Long-lived high-frequency gravity waves in the atmospheric boundary layer: observations and simulations
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Published:2019-12-17
Issue:24
Volume:19
Page:15431-15446
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Jia MingjiaoORCID, Yuan Jinlong, Wang Chong, Xia HaiyunORCID, Wu Yunbin, Zhao Lijie, Wei Tianwen, Wu JianfeiORCID, Wang Lu, Gu Sheng-Yang, Liu Liqun, Lu Dachun, Chen Rulong, Xue XianghuiORCID, Dou Xiankang
Abstract
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.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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