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.
Jaida Harris | alfa
NASA looks to solar eclipse to help understand Earth's energy system
21.07.2017 | NASA/Goddard Space Flight Center
Scientists shed light on carbon's descent into the deep Earth
19.07.2017 | European Synchrotron Radiation Facility
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision
Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...
21.07.2017 | Event News
19.07.2017 | Event News
12.07.2017 | Event News
21.07.2017 | Earth Sciences
21.07.2017 | Power and Electrical Engineering
21.07.2017 | Physics and Astronomy