Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. 24/7 Space News .




WATER WORLD
New technique measures evaporation globally
by Staff Writers
New York NY (SPX) Apr 17, 2013


Gentine and Salvucci plan to provide daily maps of evaporation around the world that will enable scientists to evaluate changes in water table, calculate water requirements for agriculture, and measure more accurate evaporation fluctuations into the atmosphere.

Researchers at Columbia Engineering and Boston University have developed the first method to map evaporation globally using weather stations, which will help scientists evaluate water resource management, assess recent trends of evaporation throughout the globe, and validate surface hydrologic models in various conditions. The study was published in the online Early Edition of Proceedings of the National Academy of Sciences (PNAS).

"This is the first time we've been able to map evaporation in a consistent way, using concrete measurements that are available around the world," says Pierre Gentine, assistant professor of earth and environmental engineering at Columbia.

"This is a big step forward in our understanding of how the water cycle impacts life on Earth."

The Earth's surface hydrologic cycle comprises precipitation, runoff, and evaporation fluctuations. Scientists can measure precipitation across the globe using rain gauges or microwave remote sensing devices. In places where streamflow measurements are available, they can also measure the runoff. But measuring evaporation has always been difficult.

"Global measurements of evaporation have been a longstanding and frustrating challenge for the hydrologic community," says Gentine. "And now, for the first time, we show that simple weather station measurements of air temperature and humidity can be used across the globe to obtain the daily evaporation."

Evaporation is a key component of the hydrological cycle: it tells us how much water leaves the soil and therefore how much should be left there for a broad range of applications such as agriculture, water resource management, and weather forecasting.

Gentine, who studies the relationship between hydrology and atmospheric science and its impact on climate change, collaborated on this research with Guido D. Salvucci, professor and chair of the Department of Earth and Environmental Sciences at Boston University and the paper's lead author.

Using data from weather stations, widely available across the globe, they focused on evaporation and discovered an emergent relationship between evaporation and relative humidity that gave them the evaporation rates.

Gentine and Salvucci plan to provide daily maps of evaporation around the world that will enable scientists to evaluate changes in water table, calculate water requirements for agriculture, and measure more accurate evaporation fluctuations into the atmosphere.

"Sharing our data with researchers around the world will help us learn more about the Earth's hydrologic cycle and assess recent trends such as whether it is accelerating," adds Gentine.

"Acceleration could greatly impact our climate, locally, nationally, and globally."

.


Related Links
Columbia University
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
Extreme Algae Blooms: The New Normal?
Washington DC (SPX) Apr 12, 2013
A 2011 record-breaking algae bloom in Lake Erie was triggered by long-term agricultural practices coupled with extreme precipitation, followed by weak lake circulation and warm temperatures, scientists have discovered. The researchers also predict that, unless agricultural policies change, the lake will continue to experience extreme blooms. "The factors that led to this explosion of ... read more


WATER WORLD
Characterizing The Lunar Radiation Environment

Russia rekindles Moon exploration program, intends setting up first human outposts there

Pre-existing mineralogy may survive lunar impacts

Lunar cycle determines hunting behaviour of nocturnal gulls

WATER WORLD
Accurate pointing by Curiosity

NASA Mars Orbiter Images May Show 1971 Soviet Lander

Opportunity is in position for solar conjunction at 'Cape York' on the rim of Endeavour Crater

NASA spacecraft may have spotted pieces of Soviet spacecraft on Mars

WATER WORLD
Testing Spacesuits in Antarctica, part 1

Obama's budget would boost science, health

Underwater for outer space

NASA Celebrates Four Decades of Plucky Pioneer 11

WATER WORLD
Shenzhou's Shadow Crew

Shenzhou 10 sent to launch site

China's Next Women Astronauts

Shenzhou 10 - Next Stop: Jiuquan

WATER WORLD
Mice "crew" of the Russian space satellite having troubles

UH Engineering Researcher's Theories to be Tested Aboard ISS

Unmanned Russian space freighter leaves space station toward fiery end

Europe sets June 5 for launch of space freighter

WATER WORLD
Launch pad problem scrubs launch of Antares rocket for NASA

ILS Proton Launches Anik G1 for Telesat

Ukraine aims to accelerate space industry development

Payload integration is underway for Vega's second mission from the Spaceport

WATER WORLD
Five-Planet System With Most Earth-Like Exoplanet Yet Found

New Techniques Allow Discovery Of Smallest Super-Earth Exoplanets

Kepler Finds Two Water Worlds 1200 Lights Years Away

Astronomers find most Earth-like planets yet

WATER WORLD
Softening steel problem expands computer model applications

New material gets itself into shape

For the very first time, two spacecraft will fly in formation with millimeter precision

High pressure gold nanocrystal structure revealed




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