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Chinese Journal of Space Science ›› 2017, Vol. 37 ›› Issue (4): 432-441.doi: 10.11728/cjss2017.04.432

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Quasi-16-day Planetary Waves during Sudden Stratospheric Warming Event

ZHU Lu1,2, JIANG Guoying1, XU Jiyao1, CHEN Jinsong1,2,3, HU Lianhuan4, NING Baiqi4   

  1. 1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    2. University of the Chinese Academy of Sciences, Beijing 100049;
    3. National Key Laboratory of Electromagnetic Environment, China Research Institute of Radio Wave Propagation, Qingdao 266107;
    4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
  • Received:2016-03-01 Revised:2016-05-27 Online:2017-07-15 Published:2017-07-20

Abstract:

A minor Sudden Stratospheric Warming (SSW) event occurred in the early and middle January of 2014. The amplitude of increasing temperature was about 25K, and the zonal eastward wind became weaker and shifted its direction until the early February. The Planetary Waves(PW)} play an important role in SSW events. Using the wind data detected by 5 meteor radars at low and middle latitude of northern hemisphere near 120°E, the PWs during this minor SSW event are studied. Results show that the enhanced quasi-16-day PW is found at Mesosphere and Lower Thermosphere (MLT) region. The enhancement of quasi-16-day waves was prior to the warming, and the quasi-16-day PW had mostly the strongest amplitude when the polar temperature reached its peak. This demonstrates the coupling between PW of low and middle latitude MLT region and SSW. Furthermore, using the reanalysis data from the European Center for Medium-range Weather Forecasts (ECMWF), the wave coupling between stratosphere and mesosphere is investigated. The band pass filtering result of the stratospheric temperature shows that quasi-16-day PW propagated from lower latitude to the pole, meanwhile the zero-wind line moved from low latitude to high latitude, The results indicate a dynamical connection between the 16-day PWs and SSW.

Key words: Quasi-16-day planetary waves, Sudden stratospheric warming of stratosphere, Mesosphere and Lower Thermosphere (MLT)

CLC Number: