Momentum Flux and Vertical Wind Power Spectral Characteristics in the Troposphere and Lower Stratosphere Over Andøya, Norway as Observed by MAARSY

Ghosh, Priyanka; Renkwitz, Toralf; Latteck, R.; Avsarkisov, Victor; Chau, Jorge L.

doi:10.1029/2022gl101524

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…The amplitudes of the tropospheric momentum fluxes are stronger than that in the stratosphere and the strongest amplitudes appear in winter and summer (not shown). The dominant directions of the vertical momentum fluxes are not in a particular direction in the troposphere over the Tibetan Plateau, which is different from the momentum flux over Andøya, Norway (Ghosh et al, 2023).…”

Section: Vertical Momentum Flux Featuresmentioning

confidence: 73%

Seasonal variations of gravity‐wave parameters over the northern and southern Tibetan plateau radiosonde observatory

Qian,

Wei,

Liu

et al. 2024

Quart J Royal Meteoro Soc

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Seasonal variations of gravity wave parameters over the northern and southern Tibetan Plateau are studied using high vertical‐resolution L‐band radiosonde data during 2014–2019. The wave parameters include wavelength, frequency, phase speed, group velocity, perturbation energies and momentum fluxes. The synoptic effects on the gravity wave parameters are discussed with the Pearson correlation.It is found that the tropospheric vertical wavelengths as estimated from the zonal wind perturbation show a pronounced decrease over the southern Tibetan Plateau in the warm season. The tropospheric (stratospheric) horizontal wavelength is shortest (longest) in summer, and the stratospheric horizontal wavelength is longer than the tropospheric horizontal wavelength. The ratio of the intrinsic frequency to the Coriolis parameter is 2.5 ~ 5 (2 ~ 4.5) with a summer (winter) maximum in the troposphere (lower stratosphere). The ratio is generally higher in the north than in the south.The typical value of the mean tropospheric (stratospheric) intrinsic phase speed is 3.5 ~ 6 (2 ~ 11) ms‐1. The mean intrinsic phase speed in the south is mostly larger than that in the north. The tropospheric zonal ground‐based group velocities is dominantly eastward in all seasons. The stratospheric zonal ground‐based group velocity shifts from eastward in summer to westward in winter.In the troposphere, the seasonal cycles of the kinetic energy (KE) and potential energy (PE) exhibit regional differences. The tropospheric vertical fluctuation energy (VE) is independent of both season and region. The stratospheric KE, PE and VE are smaller in the warm season. The negative zonal momentum flux and positive meridional momentum flux are strongest in winter and summer.This article is protected by copyright. All rights reserved.

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Section: Vertical Momentum Flux Featuresmentioning

confidence: 73%

Seasonal variations of gravity‐wave parameters over the northern and southern Tibetan plateau radiosonde observatory

Qian,

Wei,

Liu

et al. 2024

Quart J Royal Meteoro Soc

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Intermittency of Waves in the Polar Upper Troposphere and Lower Stratosphere Over Northern Norway Using MAARSY

Ghosh,

Renkwitz,

Holt

et al. 2024

JGR Atmospheres

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We investigate the absolute momentum flux (AMF) and vertical wind variance of gravity waves (GWs) along with intermittencies in the upper troposphere and lower stratosphere (UTLS) during 2017–2022 using the Middle Atmosphere Alomar Radar System at Andøya, Norway (69.30°N, 16.04°E). We categorized the AMF and into different period ranges (30 min–2 hr, 2–6 hr, 6–13 hr, 13 hr–1 day, and 30 min–1 day) to study the significance of short‐ and long‐period waves. The selection of these period bands was based on the boundary conditions of the available spectra: 30 min (Nyquist frequency), 13 hr (inertial period), and 1 day (based on our interest in maximum long‐period oscillations). Through the investigation of the AMF and , we wish to determine in detail the GW characteristics at northern polar latitudes. Furthermore, it is crucial to assess the intermittency as it considerably influences and alters the GW attributes. Our novel results indicate for both AMF and : (a) seasonal variation with minima during summer (May–September); (b) higher magnitude in the upper troposphere (<9.00 km) than the lower stratosphere; (c) short‐period components (30 min–2 hr, 2–6 hr) are more intermittent in the entire UTLS; and (d) the long‐period components (6–13 hr, 13 hr–1 day) demonstrate lower (higher) intermittency in the upper troposphere (lower stratosphere) in summer implying a plausible wave‐filtering mechanism.

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Momentum Flux and Vertical Wind Power Spectral Characteristics in the Troposphere and Lower Stratosphere Over Andøya, Norway as Observed by MAARSY

Cited by 2 publications

References 29 publications

Seasonal variations of gravity‐wave parameters over the northern and southern Tibetan plateau radiosonde observatory

Seasonal variations of gravity‐wave parameters over the northern and southern Tibetan plateau radiosonde observatory

Intermittency of Waves in the Polar Upper Troposphere and Lower Stratosphere Over Northern Norway Using MAARSY

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