Tropical Wave Observations From the Reel‐Down Atmospheric Temperature Sensor (RATS) in the Lowermost Stratosphere During Strateole‐2 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2023

Tropical Wave Observations From the Reel‐Down Atmospheric Temperature Sensor (RATS) in the Lowermost Stratosphere During Strateole‐2

Martina Bramberger
Doug Goetz
M. Joan Alexander
Lars Kalnajs

Résumé

Tropical waves play an important role in driving the quasi‐biennial oscillation of zonal winds in the tropical stratosphere. In our study we analyze these waves based on temperature observations from the 2021–2022 Strateole‐2 campaign when the Reel‐down Atmospheric Temperature Sensor (RATS) was successfully deployed for the first time. RATS provides long‐duration, continuous and simultaneous high‐resolution temperature observations at two altitudes (balloon float level and 200 m below) allowing for an analysis of vertical wavelengths. This separation distance was chosen to focus on waves near the resolution limit of reanalyses. Here, we found tropical waves with periods between about 6 hr and 2 days, with vertical wavelengths between 1.5 and 5 km, respectively. Comparing our results to Fifth generation European Centre for Medium‐Range Weather Forecasts (ERA5) reanalyses we found good agreement for waves with a period longer than 1 day. However, the ERA5 amplitudes of higher‐frequency waves are under‐estimated, and the temporal evolution of most wave packets differs from the observations.
Fichier principal
Vignette du fichier
RATS_paper_final.pdf (49.39 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04297087 , version 1 (21-11-2023)

Identifiants

Citer

Martina Bramberger, Doug Goetz, M. Joan Alexander, Lars Kalnajs, Albert Hertzog, et al.. Tropical Wave Observations From the Reel‐Down Atmospheric Temperature Sensor (RATS) in the Lowermost Stratosphere During Strateole‐2. Geophysical Research Letters, 2023, 50 (17), ⟨10.1029/2023GL104711⟩. ⟨hal-04297087⟩
8 Consultations
1 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More