Earth Getting Mysteriously Windier


28 Mar 2011

The world has gotten stormier over the past two decades—and the reason is a mystery, a new study says.

In the past 20 years, winds have picked up around 5 percent on average.

Extremely strong winds caused by storms have increased even faster, jumping 10 percent over 20 years, according to the new analysis of global satellite data.

The study, the first to look at wind speeds across such a large swath of the planet, bolsters some earlier findingsaccording to study leader Ian Young, of the Swinburne University of Technology in Melbourne, Australia.

“Some regional studies had found similar results, so we suspected there may be an increasing trend,” Young said.

(See “Extreme Ocean Storms on the Rise, Tremors Show.”)

Bat-Like Sonar Tracks Wind Speeds

With the development of satellite and radar technology, the planet’s temperature and rainfall have been tracked like never before.

Other aspects of the climate, however, haven’t gotten as much attention.

To create a record of wind measurements around the world, Young and colleagues assembled global satellite measurements dating back to 1985.

The team drew on records from satellites that used radar altimeters, which work similarly to bats’ echolocation, or natural radar.

The orbiting satellites shoot radio waves at Earth and listen for the echoes that bounce back into space.

When winds are blowing hard, the radar echoes are fainter, giving a measure of how strong the wind is blowing over the oceans.

Windy Trend Linked to Global Warming?

It’s not yet clear whether the windier trend is due to global warming, or if it’s part of a cyclical pattern, said Young, whose research appeared Friday in the journalScience.

(Also see “Extreme Storms and Floods Concretely Linked to Climate Change?”)

“If this is related to global warming—and this is speculation—it indicates that either the intensity of storms is increasing or the frequency of storms is increasing,” he said.

If the winds keep up, they could impact “engineering design of coastal and offshore structures, coastal erosion, and marine ecosystems.”

bookshelf

books I've read on failure & grace

The World Without Us
The Last Oil Shock: A Survival Guide to the Imminent Extinction of Petroleum Man
Zeitoun
A Paradise Built in Hell: The Extraordinary Communities That Arise in Disaster
Hell and High Water: Global Warming--the Solution and the Politics--and What We Should Do
The Worst Hard Time: The Untold Story of Those Who Survived the Great American Dust Bowl
The Tipping Point
Three Cups of Tea: One Man's Mission to Promote Peace... One School at a Time
The Upside of Down: Catastrophe, Creativity and the Renewal of Civilization
Out of Poverty: What Works When Traditional Approaches Fail
The Little Ice Age: How Climate Made History, 1300-1850
Confessions of an Eco-Sinner: Tracking Down the Sources of My Stuff
Deep Economy: The Wealth of Communities and the Durable Future
The Geography of Bliss: One Grump's Search for the Happiest Places in the World


Mason's favorite books »

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