Taxonomy term

rainfall

Swelling clay slows landslides

Rainfall can trigger landslides, and it can also cause slow-moving slides to speed up. But researchers have observed that rain also appears to cause landslides composed of clay-rich material to take longer to start moving, and to move slower than expected.

17 May 2018

End of ice age may have been too wet for megafauna

Between 15,000 and 11,000 years ago, dozens of ice-age megafauna species went extinct. Various causes, from climate-driven habitat changes to overhunting to extraterrestrial impacts, have been cited for these extinctions. But new research looking at fossils of large herbivores such as bison, horses and llama supports the idea that a worldwide uptick in moisture was a main driver of the extinction trend.

08 Sep 2017

Red Planet Roundup: August 2017

With two rovers patrolling the surface of Mars, six spacecraft orbiting above it, and scientists here on Earth studying the Red Planet from afar, new findings are announced often. Here are a few of the latest updates.

03 Aug 2017

Tropical rainfall shifts resulted in greener Sahara

Six thousand years ago, the Sahara — today the world’s largest nonpolar desert, stretching over an area larger than the contiguous United States — was dotted with lakes and vegetation. Rock paintings from that time depict a much wetter landscape, and show elephants, hippos, antelope and many other animals living in the region.

21 Apr 2017

Hurricane wrath may be reduced by rainfall

Meteorologists have gotten better and better at forecasting the paths of hurricanes and tropical storms, but predicting how intense a storm will be when it makes landfall has proved more difficult. Now, a new study offers a detailed look at how the energetic contributions of rain — once thought to be a trivial factor in such systems — can dramatically affect storm windspeeds and intensity.
 
14 Aug 2015

Rainwater penetrates into ductile crust

Rainwater is capable of percolating deeper into Earth’s crust than once thought possible, according to a new study. The finding could impact our understanding of mountain building, the behavior of rock deep underground and the formation of hydrothermal mineral deposits.

27 Dec 2014

Desert dust influences monsoon rains

India’s summer monsoons are stronger some years and weaker other years. This year-to-year variability dances around the mean by about 10 percent, but that difference can spell disaster in both arid and flood-prone regions. Pollutants and atmospheric circulation have long been blamed for wetter years and drier years, but now a new study has found that desert dust may also play a role.

17 Jul 2014

Blame it on the rain: The proposed links between severe storms and earthquakes

 

The U.S. Geological Survey’s website states it in no uncertain terms: “There is no such thing as ‘earthquake weather.’” Not too surprising, right? After all, how could the seemingly insignificant stresses imposed on the planet’s surface by mere weather instigate seismic shaking far underfoot?  Earthquakes and heavy rainstorms do occasionally produce comparable results on the planet’s surface, devastating landscapes and impacting humans, but it’s hard to imagine any more of a connection between such disparate phenomena. Yet, from at least the time of Aristotle, some people have professed links between atmospheric conditions and seismic shaking. And as the ability to record Earth’s rumblings has continued to improve, efforts to demonstrate such links scientifically have persisted into the present century.

23 Oct 2012

Raindrop study splashes old assumptions

Predicting the weather has been central to human civilization since the Babylonians started studying cloud patterns in 650 B.C. The key to weather predictions is making correct assumptions. Today, instruments like Doppler radar that measure rainfall work under the assumption that raindrops fall at their terminal velocity. A new study, however, shows that some raindrops fall faster than they should, indicating rainfall instruments — and by extension, weather forecasts — may need some tweaking.

23 Jul 2009