Skip to Main content Skip to Navigation
Journal articles

Mistral and Tramontane wind speed and wind direction patterns in regional climate simulations

Abstract : The Mistral and Tramontane are important wind phenomena that occur over southern France and the northwestern Mediterranean Sea. Both winds travel through constricting valleys before flowing out towards the Mediterranean Sea. The Mistral and Tramontane are thus interesting phenomena, and represent an opportunity to study channeling effects, as well as the interactions between the atmosphere and land/ocean surfaces. This study investigates Mistral and Tramontane simulations using five regional climate models with grid spacing of about 50 km and smaller. All simulations are driven by ERA-Interim reanalysis data. Spatial patterns of surface wind, as well as wind development and error propagation along the wind tracks from inland France to offshore during Mistral and Tramontane events, are presented and discussed. To disentangle the results from large-scale error sources in Mistral and Tramontane simulations, only days with well simulated large-scale sea level pressure field patterns are evaluated. Comparisons with the observations show that the large-scale pressure patterns are well simulated by the considered models, but the orographic modifications to the wind systems are not well simulated by the coarse-grid simulations (with a grid spacing of about 50 km), and are reproduced slightly better by the higher resolution simulations. On days with Mistral and/or Tramontane events, most simulations underestimate (by 13 % on average) the wind speed over the Mediterranean Sea. This effect is strongest at the lateral borders of the main flow—the flow width is underestimated. All simulations of this study show a clockwise wind direction bias over the sea during Mistral and Tramontane events. Simulations with smaller grid spacing show smaller biases than their coarse-grid counterparts.
Complete list of metadata

Cited literature [53 references]  Display  Hide  Download
Contributor : Gestionnaire Hal-Upmc Connect in order to contact the contributor
Submitted on : Wednesday, March 16, 2016 - 3:16:43 PM
Last modification on : Friday, December 3, 2021 - 11:42:50 AM
Long-term archiving on: : Friday, June 17, 2016 - 10:40:48 AM


Publication funded by an institution


Distributed under a Creative Commons Attribution 4.0 International License



Anika Obermann, Sophie Bastin, Sophie Belamari, Dario Conte, Miguel Angel Gaertner, et al.. Mistral and Tramontane wind speed and wind direction patterns in regional climate simulations. Climate Dynamics, Springer Verlag, 2018, 51 (3), pp.1059-1076. ⟨10.1007/s00382-016-3053-3⟩. ⟨hal-01289330⟩



Les métriques sont temporairement indisponibles