La circulation atmosphérique dans le sud du Portugal et l'effet du réservoir d'alqueva. Cas d étude ALEX 2014
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1 8th Meso-NH user's meeting La circulation atmosphérique dans le sud du Portugal et l'effet du réservoir d'alqueva. Cas d étude ALEX 2014, Carlos Policarpo et Miguel Potes Instituto de Ciências da Terra (ICT) Universidade de Évora, Portugal 5 November 2015 Toulouse
2 ALEX2014 field campaign The ALqueva hydro-meteorological EXperiment, ALEX 2014 An integrated field campaign with measurements of chemical, physical and biological parameters around the Alqueva reservoir; With the purpose of studding the lake-atmosphere interactions From June to September and comprised a three days Intensive Observation Period (IOP) from 22 to 24 July.
3 Include: Meteorological and flux measurements Solar resource Water quality Chemical and phytoplankton composition Inwater solar attenuation Air quality - Atmospheric, aerosols and gases measurements Water vapour mapping through GPS network (IOP) Radiossondes with Meteorology and Atmospheric Electricity components (IOP) Night darkness Alqueva Region: Köppen classification: Csa Annual precipitation: 570 mm Number of days above 30ºC: 77.1
4 Eddy covariance measurements Energy fluxes (radiative and sensible and latent heat), CO2 and H2O over the reservoir 1m 2m Floating Platform in Alqueva
5 Weather stations near surface meteorological stations: temperature, humidity, wind, precipitation and pressure. 7 automatic weather stations were in place upwind and downwind
6 Intensive Observation Period IOP: 22, 23 and 24 of July 2014, during which: 18 meteorological balloons with meteorological radiosondes were launched. every 3 hours 2 daily radiosondes were launched in Lisbon (00 and 12 UTC (by IPMA)
7 ALEX 2014 Database
8 IOP Observed vertical structure 4 km Potential Temperature Altitude 3 km 1 km Characterization of the vertical structure and synoptic conditions Anticyclonic conditions Boundary layer well developed (more than 2500m deep in 1st day) Instable surface layer in the region (over land) with high values of sensible heat flux Near surface temperatures greater than 35ºC (1st day)
9 Setup of Meso-NH Simulations 4 km resolution, 300x250 gridpoints 2 Nested Domains & Orography MesoNH Version 4.93 ALEX IOP case: July 2014 Initialization and forcing: ECMWF 94 hours of simulation 54 vertical levels, concentrated in the BL 1 km resolution, 120X120 gridpoints
10 Numerical surface water fraction Alqueva water surface area: 250 km2
11 Validation against radiosondes - TEMP 22/7 12H 22/7 18H Temperature Profile 1st 5 km 23/7 3H - Good representation of the temperature during the day time, specially in the afternoon - up to 00 H - mixed boundary layer is well simulated 23/7 0H 23/7 15H - Not so good representation of the temperature profile at night and morning (00 to 09), specially in the first night. - Meso-NH too hot near surface 23/7 9H
12 Validation against radiosondes - RV 22/7 12H 22/7 18H 23/7 15H 24/7 18H Moisture Profile 1st 5 km - Good representation of the moisture during the day time, specially in the afternoon, - Meso-NH is drier - and do not show a decrease as abrupt as in the obs. - mixed boundary layer is well simulated 23/7 6H 24/7 6H - Meso-NH indeed too dry near surface during the night
13 22/07/ TU Simulation results: Examples 3km - RH 2m rv wind 50% 15% T2m 40ºC PBL Height 30ºC T2m 1km resolution domain
14 Time-height cross sections (Hovmoller) THETA Lake point Land point Hovmoller
15 Lake breeze 15 TU
16 Lake breeze 18 TU
17 Sea Breeze 21 TU
18 Observed lake breeze (FW days) BAR:10-12 UTC CID: UTC BAR:13-15 UTC CID: UTC
19 Conclusions ALEX 2014: A unique data-set of meteorological, hydrological and biological (water quality). 4 months (summer 2014) Meso-NH at 1 km resolution represents the evolution of the boundary layer structure and its evolution. In particular the IOP July 2014, well documented Useful for studies on lake-atmosphere interaction under Mediterranean climate. Underestimation of the humidity in the boundary layer Lake affects the boundary layer at a regional scale Sea breeze is clearly visible in observations and in simulations
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