Helios and Juliette: Two falsely acclaimed medicanes? - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Atmospheric Research Année : 2024

Helios and Juliette: Two falsely acclaimed medicanes?

Leo Pio d'Adderio
  • Fonction : Auteur
Giulia Panegrossi
  • Fonction : Auteur
Stavros Dafis
  • Fonction : Auteur
Daniele Casella
  • Fonction : Auteur
Paolo Sanò
  • Fonction : Auteur
Alessandro Fuccello
  • Fonction : Auteur
Mario Marcello Miglietta
  • Fonction : Auteur

Résumé

The present work analyzes the synoptic, thermodynamic, and microphysics characteristics of two Mediterranean cyclones that occurred in February-March 2023. The analysis is mainly carried out through the use of passive microwave (PMW) satellite measurements, which allow us to follow the cyclones' evolution and state whether Helios and Juliette can be considered as Mediterranean tropical-like cyclones (i.e., medicanes). Both cyclones show a very similar evolution, with a low-stratospheric warm air anomaly during the development phase, followed by the development of a warm anomaly in the low-/mid-troposphere. This feature is often observed in medicanes (e.g., Qendresa, Zorbas), except for few cases (i.e., Medicane Ianos, which shows a warm core (WC) development clearly driven by diabatic processes without a preliminary warming signal in the lower stratosphere and upper troposphere). The analysis carried out highlights that, while Helios maintains this setting through its whole lifetime, Juliette undergoes tropical transition in the final stage of its evolution. As opposed to most medicane cases, the PMW precipitation microphysics diagnostics shows the predominance of shallow clouds, with almost total absence of ice hydrometeors and deep convection in the proximity of the WC center (i.e., within 100 km radius) for Helios and during the initial stage of Juliette. PMW radiometry provides strong indication that diabatic heating plays a role in the WC development when the onset of deep convection features is identified in the proximity of the Juliette cyclone center. Moreover, the PMW cloud-top height product does not show a closed cloud-free eye for Helios, while it is observed for the final stage of Juliette as often happens during medicanes' mature phase. Therefore, we deem that while Helios can be labeled as a warm seclusion, Juliette can be included in the tropical-like cyclone category.
Fichier principal
Vignette du fichier
1-s2.0-S0169809523005768-main.pdf (24.47 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification

Dates et versions

insu-04472079 , version 1 (22-02-2024)

Identifiants

Citer

Leo Pio d'Adderio, Giulia Panegrossi, Stavros Dafis, Jean-Francois Rysman, Daniele Casella, et al.. Helios and Juliette: Two falsely acclaimed medicanes?. Atmospheric Research, 2024, 299, ⟨10.1016/j.atmosres.2023.107179⟩. ⟨insu-04472079⟩
20 Consultations
3 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More