Direct Numerical Simulation of Breaking Atmospheric Gravity Waves

Remmler, Sebastian; Hickel, Stefan; Fruman, Mark D.; Achatz, Ulrich

doi:10.1007/978-3-319-10810-0_39

Cited by 1 publication

(1 citation statement)

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“…This wave lasted less than 10 wave cycles, approximately 2 h, with a period of ∼ 16 min. Román-Cascón et al (2015) analysed nonlocal GWs generated by wind shear or the low-level jet trapped within the stable ABL. With an acoustic echo sounder, similar wave motions were also observed without apparent phase progression with altitude in a stably stratified ABL several decades ago (Beran et al, 1973;Hooke and Jones, 1986).…”

Section: Casementioning

confidence: 99%

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

Jia¹,

Yuan

Wang

et al. 2019

Atmos. Chem. Phys.

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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.

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Section: Casementioning

confidence: 99%