气候变化领域集成服务门户(CCPortal): Balloon-Borne Observations of Short Vertical Wavelength Gravity Waves and Interaction With QBO Winds

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DOI	10.1029/2020JD032779
	Balloon-Borne Observations of Short Vertical Wavelength Gravity Waves and Interaction With QBO Winds
	Vincent R.A.; Alexander M.J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:15
英文摘要	The quasi-biennial oscillation (QBO), a ubiquitous feature of the zonal mean zonal winds in the equatorial lower stratosphere, is forced by selective dissipation of atmospheric waves that range in periods from days to hours. However, QBO circulations in numerical models tend to be weak compared with observations, probably because of limited vertical resolution that cannot adequately resolve gravity waves and the height range over which they dissipate. Observations are required to help quantify wave effects. The passage of a superpressure balloon (SPB) near a radiosonde launch site in the equatorial Western Pacific during the transition from the eastward to westward phase of the QBO at 20 km permits a coordinated study of the intrinsic frequencies and vertical structures of two inertia-gravity wave packets with periods near 1 day and 3 days, respectively. Both waves have large horizontal wavelengths of about 970 and 5,500 km. The complementary nature of the observations provided information on their momentum fluxes and the evolution of the waves in the vertical. The near 1 day westward propagating wave has a critical level near 20 km, while the eastward propagating 3-day wave is able to propagate through to heights near 30 km before dissipation. Estimates of the forcing provided by the momentum flux convergence, taking into account the duration and scale of the forcing, suggests zonal force of about 0.3–0.4 m s−1 day−1 for the 1-day wave and about 0.4–0.6 m s−1 day−1 for the 3-day wave, which acts for several days. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	quasi-biennial oscillation; radiosonde profiling; super-pressure balloon measurements; tropical gravity waves
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185870
作者单位	Physics, School of Physical Sciences, University of Adelaide, Adelaide, SA, Australia; Northwest Research Associates, CoRA Office, Boulder, CO, United States
推荐引用方式 GB/T 7714	Vincent R.A.,Alexander M.J.. Balloon-Borne Observations of Short Vertical Wavelength Gravity Waves and Interaction With QBO Winds[J],2020,125(15).
APA	Vincent R.A.,&Alexander M.J..(2020).Balloon-Borne Observations of Short Vertical Wavelength Gravity Waves and Interaction With QBO Winds.Journal of Geophysical Research: Atmospheres,125(15).
MLA	Vincent R.A.,et al."Balloon-Borne Observations of Short Vertical Wavelength Gravity Waves and Interaction With QBO Winds".Journal of Geophysical Research: Atmospheres 125.15(2020).