was inevitable, given the timing, that Andrey Petrov’s latest research would get some unusual treatment.

At the Fall Meeting of the American Geophysical Union in San Francisco last week, Petrov presented a report showing that one of the world’s largest reindeer herds is contracting. After reaching a peak population of around a million in 2000, the pack has fallen to around 600,000 in the Taimyr Peninsula, its home territory and one Russia’s northernmost parts.

With Christmas just days away, some websites relayed the news with a tongue-in-cheek approach.

At Gizmodo, the headline was “400,000 Reindeer Vanish in Ongoing War on Christmas.”

LiveScience introduced its piece with “Santa’s Reindeer Feel the Heat as Numbers Shrink Worldwide.” The lead goes on with “Santa Claus better stock up on reindeer, because he may have trouble scrounging up replacements in the not-too-distant future, new research suggests,” before continuing with a serious and thorough report.

The BBC, meanwhile, played it straight.

I’ll admit: the Christmas time peg is one reason I’m also jumping on this study. But there are serious reasons and ramifications for the worldwide reindeer decline. Read the rest of this entry »

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Roughly speaking: How corn fields affect wind power production versus soybean fields

In University research on January 5, 2015 at 6:25 am
he corn beneath these MidAmerican Energy wind turbines near Blairsburg isn't yet quite as high as an elephant's eye. When the stalks reach maturity, their roughness can cut wind speed (and power production) at the turbine's hub, hundreds of feet up.

The corn beneath these MidAmerican Energy wind turbines near Blairsburg isn’t yet quite as high as an elephant’s eye. When the stalks reach maturity, their roughness can cut wind speed (and power production) at the turbine’s hub, hundreds of feet up. Credit: Todd Spink, National Renewable Energy Laboratory.

Charles Robinson rarely gives any thought to what he plants under the 3½ wind turbines (he shares one with a neighbor) on his farm near Greeley, in northeast Iowa’s Delaware County.

The giant windmills are a boon for him and dozens of other farmers in the state, providing an income stream from wind farm operators. With more than 3,000 turbines installed (PDF), Iowa is a national leader in renewable wind energy.

Like most Iowa farmers, Robinson plants a rotation of corn and soybeans. He never thought whether it was one or the other was relevant for the power the turbines produce. “The blades are so high, it wouldn’t bother anything,” he told me last week.

But Brian Vanderwende, a doctoral student in atmospheric and oceanic sciences at the University of Colorado, Boulder, and his adviser, Julie Lundquist, wondered: How do the crops planted below turbines influence the wind that spins their blades?

Last month, Vanderwende presented the surprising answer at the American Geophysical Union Fall Meeting in San Francisco.

Read the rest of this entry »

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