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

Abstract We used the tropospheric and lower stratospheric 3D winds for four consecutive years (2017–2020) to study the momentum flux (MF) and vertical wind power spectra (VWP) over Andøya, Norway (69.30°N, 16.04°E) using the Middle Atmosphere Alomar Radar System. The spectra range from 3.5 days−1 &g...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Priyanka Ghosh, Toralf Renkwitz, Ralph Latteck, Victor Avsarkisov, Jorge L. Chau
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
atmospheric gravity waves
momentum flux
power spectra
kinetic energy
Geophysics. Cosmic physics
QC801-809
Andøya
Online Access:https://doi.org/10.1029/2022GL101524
https://doaj.org/article/783b5f54e2eb4f50b2f257e8dfc9aa9c
Description
Summary:Abstract We used the tropospheric and lower stratospheric 3D winds for four consecutive years (2017–2020) to study the momentum flux (MF) and vertical wind power spectra (VWP) over Andøya, Norway (69.30°N, 16.04°E) using the Middle Atmosphere Alomar Radar System. The spectra range from 3.5 days−1 > f > 30 min−1, which are categorized in terms of observed/ground‐based frequency (as the local inertial period is 13 h over Andøya), height ranges, and seasons. Our results indicate for the first time that (a) both the zonal and meridional MF display peaks around the inertial period (13 h) in the troposphere (1.80–12.00 km) during all seasons (with some exceptions), while VWP exhibits such features in the whole height range (1.80–18.00 km), (b) the minimum variability in MF, VWP, and kinetic energy is observed during summer, and (c) both the MF and VWP demonstrate height variation with maximum deviations below the tropopause.

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