Mesospheric temperature trends derived from ground-based LF phase-height observations at mid-latitudes: comparison with model simulations |
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| Institution: | 1. Key Laboratory of Electronic Equipment Structure Design, Ministry of Education, Xidian University, Xi''an, Shaanxi 710071, China;2. Center for Complex Systems, School of Mechano-electronic Engineering, Xidian University, Xi''an, Shaanxi 710071, China;3. School of Computing and Communications, InfoLab21, Lancaster University, Lancaster LA1 4YW, U.K;4. Philips Research, Eindhoven, 5656 AE Eindhoven, The Netherlands;1. Automation College, Nanjing University of Posts and Telecommunications, China;2. School of Mechatronic Engineering and Automation, Shanghai University, China;3. State Key Laboratory of Robotics, Chinese Academy of Sciences, China;1. School of Natural and Applied Sciences, Northwestern Polytechnical University, Xian, Shaanxi 710072, PR China;2. School of computer science and Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xian, Shaanxi 710072, PR China |
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| Abstract: | From indirect phase-height observations in the LF range at mid-latitudes, significant negative long-term trends of the ionospheric reflection height can be derived. The lowering of the reflection height at constant solar zenith angle can mainly be explained by a temperature decrease of the mesosphere due to increasing greenhouse gases (e.g. CO2) and a reduction of the atmospheric ozone content. Marked seasonal differences of the temperature trends could be found with a stronger cooling of the mesosphere in summer than in winter. A comparison of experimental trend results and model calculations with the three-dimensional global circulation model COMMA-IAP shows a reasonable agreement. |
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