Observations of microscale internal gravity waves in very stable atmospheric boundary layers over an orchard canopy

Mayor, Satyajit

doi:10.1016/j.agrformet.2017.05.014

Cited by 14 publications

(7 citation statements)

References 48 publications

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“…However, during the nocturnal conditions, convective turbulence is suppressed with the negative buoyancy flux, resulting from the surface cooling rate. Therefore, the scale of coherent structures in the stably stratified Martian PBL (hereafter SBL) is much smaller compared to the daytime PBL, similar to the terrestrial case (Mason & Derbyshire, 1990; Mayor, 2017).…”

Section: Diurnal Variations Of Turbulence As Observed By the Insight ...mentioning

confidence: 99%

Spectral Analysis of the Martian Atmospheric Turbulence: InSight Observations

Temel

Senel

Spiga

et al. 2022

Geophysical Research Letters

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Section: Diurnal Variations Of Turbulence As Observed By the Insight ...mentioning

confidence: 99%

Spectral Analysis of the Martian Atmospheric Turbulence: InSight Observations

Temel

Senel

Spiga

et al. 2022

Geophysical Research Letters

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“…The wavelength is ∼70 m. The range‐corrected backscatter intensity was high‐pass median filtered to reveal the wave pattern. Brighter colors represent higher backscatter intensity [after Mayor et al , ; Jachens and Mayor , ].…”

Section: Observations Of Waves and Wave‐turbulence Interactionsmentioning

confidence: 99%

Review of wave‐turbulence interactions in the stable atmospheric boundary layer

Sun

Nappo²,

Mahrt

et al. 2015

Reviews of Geophysics

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137

124

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Flow in a stably stratified environment is characterized by anisotropic and intermittent turbulence and wavelike motions of varying amplitudes and periods. Understanding turbulence intermittency and wave-turbulence interactions in a stably stratified flow remains a challenging issue in geosciences including planetary atmospheres and oceans. The stable atmospheric boundary layer (SABL) commonly occurs when the ground surface is cooled by longwave radiation emission such as at night over land surfaces, or even daytime over snow and ice surfaces, and when warm air is advected over cold surfaces. Intermittent turbulence intensification in the SABL impacts human activities and weather variability, yet it cannot be generated in state-of-the-art numerical forecast models. This failure is mainly due to a lack of understanding of the physical mechanisms for seemingly random turbulence generation in a stably stratified flow, in which wave-turbulence interaction is a potential mechanism for turbulence intermittency. A workshop on wave-turbulence interactions in the SABL addressed the current understanding and challenges of wave-turbulence interactions and the role of wavelike motions in contributing to anisotropic and intermittent turbulence from the perspectives of theory, observations, and numerical parameterization. There have been a number of reviews on waves, and a few on turbulence in stably stratified flows, but not much on wave-turbulence interactions. This review focuses on the nocturnal SABL; however, the discussions here on intermittent turbulence and wave-turbulence interactions in stably stratified flows underscore important issues in stably stratified geophysical dynamics in general.

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“…Horizontal structures of wavelike motions in ABL can be detected by airborne lidar (Chouza et al, 2016;Witschas et al, 2017) and ground-based lidar with range height indicator (RHI) scans (Poulos et al, 2002;Wang, 2013) or plan position indicator (PPI) scans (Mayor, 2017). GW parameters, such as horizontal phase speed, horizontal wavelength, propagation direction, intrinsic frequency, can be resolved from these measurements.…”

Section: Discussionmentioning

confidence: 99%

“…Numerous instruments have been utilized to detect wave motions in the ABL. Fixed point measurements on a tower or surface (Einaudi and Finnigan, 1981;Finnigan and Einaudi, 1981;Poulos et al, 2002;Sun et al, 2015a;Sun et al, 2004), insitu measurements on mobile platform such as balloon (Corby, 1957), aircraft Kuettner et al, 2007), remote sensing measurements such as sodar (Beran et al, 1973;Hooke and Jones, 1986;Lyulyukin et al, 2015), radar (Cohn et al, 1997;Cohn et al, 2001) and lidar (Chouza et al, 2016;Mayor, 2017;Neiman et al, 1988;Newsom and Banta, 2003;Poulos et al, 2002;Witschas et al, 2017) are widely used in recent decades. All these techniques are sensitive to only a certain portion of the wave spectra and wave characteristics, given a limited spatial and temporal range.…”

Section: Introductionmentioning

confidence: 99%

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

Jia¹,

Yuan²,

Wang³

et al. 2019

Preprint

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Abstract. A long-live gravity wave (GW) in atmospheric boundary layer (ABL) during a field experiment in Anqing, China (116&#176;58&#8242;&#8201;E, 30&#176;37&#8242;&#8201;N) is analysed. Persistent GWs over 10 hours with periods ranging from 10 to 30&#8201;min in the ABL within 2&#8201;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&#8201;m&#8201;s&#8722;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 ~&#8201;5&#8201;m&#8201;s&#8722;1 exists at the altitude of 1~2&#8201;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.

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Observations of microscale internal gravity waves in very stable atmospheric boundary layers over an orchard canopy

Cited by 14 publications

References 48 publications

Spectral Analysis of the Martian Atmospheric Turbulence: InSight Observations

Spectral Analysis of the Martian Atmospheric Turbulence: InSight Observations

Review of wave‐turbulence interactions in the stable atmospheric boundary layer

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

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