Observation of low-level wind reversals in the Gulf of Lion area and their impact on the water vapour distribution and variability - INSU - Institut national des sciences de l'Univers
Communication Dans Un Congrès Année : 2015

Observation of low-level wind reversals in the Gulf of Lion area and their impact on the water vapour distribution and variability

Résumé

Water vapour measurements from a ground-based Raman lidar and an airborne differentialabsorption lidar, complemented by high resolution numerical simulations from twomesoscale models (AROME-WMED and Meso-NH), have been considered to investigatethree transition events from Mistral/Tramontane to southerly marine flow taking place inthe Gulf of Lion area in the time frame September-October 2012, during the HydrologicalCycle in the Mediterranean Experiment Special Observation Period 1. Low-level windreversals associated with these transitions are found to have a strong impact on watervapour transport, leading to a large variability of the water vapour vertical and horizontaldistributions. The high spatial and temporal resolutions of the lidar data allow monitoringthe time evolution of the three-dimensional water vapour field during these transitions frompredominantly northerly Mistral/Tramontane flow to a predominantly southerly flow,permitting to identify the quite sharp separation between these flows, which is also wellcaptured by the mesoscale models. Water vapour measurements from the ground-basedlidar are complemented by particle backscatter measurements from the same system, whichallow also revealing the significant variability in the aerosol and cloud fields associated withthese transition events. Results will be illustrated and discussed at the Conference.
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Dates et versions

insu-01206611 , version 1 (01-10-2015)

Identifiants

  • HAL Id : insu-01206611 , version 1

Citer

Paolo Di Girolamo, Cyrille Flamant, Marco Cacciani, Evelyne Richard, Véronique Ducrocq, et al.. Observation of low-level wind reversals in the Gulf of Lion area and their impact on the water vapour distribution and variability. 9th HyMex Workshop, Sep 2015, Mykonos, Greece. ⟨insu-01206611⟩
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