气候变化领域集成服务门户(CCPortal): A study of the dynamical characteristics of inertia-gravity waves in the Antarctic mesosphere combining the PANSY radar and a non-hydrostatic general circulation model

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DOI	10.5194/acp-19-3395-2019
	A study of the dynamical characteristics of inertia-gravity waves in the Antarctic mesosphere combining the PANSY radar and a non-hydrostatic general circulation model
	Shibuya R.; Sato K.
发表日期	2019
ISSN	16807316
起始页码	3395
结束页码	3415
卷号	19 期号:5
英文摘要	This study aims to examine the dynamical characteristics of gravity waves with relatively low frequency in the Antarctic mesosphere via the first long-term simulation using a high-top high-resolution non-hydrostatic general circulation model (NICAM). Successive runs lasting 7 days are performed using initial conditions from the MERRA reanalysis data with an overlap of 2 days between consecutive runs in the period from April to August in 2016. The data for the analyses were compiled from the last 5 days of each run. The simulated wind fields were closely compared to the MERRA reanalysis data and to the observational data collected by a complete PANSY (Program of the Antarctic Syowa MST/IS radar) radar system installed at Syowa Station (39.6° E, 69.0° S). It is shown that the NICAM mesospheric wind fields are realistic, even though the amplitudes of the wind disturbances appear to be larger than those from the radar observations. The power spectrum of the meridional wind fluctuations at a height of 70 km has an isolated and broad peak at frequencies slightly lower than the inertial frequency, f , for latitudes from 30 to 75° S, while another isolated peak is observed at frequencies of approximately 2π/8 h at latitudes from 78 to 90° S. The spectrum of the vertical fluxes of the zonal momentum also has an isolated peak at frequencies slightly lower than f at latitudes from 30 to 75° S at a height of 70 km. It is shown that these isolated peaks are primarily composed of gravity waves with horizontal wavelengths of more than 1000 km. The latitude-height structure of the momentum fluxes indicates that the isolated peaks at frequencies slightly lower than f originate from two branches of gravity wave propagation paths. It is thought that one branch originates from 75° S due to topographic gravity waves generated over the Antarctic Peninsula and its coast, while more than 80% of the other branch originates from 45° S and includes contributions by non-orographic gravity waves. The existence of isolated peaks in the high-latitude region in the mesosphere is likely explained by the poleward propagation of quasi-inertia-gravity waves and by the accumulation of wave energies near the inertial frequency at each latitude. © Author(s) 2019.
语种	英语
scopus关键词	general circulation model; gravity wave; inertia; mesosphere; radar; wave propagation; wind field; Antarctica
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144566
作者单位	Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Shibuya R.,Sato K.. A study of the dynamical characteristics of inertia-gravity waves in the Antarctic mesosphere combining the PANSY radar and a non-hydrostatic general circulation model[J],2019,19(5).
APA	Shibuya R.,&Sato K..(2019).A study of the dynamical characteristics of inertia-gravity waves in the Antarctic mesosphere combining the PANSY radar and a non-hydrostatic general circulation model.Atmospheric Chemistry and Physics,19(5).
MLA	Shibuya R.,et al."A study of the dynamical characteristics of inertia-gravity waves in the Antarctic mesosphere combining the PANSY radar and a non-hydrostatic general circulation model".Atmospheric Chemistry and Physics 19.5(2019).