Detection of organized airflow in the atmospheric boundary layer and the free atmosphere using a 3D-scanning coherent Doppler lidar

2009 ◽  
Author(s):  
Y. Fujiyoshi ◽  
K. Yamashita ◽  
C. Fujiwara
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
3D Scanning ◽  
Doppler Lidar ◽  
Free Atmosphere ◽  
Coherent Doppler Lidar

scholarly journals UAV-borne coherent doppler lidar for marine atmospheric boundary layer observations

2018 ◽  
Vol 176 ◽  
pp. 02012
Author(s):  
Songhua Wu ◽  
Qichao Wang ◽  
Bingyi Liu ◽  
Jintao Liu ◽  
Kailin Zhang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Motion Correction ◽  
Wind Profile ◽  
Layer Structure ◽  
Doppler Lidar ◽  
Marine Atmospheric Boundary Layer ◽  
Preliminary Results ◽  
Design Specifications ◽  
Coherent Doppler Lidar

A compact UAV-borne Coherent Doppler Lidar (UCDL) has been developed at the Ocean University of China for the observation of wind profile and boundary layer structure in Marine Atmospheric Boundary Layer (MABL). The design, specifications and motion-correction methodology of the UCDL are presented. Preliminary results of the first flight campaign in Hailing Island in December 2016 is discussed.

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.

scholarly journals Long-live High Frequency Gravity Wavesin Atmospheric Boundary Layer: Observations and Simulations

2019 ◽  
Author(s):  
Mingjiao Jia ◽  
Jinlong Yuan ◽  
Chong Wang ◽  
Haiyun Xia ◽  
Yunbin Wu ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Horizontal Wind ◽  
Doppler Lidar ◽  
Low Level ◽  
Coherent Doppler Lidar ◽  
Long Lifetime ◽  
Computational Fluid Dynamics Cfd ◽  
Phase Progression ◽  
Low Level Jet

Abstract. A long-live gravity wave (GW) in atmospheric boundary layer (ABL) during a field experiment in Anqing, China (116°58′ E, 30°37′ N) is analysed. Persistent GWs over 10 hours with periods ranging from 10 to 30 min in the ABL within 2 km height are detected by a coherent Doppler lidar from 4 to 5 in September 2018. The amplitudes of the vertical wind due to these GWs are about 0.15~0.2 m s−1. The lifetime of the GWs is more than 20 wave cycles. There is no apparent phase progression with altitude. The vertical and zonal perturbations of the GWs are apparent quadrature with vertical perturbations generally leading ahead of zonal ones. Based on experiments and simplified 2-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 the altitude of 1~2 km in the ABL. The wind shear around the low-level jet lead to the wave generation in 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 with long lifetime.

scholarly journals Lidar Estimates of the Anisotropy of Wind Turbulence in a Stable Atmospheric Boundary Layer

2019 ◽  
Vol 11 (18) ◽  
pp. 2115 ◽  
Author(s):  
Banakh ◽  
Smalikho
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Stream Line ◽  
Doppler Lidar ◽  
Anisotropy Coefficient ◽  
Stable Temperature ◽  
Coherent Doppler Lidar ◽  
Wind Turbulence ◽  
Stable Atmospheric Boundary Layer ◽  
Turbulence Parameters

In this paper, a method is proposed to estimate wind turbulence parameters using measurements recorded by a conically scanning coherent Doppler lidar with two different elevation angles. This methodology helps determine the anisotropy of the spatial correlation of wind velocity turbulent fluctuations. The proposed method was tested in a field experiment with a Stream Line lidar (Halo Photonics, Brockamin, Worcester, United Kingdom) under stable temperature stratification conditions in the atmospheric boundary layer. The results show that the studied anisotropy coefficient in a stable boundary layer may be up to three or larger.

Coherent Doppler Lidar Observations of Marine Atmospheric Boundary Layer Height in the Bohai and Yellow Sea

2015 ◽  
Vol 35 (s1) ◽  
pp. s101001 ◽  
Author(s):  
王东祥 Wang Dongxiang ◽  
宋小全 Song Xiaoquan ◽  
冯长中 Feng Changzhong ◽  
王希涛 Wang Xitao ◽  
吴松华 Wu Songhua
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Yellow Sea ◽  
Doppler Lidar ◽  
Marine Atmospheric Boundary Layer ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Coherent Doppler Lidar ◽  
Atmospheric Boundary Layer Height ◽  
Lidar Observations

scholarly journals Shipborne wind measurement and motion-induced error correction by coherent doppler lidar over yellow sea in 2014

2018 ◽  
Vol 176 ◽  
pp. 06014
Author(s):  
Xiaochun Zhai ◽  
Songhua Wu ◽  
Bingyi Liu ◽  
Xiaoquan Song
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Error Correction ◽  
Yellow Sea ◽  
Doppler Lidar ◽  
Marine Atmospheric Boundary Layer ◽  
Wind Measurement ◽  
Coherent Doppler Lidar ◽  
Wind Profiles ◽  
Correction System

Shipborne wind observations by the Coherent Doppler Lidar (CDL) during the 2014 Yellow Sea campaign are presented to study the structure of the Marine Atmospheric Boundary Layer (MABL). This paper gives an analysis of the correction for horizontal and vertical wind measurement, demonstrating that the combination of the CDL with the attitude correction system enables the retrieval of wind profiles in the MABL during both anchored and cruising measurement with satisfied statistical uncertainties.

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