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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Jul 2020

01 Jul 2020

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A revised version of this preprint is currently under review for the journal ACP.

Gravity Waves induced Wind Shears Derived from SABER Temperature Observations

Xiao Liu1,2, Jiyao Xu2,3, Jia Yue4,5, and Hanli Liu6 Xiao Liu et al.
  • 1Henan Engineering Laboratory for Big Data Statistical Analysis and Optimal Control, School of Mathematics and Information Sciences, Henan Normal University, Xinxiang, 453007, China
  • 2State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, 100190, China
  • 3School of Astronomy and Space Science, University of the Chinese Academy of Science, Beijing, 100049, China
  • 4Catholic University of America, Washington, DC 20064, USA
  • 5NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • 6High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80301, USA

Abstract. Large wind shears around the mesopause region play important roles in atmospheric neutral dynamics and ionospheric electrodynamics. Based on previous observations using sounding rockets, lidars, radars and model simulations, large shears are mainly attributed to gravity waves (GWs) and modulated by tides (Liu, 2017). Based on the dispersion and polarization relations of linear GWs and the SABER temperature data from 2002 to 2019, a method of deriving GW-induced wind shears is proposed. The zonal mean GW-induced shears have peaks (13–17 ms−1 km−1) at around the mesopause region, i.e., at z = 90–100 km at most latitudes and at z = 80–90 km around the cold summer mesopause. This latitude-height pattern is robust over the 18 years and coincides with model simulations. The magnitudes of the GW-induced shears exhibit year-to-year variations and coincide with the lidar and sounding rocket observations on climatology sense but are 60–70 % of the model results in the zonal mean sense. The GW-induced shears are hemispheric asymmetric and have strong annual oscillation (AO) at around 80 km (above 92 km) at the northern (southern) middle and high latitudes. At middle to high latitudes, the peaks of AO shift from winter to summer and then to winter again with increasing height. However, these GW-induced shears may be overestimated because the GW propagation direction cannot be resolved by the method and may be underestimated due to the observational filter, sampling distance and cutoff criterion of the vertical wavelength of GWs.

Xiao Liu et al.

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Xiao Liu et al.

Xiao Liu et al.


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Publications Copernicus
Short summary
Large wind shears in the mesosphere and lower thermosphere have been recognized as a common phenomenon. Simulation and ground-based observations have showed that the main contributor of Large wind shears is gravity waves. Along this line, we present a method of derive wind shears induced by gravity waves according to the linear theory and using the global temperature observations by the SABER instrument. Our results agree well with observations and model simulations.
Large wind shears in the mesosphere and lower thermosphere have been recognized as a common...