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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 03 Jun 2019

Research article | 03 Jun 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

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

Mingjiao Jia1,*, Jinlong Yuan1,2,*, Chong Wang1,2, Haiyun Xia1,2, Yunbin Wu2, Lijie Zhao2, Tianwen Wei2, Jianfei Wu2, Lu Wang2, Sheng-Yang Gu3, Liqun Liu4, Dachun Lu5, Rulong Chen5, Xianghui Xue2, and Xiankang Dou3 Mingjiao Jia et al.
  • 1Glory China Institute of Lidar Technology, Shanghai, 201315, China
  • 2CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, 230026, China
  • 3School of Electronic Information, Wuhan University, Wuhan, 430072, China
  • 4Anqing Meteorological Bureau, China Meteorological Administration, Anqing, 246001, China
  • 5Technical Support Centerfor Atmosphere Observation, Anhui Meteorological Administration, Hefei, 230031, China
  • *These authors contributed equally to this work.

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.

Mingjiao Jia et al.
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Simulated atmospheric gravity waves by CFD M. Jia and J. Yuan

Mingjiao Jia et al.
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Short summary
GWs with long lifetime over 20 wave cycles are detected in the atmospheric boundary layer (ABL) with a Doppler wind lidar. Experiments and CFD simulations lead to a conclusion that the GWs are excited by the wind shear of a low-level jet and then trapped in the ABL due to a combination of thermal and Doppler ducts.
GWs with long lifetime over 20 wave cycles are detected in the atmospheric boundary layer (ABL)...