High-frequency oscillations, with a period of approximately two hours, generally occur within the eyewall of tropical cyclones. These oscillations in turn induce oscillations of the tropical cyclone intensity through the oscillation of convection.
Associate Researcher Shumin CHEN, Professor Weibiao LI and their team, from the School of Atmospheric Sciences, Sun Yat-Sen University, simulated several tropical cyclones using mesoscale numerical models.
As detailed in their paper, recently published in Advances in Atmospheric Sciences, they found that periods of high-frequency oscillations of tropical cyclones in the South China Sea are significantly shorter than those in the open water of the western North Pacific.
They further examined the dynamic and thermodynamic characteristics of all the tropical cyclones. Associate Researcher Shumin CHEN explains their findings:
"We examined the environmental vorticity, divergence, thermal winds, and the convergence winds in the lower layer. We found that the general features were similar in tropical cyclones in the South China Sea and the open western North Pacific, except that the convergence within the lower layer of tropical cyclones in the South China Sea was significantly larger than that in the open western North Pacific. Convergence enhanced by greater terrain friction in the South China Sea strengthened the disturbance and then contributed to the shorter oscillation periods".
Professor Weibiao LI further explains that the study reveals the variations of high-frequency oscillation over different sea areas, and helps to improve the prediction of tropical cyclone intensity in different sea areas over the western North Pacific.
Zheng Lin | EurekAlert!
Wintertime Arctic sea ice growth slows long-term decline: NASA
07.12.2018 | NASA/Goddard Space Flight Center
Why Tehran Is Sinking Dangerously
06.12.2018 | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.
Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...
New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals
Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.
Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.
Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...
Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.
The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.
10.12.2018 | Event News
06.12.2018 | Event News
03.12.2018 | Event News
10.12.2018 | Physics and Astronomy
10.12.2018 | Life Sciences
10.12.2018 | Information Technology