A study of the vertical motion field near the high-latitude summer mesopause during MAC/SINE |
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| Institution: | 1. Geophysical Institute and Department of Physics, University of Alaska, Fairbanks, AK 99775-0800, U.S.A.;2. Norwegian Defence Research Establishment, N-2007 Kjeller, Norway;3. Max-Planck Institut für Aeronomie, D-3411 Katlenburg-Lindau, F.R.G.;1. Department of Pharmacology, School of Basic Medical Sciences, Shandong University, Jinan 250012, China;2. Department of Obstetrics, the Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China;3. The Key Laboratory of Infection and Immunity of Shandong Province, Department of Immunology, School of Basic Medical Sciences, Shandong University, Jinan 250012, China;4. The Key Laboratory of Experimental Teratology, Ministry of Education, Department of Molecular Medicine and Genetics, School of Basic Medical Sciences, Shandong University, Jinan 250012, China;5. Department of Urology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250012, China;6. School of Basic Medical Sciences, Shandong University, Jinan 250012, China;1. Department of Pharmacy, Sichuan Academy of Medical Science & Sichuan Provincial People''s Hospital, Personalized Drug Therapy Key Laboratory of Sichuan Province, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China;2. Department of Obstetrics and Gynecology, Sichuan Academy of Medical Science & Sichuan Provincial People''s Hospital, Chengdu, China;3. Miller School of Medicine, University of Miami, Florida, USA;1. College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210046, China;2. College of Preclinical Medical, Nanjing University of Chinese Medicine, Nanjing 210046, China;3. Changzhou Seventh People’s Hospital, Changzhou 213011, Jiangsu, China;1. Department of Analytical Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland;2. Department of Metrology and Optoelectronics and Advanced Materials Center, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland;3. Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland;4. Institute of Nanotechnology and Materials Engineering and Advanced Materials Center, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland;1. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China;2. Guangling College, Yangzhou University, Yangzhou 225009, China;3. School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China;4. School of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China |
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| Abstract: | We present the results of high-resolution observations of the vertical velocity field obtained with the EISCAT and SOUSY VHF radars near the high-latitude summer mesopause during the MAC/SINE campaign in northern Norway in 1987. The data reveal an energetic motion field with maximum amplitudes of ~ 10 m/s and characteristic periods of ~5–30 min. Motions exhibit a high degree of vertical coherence and a quasi-periodic structure, with typical durations of 5–10 cycles. Estimates of the mean vertical velocity are downward at lower levels and are near zero or positive at greater heights. The mean vertical velocity variance is found to be ~5 m2/s2, consistent with other high-latitude measurements. Frequency spectra computed for each radar are found to exhibit considerable variability, while vertical wavenumber spectra are seen to be somewhat variable in amplitude and to have slopes approaching ?3 at lower wavenumbers. These results are suggestive of an energetic spectrum of gravity wave motions near the mesopause that has a large vertical flux of wave energy, that may have observed wave frequencies differing significantly from intrinsic frequencies due to Doppler shifting by large horizontal winds, and that is consistent with the separability of the frequency and wavenumber dependence of the motion spectrum and with gravity wave saturation at sufficiently small vertical scales. |
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