Gravity waves measurement and analysis based on a Rayleigh Doppler lidar

2018 ◽  
Vol 47 (9) ◽  
pp. 930002
Author(s):  
陈 冲 Chen Chong ◽  
孙东松 Sun Dongsong ◽  
陈廷娣 Chen Tingdi ◽  
韩於利 Han Yuli ◽  
赵若灿 Zhao Ruocan ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Doppler Lidar ◽  
Measurement And Analysis

scholarly journals Nocturnal Elevated Convection Initiation of the PECAN 4 July Hailstorm

2018 ◽  
Vol 146 (1) ◽  
pp. 243-262 ◽  
Author(s):  
J. W. Wilson ◽  
S. B. Trier ◽  
D. W. Reif ◽  
R. D. Roberts ◽  
T. M. Weckwerth
Keyword(s):  
Gravity Waves ◽  
University Of Wyoming ◽  
Cloud Base ◽  
Doppler Lidar ◽  
Convective Storms ◽  
Multiple Observations ◽  
Western Side ◽  
Convection Initiation ◽  
The University ◽  
Advance Knowledge

AbstractDuring the Plains Elevated Convection at Night (PECAN) experiment, an isolated hailstorm developed on the western side of the PECAN study area on the night of 3–4 July 2015. One of the objectives of PECAN was to advance knowledge of the processes and conditions leading to pristine nocturnal convection initiation (CI). This nocturnal hailstorm developed more than 160 km from any other convective storms and in the absence of any surface fronts or bores. The storm initiated within 110 km of the S-Pol radar; directly over a vertically pointing Doppler lidar; within 25 km of the University of Wyoming King Air flight track; within a network of nine sounding sites taking 2-hourly soundings; and near a mobile mesonet track. Importantly, even beyond 100 km in range, S-Pol observed the preconvection initiation cloud that was collocated with the satellite infrared cloud image and provided information on the evolution of cloud growth. The multiple observations of cloud base, thermodynamic stability, and direct updraft observations were used to determine that the updraft roots were elevated. Diagnostic analysis presented in the paper suggests that CI was aided by lower-tropospheric gravity waves occurring in an environment of weak but persistent mesoscale lifting.

scholarly journals Gravity waves observation of wind field in stratosphere based on a Rayleigh Doppler lidar

2016 ◽  
Vol 24 (6) ◽  
pp. A581 ◽  
Author(s):  
Ruocan Zhao ◽  
Xiankang Dou ◽  
Dongsong Sun ◽  
Xianghui Xue ◽  
Jun Zheng ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Wind Field ◽  
Doppler Lidar

Observational study of quasi-monochromatic gravity waves characteristics in mesopause region with sodium fluorescence Doppler lidar

2017 ◽  
Vol 46 (5) ◽  
pp. 506002
Author(s):  
王 博 Wang Bo ◽  
胡 雄 Hu Xiong ◽  
闫召爱 Yan Zhaoai ◽  
肖存英 Xiao Cunying ◽  
郭商勇 Guo Shangyong ◽  
...  
Keyword(s):  
Observational Study ◽  
Gravity Waves ◽  
Doppler Lidar ◽  
Mesopause Region

scholarly journals Long-lived high-frequency gravity waves in the atmospheric boundary layer: observations and simulations

2019 ◽  
Vol 19 (24) ◽  
pp. 15431-15446 ◽  
Author(s):  
Mingjiao Jia ◽  
Jinlong Yuan ◽  
Chong Wang ◽  
Haiyun Xia ◽  
Yunbin Wu ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Gravity Waves ◽  
Horizontal Wind ◽  
Doppler Lidar ◽  
Low Level ◽  
Coherent Doppler Lidar ◽  
Computational Fluid Dynamics Cfd ◽  
Phase Progression ◽  
Low Level Jet

Abstract. A long-lived gravity wave (GW) in the atmospheric boundary layer (ABL) is analysed during a field experiment in Anqing, China (30∘37′ N, 116∘58′ E). Persistent GWs with periods ranging from 10 to 30 min over 10 h in the ABL within a 2 km height are detected by a coherent Doppler lidar from 4 to 5 September 2018. The amplitudes of the vertical wind due to these GWs are approximately 0.15–0.2 m s−1. The lifetimes of these GWs are longer than 20 wave cycles. There is no apparent phase progression with altitude. The vertical and zonal perturbations in the GWs are 90∘ out of phase, with vertical perturbations generally leading to zonal ones. Based on experiments and simplified two-dimensional computational fluid dynamics (CFD) numerical simulations, a reasonable generation mechanism of this persistent wave is proposed. A westerly low-level jet of ∼5 m s−1 exists at an altitude of 1–2 km in the ABL. The wind shear around the low-level jet leads to wave generation under the condition of light horizontal wind. Furthermore, a combination of thermal and Doppler ducts occurs in the ABL. Thus, the ducted wave motions are trapped in the ABL and have long lifetimes.

Sign in / Sign up

Export Citation Format

Share Document