Volume 38 Issue 4
Jul.  2018
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PAN Zhenhao, ZHOU Xiaoming, CHEN Gang, YAN Chunxiao, CHEN Feilong, WANG Ying. Abnormal Echoes in Lower Stratosphere Observed by Wuhan MST Radar during a Cold front Event[J]. Journal of Space Science, 2018, 38(4): 492-501. doi: 10.11728/cjss2018.04.492
Citation: PAN Zhenhao, ZHOU Xiaoming, CHEN Gang, YAN Chunxiao, CHEN Feilong, WANG Ying. Abnormal Echoes in Lower Stratosphere Observed by Wuhan MST Radar during a Cold front Event[J]. Journal of Space Science, 2018, 38(4): 492-501. doi: 10.11728/cjss2018.04.492

Abnormal Echoes in Lower Stratosphere Observed by Wuhan MST Radar during a Cold front Event

doi: 10.11728/cjss2018.04.492
  • Received Date: 2017-06-28
  • Rev Recd Date: 2017-11-29
  • Publish Date: 2018-07-15
  • Wuhan Mesosphere-Stratosphere-Troposphere (MST) radar is a radio atmosphere detection radar deployed by the Chinese Meridian Project. As the frequency is in VHF band, the echoes are sensitive in all their aspects. Such echo characteristics are much more obvious in the Upper Troposphere and Lower Stratosphere (UTLS), which provides a practical approach to investigate the atmosphere dynamics. Observations of echo characteristic during a cold front are obtained by Wuhan MST radar in mid-latitude in April 2016. The experiment results show that the typical feature of the echo aspect sensitivity is significantly changed compared with that of normal days. Reasons of the echo anomaly are studied by analyzing echo characteristics variations, wind field spatial distributions, turbulence generation mechanisms and Inertia Gravity Waves (IGWs) effects. The result demonstrates that the dissipating (or even breaking) of upward IGWs coming from convection system might feed the long-time persistence of Kelvin-Helmholtz (K-H) instability, which further tilts the horizontal reflection layer and results in the intense turbulence and the echo enhancement.

     

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