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タイトル: | A Statistical Analysis of the Energy Dissipation Rate Estimated From the PMWE Spectral Width in the Antarctic |
著者: | Kohma, M. Sato, K. Nishimura, K. Tsutsumi, M. Sato, T. |
著者名の別形: | 佐藤, 亨 |
キーワード: | PMWE turbulence VHF radar gravity wave |
発行日: | 27-Aug-2020 |
出版者: | American Geophysical Union (AGU) |
誌名: | Journal of Geophysical Research: Atmospheres |
巻: | 125 |
号: | 16 |
論文番号: | e2020JD032745 |
抄録: | The radar volume reflectivity and turbulent kinetic energy dissipation rate in the Antarctic mesosphere were estimated from the polar mesosphere winter echoes (PMWE) recorded using a vertical beam of the PANSY radar, a Mesosphere‐Stratosphere‐Troposphere radar at Syowa Station (69°S, 40°E), over a period of 4 years. The observed radar volume reflectivity exhibits a lognormal distribution in the range of 2 × 10−18 to 5 × 10−15 m−1 for a height region of 55–82 km. The turbulent energy dissipation rate estimated from the spectral widths of the PMWE ranges from 10−4 to 100 m2 s−3. From monthly histograms of the turbulent energy dissipation rate for a fixed solar zenith angle (SZA) and height, it was found that the summer‐to‐winter transition of the turbulent energy dissipation rate occurs in March, while the winter‐to‐summer transition occurs in September. This seasonal variation agrees well with that of gravity wave activity, suggesting that the turbulence in the mesosphere is likely caused by gravity wave breaking. |
著作権等: | © 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/261743 |
DOI(出版社版): | 10.1029/2020jd032745 |
出現コレクション: | 学術雑誌掲載論文等 |
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