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DOI10.1175/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
ISSN0022-4928
EISSN1520-0469
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
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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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