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DOI | 10.1175/JAS-D-19-0092.1 |
Vertical Modes and Effective Stability of Quasi-2-Day Waves | |
Sumi, Yukari1; Masunaga, Hirohiko2 | |
2019-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:7页码:2005-2022 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | A quasi-2-day wave is known as a convectively coupled westward inertia-gravity (WIG) wave with a shallower equivalent depth (or slower phase speed) than the dry counterpart. This study investigates the relationship between the phase speed of quasi-2-day waves and effective static stability in terms of a vertical mode perspective. By using WIG filters with different equivalent depths, different phases of the 2-day wave are identified by filtering brightness temperature data obtained from geostationary satellites. The composite time series and the vertical modes in the tropical atmosphere are calculated from reanalysis data. The large-scale dynamical fields of the composite WIG waves are explained by the superposition of the first four baroclinic modes. Phase speed of the moist vertical mode is computed by applying the Radon transform to the mode transform coefficient. Different vertical modes share a common phase speed, which is slower than its dry counterpart, implying that the wave is not dispersive. To address the question of what slows the vertical modes, the effective static stability is evaluated by defining the degree of cancellation between diabatic heating and adiabatic cooling due to the ascent. This cancellation is confirmed to be almost complete for the first baroclinic mode as expected theoretically. The effective static stability is found to be higher for a higher vertical mode, but this change over different vertical modes is not as rapid as predicted from nondispersiveness. Possible reasons for this disagreement are discussed herein. |
英文关键词 | Tropics Clouds Deep convection Dynamics Waves atmospheric |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000472925100001 |
WOS关键词 | COUPLED EQUATORIAL WAVES ; MADDEN-JULIAN OSCILLATION ; SCALE CLOUD DISTURBANCES ; GRAVITY-WAVES ; PART I ; STRATIFORM INSTABILITY ; KELVIN WAVES ; TROPICAL VARIABILITY ; ENERGY ; CIRCULATIONS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/184741 |
专题 | 地球科学 |
作者单位 | 1.Univ Tokyo, Grad Sch Sci, Tokyo, Japan; 2.Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan |
推荐引用方式 GB/T 7714 | Sumi, Yukari,Masunaga, Hirohiko. Vertical Modes and Effective Stability of Quasi-2-Day Waves[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(7):2005-2022. |
APA | Sumi, Yukari,&Masunaga, Hirohiko.(2019).Vertical Modes and Effective Stability of Quasi-2-Day Waves.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(7),2005-2022. |
MLA | Sumi, Yukari,et al."Vertical Modes and Effective Stability of Quasi-2-Day Waves".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.7(2019):2005-2022. |
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