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DOI | 10.1029/2018GL079934 |
Anomalous Behavior of Vertical Wavenumber Spectra Over a Tropical Station of India | |
Ghosh, Priyanka1; Ramkumar, T. K.2; Sharma, Som1 | |
2018-11-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:22页码:12553-12559 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | The vertical wavenumber (VWN) spectra of height profiles of winds over a tropical station of Gadanki (13.5 degrees N, 79.2 degrees E; obtained using Indian Mesosphere Stratosphere Troposphere radar) show distinct nature of VWN spectra, which do not match with the so-called universal wavenumber spectra. The universal wavenumber spectra have three distinct regions: unsaturated (having log-log slope of 2), saturated (having log-log slope of -3), and turbulence region (having log-log slope of -5/3). In present work, we report the presence of positive slope at the higher end of the VWN spectra indicating the presence of unsaturated gravity waves, a kind of which is not reported so far. Many negative slopes of the order of similar to-6, similar to-9, and similar to-12 are noticed at the end of the spectra beyond the turbulence region of the wavenumber spectra, which is also not reported in any previous studies up to now. Plain Language Summary The amplitudes of atmospheric gravity wave (GW) increase exponentially throughout their propagation from lower to higher atmosphere. Therefore, these GWs impart energy to the surroundings, while their power of wavenumber spectra and spectral slope gets saturated to preserve overall stability. The universal wavenumber spectra have three distinct regions: unsaturated (having log-log slope of 2), saturated (having log-log slope of -3), and turbulence region (having log-log slope of -5/3). In present work, we report the presence of positive slope at the higher end of the vertical wavenumber spectra indicating the presence of unsaturated GWs, a kind of which is not reported so far. Many negative slopes of the order of similar to-6, similar to-9, and similar to-12 are noticed at the end of the spectra beyond the turbulence region of the wavenumber spectra, which is also not reported in any previous studies up to now. |
英文关键词 | distinct vertical wavenumber spectra radar positive slope at the higher end of the vertical wavenumber spectra many negative slopes beyond turbulence region |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000453250000050 |
WOS关键词 | GRAVITY-WAVES ; MST RADAR ; LOWER STRATOSPHERE ; POWER SPECTRA ; TROPOSPHERE ; GADANKI ; TEMPERATURE ; VELOCITIES ; ATMOSPHERE |
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/27131 |
专题 | 气候变化 |
作者单位 | 1.Phys Res Lab, Ahmadabad, Gujarat, India; 2.Natl Atmospher Res Lab, Gadanki, India |
推荐引用方式 GB/T 7714 | Ghosh, Priyanka,Ramkumar, T. K.,Sharma, Som. Anomalous Behavior of Vertical Wavenumber Spectra Over a Tropical Station of India[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(22):12553-12559. |
APA | Ghosh, Priyanka,Ramkumar, T. K.,&Sharma, Som.(2018).Anomalous Behavior of Vertical Wavenumber Spectra Over a Tropical Station of India.GEOPHYSICAL RESEARCH LETTERS,45(22),12553-12559. |
MLA | Ghosh, Priyanka,et al."Anomalous Behavior of Vertical Wavenumber Spectra Over a Tropical Station of India".GEOPHYSICAL RESEARCH LETTERS 45.22(2018):12553-12559. |
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