Subscribe to our free daily newsletters
  Space Travel News  




Subscribe to our free daily newsletters



WOOD PILE
A new parameterization of canopy radiative transfer for land surface radiation models
by Staff Writers
Beijing, China (SPX) Apr 10, 2017


This is an illustration of canopy radiative transfer. Image courtesy Feng Zhang.

Among the physical processes of land surfaces, canopy radiative transfer is especially important. It plays a key role in controlling land-atmosphere flux exchanges by determining surface albedo and transpiration. However, the canopy varies geographically from that of dense tropical forests to the shrublands of arid desert lands, and temporally from the vibrancy of spring to the gloominess of winter. Uncertainties are abound in the processes of radiative transfer parameterization.

Dr Feng Zhang and his collaborators propose a new parameterization for the canopy phase function, which is based on the leaf normal distribution and leaf reflection/transmission, and examine the accuracy in reflection and transmission of the canopy through comparison with the benchmark result of SOSA. The findings are published in Advances in Atmospheric Sciences (Zhang et al., 2017).

"The new method," says Dr. Zhang, "when based on Eddington approximation, can substantially improve the accuracy compared to the previously preferred hemispheric constant method, under both isotropic and anisotropic conditions. Therefore, the canopy albedo can be evaluated more accurately by the analytical solution of non-zero soil background reflection."

Moreover, their investigation also reveals that there is a relationship between the direct radiation and the diffuse radiation of the canopy, which have been treated separately in previous studies. It is concluded that the new parameterization is well suited for applications of land surface radiation modeling.

Research paper

WOOD PILE
Stanford study explores risk of deforestation as agriculture expands in Africa
Stanford CA (SPX) Apr 10, 2017
Next time you bite into a chocolate bar, think of Africa. The continent produces nearly 70 percent of the world's cocoa, a growing output that requires carving more than 325,000 acres of new farmland from forests every year - a drop in the bucket of overall agricultural expansion there. That expansion is the subject of a new Stanford study that provides the first comprehensive assessment o ... read more

Related Links
Institute of Atmospheric Physics, Chinese Academy of Sciences
Forestry News - Global and Local News, Science and Application


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

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

WOOD PILE
WOOD PILE
New MAVEN findings reveal how Mars' atmosphere was lost to space

Potential Mars Airplane Resumes Flight

Prolific Mars Orbiter Completes 50,000 Orbits

Final two ExoMars landing sites chosen

WOOD PILE
How a young-looking lunar volcano hides its true age

Surviving the long dark night of the Moon

Team Indus To Send Seven Experiments To The Moon Including Three From India

Sun Devils working for a chance to induce photosynthesis on our lunar neighbor

WOOD PILE
Neptune's movement from the inner to the outer solar system was smooth and calm

Four unknown objects being investigated in Planet X

New Horizons Halfway from Pluto to Next Flyby Target

ANU leads public search for Planet X

WOOD PILE
Exoplanet mission gets ticket to ride

Inside Arctic ice lies a frozen rainforest of microorganisms

Astronomers confirm atmosphere around the super-Earth

TRAPPIST-1 flares threaten possibility of habitability on surrounding exoplanets

WOOD PILE
US Hardware Production Begins for Money-Saving Next-Generation Rockets

'Fuzzy' fibers can take rockets' heat

Flight Tests of Super-Heavy Angara-A5V Carrier Rocket May Start in 2027

Kremlin Believes Russia Can Compete With Private Firms Like SpaceX in Space

WOOD PILE
Yuanwang fleet to carry out 19 space tracking tasks in 2017

China Develops Spaceship Capable of Moon Landing

Long March-7 Y2 ready for launch of China's first cargo spacecraft

China Seeks Space Rockets Launched from Airplanes

WOOD PILE
Comet That Took a Century to Confirm Passes by Earth

Wrong-way asteroid plays 'chicken' with Jupiter

A Trojan in Retreat

ExoTerra to become first privately owned space company to fly to an asteroid




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






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news 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. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. 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