Free Newsletters - Space News - Defense Alert - Environment Report - Energy Monitor
. 24/7 Space News .




WATER WORLD
LLNL scientists find precipitation, global warming link
by Anne M Stark for LLNL News
Livermore CA (SPX) Nov 13, 2013


Lawrence Livermore scientists have found that observed changes in global precipitation are directly affected by human activities.

The rain in Spain may lie mainly on the plain, but the location and intensity of that rain is changing not only in Spain but around the globe.

A new study by Lawrence Livermore National Laboratory scientists shows that observed changes in global (ocean and land) precipitation are directly affected by human activities and cannot be explained by natural variability alone. The research appears in the Nov. 11 online edition of the Proceedings of the National Academy of Sciences.

Emissions of heat-trapping and ozone-depleting gases affect the distribution of precipitation through two mechanisms. Increasing temperatures are expected to make wet regions wetter and dry regions drier (thermodynamic changes); and changes in atmospheric circulation patterns will push storm tracks and subtropical dry zones toward the poles.

"Both these changes are occurring simultaneously in global precipitation and this behavior cannot be explained by natural variability alone," said LLNL's lead author Kate Marvel. "External influences such as the increase in greenhouse gases are responsible for the changes."

The team compared climate model predications with the Global Precipitation Climatology Project's global observations, which span from 1979-2012, and found that natural variability (such as El Ninos and La Ninas) does not account for the changes in global precipitation patterns.

While natural fluctuations in climate can lead to either intensification or poleward shifts in precipitation, it is very rare for the two effects to occur together naturally.

"In combination, manmade increases in greenhouse gases and stratospheric ozone depletion are expected to lead to both an intensification and redistribution of global precipitation," said Celine Bonfils, the other LLNL author.

"The fact that we see both of these effects simultaneously in the observations is strong evidence that humans are affecting global precipitation."

Marvel and Bonfils identified a fingerprint pattern that characterizes the simultaneous response of precipitation location and intensity to external forcing.

"Most previous work has focused on either thermodynamic or dynamic changes in isolation. By looking at both, we were able to identify a pattern of precipitation change that fits with what is expected from human-caused climate change," Marvel said.

By focusing on the underlying mechanisms that drive changes in global precipitation and by restricting the analysis to the large scales where there is confidence in the models' ability to reproduce the current climate, "we have shown that the changes observed in the satellite era are externally forced and likely to be from man," Bonfils said.

.


Related Links
Lawrence Livermore National Laboratory
Water News - Science, Technology and Politics






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





WATER WORLD
Veolia reports sales slip, shares surge
Paris (AFP) Nov 07, 2013
French water and utilities giant Veolia reported results broadly in line with expectations on Thursday, with a 4.0-percent fall of sales in the first nine months of the year. But shares in the company shot up by 6.97 percent to 13.05 euros. The overall French market was up by 0.05 percent in morning trading. One broker who declined to be named said that although the results were lacklust ... read more


WATER WORLD
NASA's GRAIL Mission Puts a New Face on the Moon

Moon mission yields clues to face of 'man in the moon'

Shanghai-built lunar rover set for lunar landing

Crowdfunded Lunar Spacecraft Reaches Funding Milestone

WATER WORLD
India Mars mission back on track after engine glitch: scientists

Opportunity Maneuvering Around A Dune Field

ExoMars Lander Module Named Schiaparelli

Prolific NASA Mars Orbiter Passes Big Data Milestone

WATER WORLD
NASA says new deep space vehicle on time for 2014 test

NASA's Orion Sees Flawless Fairing Separation in Second Test

Lockheed Martin Team Tests Orion's Protective Panels

UCF Lands NASA-Funded Center, Linchpin for Future Space Missions

WATER WORLD
China shows off moon rover model before space launch

China providing space training

China launches experimental satellite Shijian-16

China Moon Rover A New Opportunity To Explore Our Nearest Neighbor

WATER WORLD
Russians take Olympic torch on historic spacewalk

Russia launches Sochi Olympic torch into space

Spaceflight Joins with NanoRacks to Deploy Satellites from the ISS

Crew Completes Preparations for Soyuz Move

WATER WORLD
ASTRA 5B lands in French Guiana for its upcoming Ariane 5 flight

Kazakhstan say Baikonur launch site may be open to Western countries

ESA Swarm launch postponed

Europe's fifth ATV for launch by Arianespace begins its pre-flight checkout at the Spaceport

WATER WORLD
NASA Kepler Results Usher in a New Era of Astronomy

Astronomers answer key question: How common are habitable planets?

One in five Sun-like stars may have Earth-like planets

Mystery World Baffles Astronomers

WATER WORLD
Wageningen UR innovates in the ultra-low temperature freezing of research material

GOCE gives in to gravity

European science satellite to break up late Sunday

New chemistry: Drawing and writing in liquid with light




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement