气候变化领域集成服务门户(CCPortal): Evidence for Horizontal Blocking and Reflection of a Small-Scale Gravity Wave in the Mesosphere

CCPortal

DOI	10.1029/2019JD031828
	Evidence for Horizontal Blocking and Reflection of a Small-Scale Gravity Wave in the Mesosphere
	Criddle N.R.; Pautet P.-D.; Yuan T.; Heale C.; Snively J.; Zhao Y.; Taylor M.J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:10
英文摘要	The variations of the horizontal phase velocity of an internal gravity wave, generated by wave “blocking” or “reflection” due to an inhomogeneous wind field, have been predicted theoretically and numerically investigated but had yet to be captured experimentally. In this paper, through a collaborative observation campaign using a sodium (Na) Temperature/Wind lidar and a collocated Advanced Mesospheric Temperature Mapper (AMTM) at Utah State University (USU), we report the first potential evidence of such a unique gravity wave process. The study shows that a small-scale wave, captured by the AMTM, with initial observed horizontal phase velocity of 37 ± 5 m/s toward the northwest direction, experienced a large and increasing headwind as it was propagating in the AMTM field of view. This resulted in significant deceleration along its initial traveling direction, and it became quasi-stationary before it was “reflected” to the opposite direction at later time. The USU Na lidar measured the horizontal wind and temperature during the event, when the wave was found traveling within a temperature inversion layer and experiencing an increasing headwind relative to the wave. The wind agrees well with the expected value for wave blocking suggested by the wave tracing theory, implying the existence of a large horizontal wind gradient that night near the OH layer altitudes. The study indicates the critical role of horizontal winds and their horizontal gradients in determining propagation in vertical and horizontal directions. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	AMTM; gravity wave; mesosphere; Na lidar; wave blocking
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/186003
作者单位	Center for Atmospheric and Space Sciences, Utah State University, Logan, UT, United States; Physics Department, Utah State University, Logan, UT, United States; Center for Space and Atmospheric Research and Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL, United States
推荐引用方式 GB/T 7714	Criddle N.R.,Pautet P.-D.,Yuan T.,et al. Evidence for Horizontal Blocking and Reflection of a Small-Scale Gravity Wave in the Mesosphere[J],2020,125(10).
APA	Criddle N.R..,Pautet P.-D..,Yuan T..,Heale C..,Snively J..,...&Taylor M.J..(2020).Evidence for Horizontal Blocking and Reflection of a Small-Scale Gravity Wave in the Mesosphere.Journal of Geophysical Research: Atmospheres,125(10).
MLA	Criddle N.R.,et al."Evidence for Horizontal Blocking and Reflection of a Small-Scale Gravity Wave in the Mesosphere".Journal of Geophysical Research: Atmospheres 125.10(2020).