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!
GPM sees deadly tornadic storms moving through US Southeast
01.12.2016 | NASA/Goddard Space Flight Center
Cyclic change within magma reservoirs significantly affects the explosivity of volcanic eruptions
30.11.2016 | Johannes Gutenberg-Universität Mainz
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...
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...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water
In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...
The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
02.12.2016 | Medical Engineering
02.12.2016 | Agricultural and Forestry Science
02.12.2016 | Physics and Astronomy