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DOI | 10.1029/2019GL082155 |
Vertical Structure of Terdiurnal Tides in the Antarctic MLT Region: 15-Year Observation Over Syowa (69 degrees S, 39 degrees E) | |
Liu, Huixin1; Tsutsumi, Masaki2; Liu, Hanli3 | |
2019-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:5页码:2364-2371 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; USA |
英文摘要 | The terdiurnal tide (TDT) in the Antarctic mesosphere and lower thermosphere region is poorly known. This study examines TDT using neutral wind observations at Syowa during years of 2004-2018. TDT is found to be a significant tidal component with distinct vertical structures and seasonal evolution. (1) It shows a prominent height-dependent seasonal variation with phase reversal at 94 km. (2) The vertical wavelength in summer is similar to 40 km shorter than in winter. These features differ largely from those in the Arctic, indicating hemispheric asymmetry. The phase structure reveals a dominant upward propagating mode in local summer but superposition of more than one mode in other seasons. A downward propagating mode above 94 km in winter suggests Joule heating/ion drag as additional tidal sources to lower atmosphere ones. These results provide new constrains and benchmarks for model simulations that seek to understand terdiurnal tidal forcing mechanisms in polar regions. Plain Language Summary Terdiurnal tides in the Antarctica mesosphere and lower thermosphere region are poorly known. In this study, we examine its characteristics using long-term neutral wind observations at Syowa (69 degrees S, 39 degrees E) between January 2004 and July 2018. The analysis reveals terdiurnal tide being a significant tidal component in the Antarctica around solstices with distinct vertical structures. (1) Tides above 94 km has opposite climatological variation to that below 94 km. (2) The zonal and meridional wind components are 90 degrees phase shifted, with similar amplitude in most seasons. (3) The vertical wavelength is shorter in summer than in winter. Most of these features differ from those reported in the Arctic, indicating hemispheric asymmetry. Furthermore, the phase structure reveals a dominant upward propagating mode in local summer but superposition of more than one mode in other seasons. A downward propagating mode in winter above 95 km suggests Joule heating/ion drag as likely tidal sources from above, in addition to those from lower atmosphere. The nearly 15-year Syowa observations provide new constrains and benchmark for models that seek to understand terdiurnal tidal forcing mechanisms in polar regions. |
英文关键词 | atmospheric terdiurnal tides mesospheric dynamics in Antarctica Joule heating atmosphere vertical coupling |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462612900005 |
WOS关键词 | LOWER THERMOSPHERE ; GRAVITY-WAVES ; MESOSPHERE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/181595 |
专题 | 气候变化 |
作者单位 | 1.Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka, Fukuoka, Japan; 2.Natl Inst Polar Res, Tokyo, Japan; 3.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Liu, Huixin,Tsutsumi, Masaki,Liu, Hanli. Vertical Structure of Terdiurnal Tides in the Antarctic MLT Region: 15-Year Observation Over Syowa (69 degrees S, 39 degrees E)[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(5):2364-2371. |
APA | Liu, Huixin,Tsutsumi, Masaki,&Liu, Hanli.(2019).Vertical Structure of Terdiurnal Tides in the Antarctic MLT Region: 15-Year Observation Over Syowa (69 degrees S, 39 degrees E).GEOPHYSICAL RESEARCH LETTERS,46(5),2364-2371. |
MLA | Liu, Huixin,et al."Vertical Structure of Terdiurnal Tides in the Antarctic MLT Region: 15-Year Observation Over Syowa (69 degrees S, 39 degrees E)".GEOPHYSICAL RESEARCH LETTERS 46.5(2019):2364-2371. |
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