Preprints
https://doi.org/10.5194/egusphere-2024-495
https://doi.org/10.5194/egusphere-2024-495
26 Feb 2024
 | 26 Feb 2024

The Marinada Fall Wind in the Eastern Ebro Sub-basin: Physical Mechanisms and Role of the Sea, Orography and Irrigation

Tanguy Ronan Lunel, Maria Antonia Jimenez, Joan Cuxart, Daniel Martinez-Villagrasa, Aaron Anthony Boone, and Patrick Le Moigne

Abstract. During the warm months of the year in Catalonia, the sea-breeze overcomes the coastal mountain range and the marine air reaches the eastern Ebro sub-basin. This phenomenon is called Marinada and has recently been thoroughly characterized for the first time by Jimenez et. (2023), based on surface climatological data. However, the main physical mechanisms involved in its arrival and propagation remain to be discovered. This study aims to understand how the Marinada is formed and how it interacts with the already developed atmospheric boundary layer. Surface and atmospheric observations are used in combination with the coupled surface-atmosphere model Meso-NH to reveal the mechanisms at play. It is shown that the Marinada is generated by the advection of cool marine air mass over the Catalan Pre-coastal Range by the action of the sea breeze and the upslope wind. This marine air mass then flows into the Ebro basin, creating what is known as the Marinada. The characteristics and dynamics of the Marinada allow it to be classified as a fall wind. It is also shown that the arrival, propagation and decay of the Marinada is strongly dependent on the larger scale weather situation: westerlies or thermal low. The current study provides a consistent framework for understanding the Marinada, paving the way for better modelling and prediction of the phenomenon.

Tanguy Ronan Lunel, Maria Antonia Jimenez, Joan Cuxart, Daniel Martinez-Villagrasa, Aaron Anthony Boone, and Patrick Le Moigne

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  • RC1: 'Comment on egusphere-2024-495', Anonymous Referee #1, 01 Apr 2024
  • RC2: 'Comment on egusphere-2024-495', Anonymous Referee #2, 08 Apr 2024
Tanguy Ronan Lunel, Maria Antonia Jimenez, Joan Cuxart, Daniel Martinez-Villagrasa, Aaron Anthony Boone, and Patrick Le Moigne
Tanguy Ronan Lunel, Maria Antonia Jimenez, Joan Cuxart, Daniel Martinez-Villagrasa, Aaron Anthony Boone, and Patrick Le Moigne

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Short summary
During the summer in Catalonia, a cool wind, the Marinada, blows into the eastern Ebro basin in the afternoon. This study investigates its previously unclear dynamics using observations and a meteorological model. It is found to be driven by a cool marine air mass that flows over the mountains into the basin. The study shows how the sea breeze, upslope winds, larger weather patterns and irrigation play a prominent role in the formation and characteristics of the Marinada.