Intraseasonal Variation in the Mesosphere Observed by the Mengcheng Meteor Radar from 2015 to 2020

Author:

Tang Yihuan1,Hao Xiaojing2,Qiu Shican3ORCID,Cheng Wenhan45,Yang Chengyun5ORCID,Wu Jianfei5

Affiliation:

1. Institute of Deep Space Sciences, Deep Space Exploration Laboratory, Hefei 230026, China

2. National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China

3. Department of Geophysics, College of the Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China

4. College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China

5. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Abstract

The intraseasonal oscillations (30–100 days, ISO) in the MLT (mesosphere and lower thermosphere) horizontal wind are investigated based on observations from the Mengcheng meteor radar. There is a clear seasonal variation in ISO in the horizontal wind at 80 km, which is strongest during the winter and weakest during the summer. At 100 km, ISO occurs throughout most of the year except winter, and there are significant differences in periods and amplitudes from year to year. From 2015 to 2016, ISOs with periods of 40–60 days were present in the 100 km horizontal wind, whereas none were simultaneously observed in the 80 km horizontal wind. Cross wavelets were used to study the relationship between ISO in the MLT region and ISO in the lower atmosphere. Some of the ISO activity is linked to tropospheric tropical convective activity, but the ISO connections with that in tropospheric convection are not consistent in the upper mesosphere and in the lower thermosphere.

Funder

National Natural Science Foundation of China Grants

B-type Strategic Priority Program of the Chinese Academy of Sciences

State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS

China’s National Space Administration

Anhui Provincial Natural Science Foundation

Joint Open Fund of Mengcheng National Geophysical Observatory

National Key Laboratory of Electromagnetic Environment

Publisher

MDPI AG

Subject

Atmospheric Science,Environmental Science (miscellaneous)

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