Ocean Sci., 15, 179–198, 2019 https://doi.org/10.5194/os-15-179-2019 © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Dynamics of the North Balearic Front during an autumn tramontane and mistral storm: air–sea coupling processes and stratification budget diagnostic Léo Seyfried, Claude Estournel, Patrick Marsaleix, and Evelyne Richard Université de Toulouse, CNRS, UPS, Laboratoire d’Aérologie, Toulouse, France Correspondence: Léo Seyfried (
[email protected]) Received: 6 February 2018 – Discussion started: 20 February 2018 Revised: 22 December 2018 – Accepted: 18 January 2019 – Published: 1 March 2019 Abstract. The North Balearic Front forms the southern 1 Introduction branch of the cyclonic gyre in the northwestern Mediter- ranean Sea. Its dynamics exhibit significant seasonal vari- ability. During autumn, the front spreads northward during The surface circulation in the northwestern Mediterranean the calm wind periods and rapidly moves back southward Sea (NWMS) is formed by a cyclonic oceanic gyre (Fig.1). when it is exposed to strong northerly wind events such as This cyclonic gyre is closed to the north and west by the the tramontane and mistral. These strong winds considerably Northern Current (Millot, 1999) and to the east by the West enhance the air–sea exchanges. To investigate the role of air– Corsica Current (WCC) (Fig.1). The south branch of the sur- sea exchanges in the dynamics of the North Balearic front, face gyre is defined by a frontal zone, the so-called North we used observations and a high-resolution air–sea coupled Balearic Front (NBF).