Lidar Observations of Low-level Wind Reversals over the Gulf of Lion and Characterization of Their Impact on the Water Vapour Variability
1 Scuola di Ingegneria, Università degli Studi della Basilicata, Viale dell’Ateneo Lucano n. 10, 85100 Potenza – Italy,
2 Laboratoire Atmosphères, Milieux, Observations Spatiales, UMR 8190 CNRS &UPMC &UVSQ, Paris-France
3 Dipartimento di Fisica, Università di Roma “Sapienza”, Piazzale Aldo Moro, n. 2, 00100 Roma – Italy
4 Laboratoire d’Aérologie, UMR 5560 CNRS, Université de Toulouse, Toulouse, France
5 CNRM-GAME, UMR3589 Météo-France & CNRS, Toulouse, France
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Published online: 7 June 2016
Water vapour measurements from a ground-based Raman lidar and an airborne differential absorption lidar, complemented by high resolution numerical simulations from two mesoscale models (Arome-WMED and MESO-NH), are considered to investigate transition events from Mistral/Tramontane to southerly marine flow taking place over the Gulf of Lion in Southern France in the time frame September-October 2012, during the Hydrological Cycle in the Mediterranean Experiment (HyMeX) Special Observation Period 1 (SOP1). Low-level wind reversals associated with these transitions are found to have a strong impact on water vapour transport, leading to a large variability of the water vapour vertical and horizontal distribution. The high spatial and temporal resolution of the lidar data allow to monitor the time evolution of the three-dimensional water vapour field during these transitions from predominantly northerly Mistral/Tramontane flow to a predominantly southerly flow, allowing to identify the quite sharp separation between these flows, which is also quite well captured by the mesoscale models.
© Owned by the authors, published by EDP Sciences, 2016
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