Winter is here, snow is falling in many areas of the country, and some of us are already wishing for the return of hot summer days. But, would you believe that even on the hottest summer day the temperature inside some clouds remains icy and winter-like, producing temperature readings as cold as negative 70 degrees Celsius (negative 94 degrees Fahrenheit)? Would you also believe that the ice crystals that form at the top of big summertime clouds may help scientists predict next winters snowstorm?
Known to interrupt hot summer afternoons with almost daily thunderstorms, convective cloud systems are very common in Florida. This image shows the unique shape of these systems, often called an "anvil" because of their potential to grow quite wide at the top and bottom, remaining narrow in the middle. Image credit: NOAA
Clouds, particularly the high thin cirrus clouds, play a major role in the balance of (reflecting and absorbing) solar energy between the Earth and space. Scientists are trying to find out more about the ice crystals within the cirrus clouds and what role they play in this balance. Image credit: NASA
Last month, scientists from NASAs Langley Research Center in Hampton, Va. and Goddard Space Flight Center in Greenbelt, Md. published a paper in the Journal of Geophysical Research on the importance of classifying ice crystals within the big summertime clouds, or convective cloud systems, as observed during a Florida-based research campaign. In their paper, the scientists showed that their instruments can identify the ice crystals and now they can begin to classify the crystals. By learning to classify the ice crystals in clouds, these scientists hope to contribute to improving weather and climate models, the complex computer programs used to show future atmospheric conditions.
Weather and climate computer models are complex because they must account for hundreds of variables, including many that seem completely unpredictable. Vincent Noel, a research scientist with Analytical Services and Materials at NASA Langley and the author of the journal article, explains, "Usually climate prediction means predicting the evolution of temperature, pressure, relative humidity, and plenty of other variables, over small (a few days) and large (a few centuries) timeframes. However, to predict all this stuff with enough accuracy, we need to take into account clouds -- and for the time being, clouds are the most important source of uncertainty in climate prediction."
Katie Lorentz | EurekAlert!
Water - as the underlying driver of the Earth’s carbon cycle
17.01.2017 | Max-Planck-Institut für Biogeochemie
Modeling magma to find copper
13.01.2017 | Université de Genève
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...
Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.
The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...
UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration
"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...
10.01.2017 | Event News
09.01.2017 | Event News
05.01.2017 | Event News
17.01.2017 | Earth Sciences
17.01.2017 | Machine Engineering
17.01.2017 | Physics and Astronomy