Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Australian Land Surface Is Becoming More Like A Gardener’s Greenhouse

30.06.2004


Recent research has shown that over the past 50 years the evaporative demand at the terrestrial surface has decreased in many regions, while rainfall has remained constant or even increased a little, effectively making the land wetter. Much of the research to date has been undertaken in the Northern Hemisphere, but a new report details the changes specific to Australia between 1970 and 2002. Results are published this week in the International Journal of Climatology.



In the time period studied, rainfall in the various regions of Australia did not show a significant trend. However, the average pan evaporation showed a significant decrease similar to that previously noted in regions of the Northern Hemisphere. Thus, despite unvarying rainfall, the land surface of Australia has become less arid over the past three decades. One of the appreciable impacts of decreased pan evaporation in water-limited areas is less moisture deficit, possibly resulting in increased biological productivity and an increase in carbon uptake.

The change in pan evaporation that has now been noted in so many different regions is in direct contradiction to predictions made by the Intergovernmental Panel on Climate Change (IPCC). This group, as well as others, expected that as the average air temperature near the land surface increased, so would the potential evaporation. Marked increase in the vapour pressure, however, has resulted in near-constant air relative humidity near the surface and potential evaporation has not increased as predicted.


The authors Michael Roderick and Graham Farquhar do not yet know the cause of the change in pan evaporation rate. One possibility, not ruled out by this study, is the enhanced greenhouse effect. The authors use the analogy of a gardener’s ‘greenhouse’ to describe the warmer and effectively wetter terrestrial surface observed. Both authors believe that this development “highlights a need for reassessments of the ecological and hydrological impacts of climate change.”

Jaida Harris | alfa
Further information:
http://www.interscience.wiley.com

More articles from Earth Sciences:

nachricht Predicting unpredictability: Information theory offers new way to read ice cores
07.12.2016 | Santa Fe Institute

nachricht Sea ice hit record lows in November
07.12.2016 | University of Colorado at Boulder

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>