Radiation fogs: WRF and LES numerical experiments

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Presentation transcript:

Radiation fogs: WRF and LES numerical experiments C. Román-Cascón, G-J. Steeneveld, C. Yagüe, M. Sastre, G. Maqueda European Meteorological Society 14th EMS / 10th ECAC 09 October 2014, Prague (CZ)

MOTIVATION & RESEARCH QUESTION WHAT IS HAPPENING HERE?

1. OBSERVATIONS 2. SIMULATIONS - WRF - LES OUTLINE 1. OBSERVATIONS 2. SIMULATIONS - WRF - LES CABAUW TOWER WRF-ARW v. 3.5.1 Dutch Atmospheric Large Eddy Simulation (DALES) v. 3.1

OBSERVATIONS CABAUW TOWER

General overview  (from visibility meas.) OBSERVATIONS General overview  (from visibility meas.) CABAUW TOWER FOG 6 hours PERSISTENT FOG - MORE THAN 2 DAYS 2011-11-20 1200 UTC MS2G SEVIRI Ch1. EUMETSAT http://www.sat.dundee.ac.uk/

OBSERVATIONS Wind speed FOG Height (m) Time (dec day) m/s

OBSERVATIONS TKE FOG Height (m) Time (dec day) m2/s2

OBSERVATIONS TKE Height (m) Time (dec day) Time (dec day)

WRF-ARW V3.5.1 CONFIGURATION Domain 1 domain (300 x 300 grid points) Horizontal resolution 2.5 km Vertical resolution 51 levels (8 levels <100 m) Boundary conditions ECMWF (pressure levels) Radiation Dudhia 1998 (SW), RRTM (LW) Microphysics WDM6-class PBL MYNN 2.5 Surface layer Monin-Obukhov scheme Land-surface Unified Noah Land use dataset USGS

LWC (g/kg) from VIS measurements (Kunkel, 1984) OBS - WRF LIQUID WATER CONTENT Height (m) LWC (g/kg) from VIS measurements (Kunkel, 1984) OBS g/kg Time (dec day) Height (m) WRF g/kg Time (dec day)

SW, T2, r2 OBS - WRF SW down (W/m2) Temp 2m (ºC) Specific Humidity 2m (g/kg) Time (dec day)

Friction velocity (m/s) OBS - WRF FRICTION VELOCITY (surface) Friction velocity (m/s) Time (dec day)

LES LES MATURE LES ONSET LES DISSIPATION

LWC LES OBS OBS- LES FOG – MATURE STAGE Height (m) Height (m) g/kg OBS Height (m) g/kg Time (UTC)

TKE OBS - LES FOG – MATURE STAGE LES Height (m) OBS Height (m) m2 / s2 OBS Height (m) Time (UTC) m2 / s2

CONCLUSIONS OBSERVATIONS - Fog thickness directly related with wind, u* or TKE. - Good mixing inside fog (TKE from 0.1 – 0.3 m2/s2) WRF - Good simulation of fog, BUT: - Not able to correctly reproduce the mixing events LES - INFRAESTIMATION of LWC (specially at the top) - LWC spread in the vertical  OVERESTIMATION of thickness - Able to reproduce mixing events as seen in observations (but too aggressive) - OVERESTIMATION of LWC  INFRAESTIMATION SW - OVERESTIMATION of U*  OVERESTIMATION of thickness

Thanks !! Děkuji !! carlosromancascon@ucm.es ... Radiation fogs: WRF & LES numerical experiments. carlosromancascon@ucm.es