2011-2012 winter RADIATION FOGS at CIBA (Spain): Observations compared to WRF simulations using different PBL parameterizations Carlos Román-Cascón ([email protected]) Carlos Yagüe Mariano Sastre Gregorio Maqueda Universidad Complutense de Madrid EMS & ECAC 2012. Łódź, Poland 11th September 2012
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Carlos Román-Cascón ( [email protected] ) Carlos Yagüe Mariano Sastre Gregorio Maqueda
2011-2012 winter RADIATION FOGS at CIBA (Spain): Observations compared to WRF simulations using different PBL parameterizations. Carlos Román-Cascón ( [email protected] ) Carlos Yagüe Mariano Sastre Gregorio Maqueda. Universidad Complutense de Madrid. - PowerPoint PPT Presentation
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2011-2012 winter RADIATION FOGS at
CIBA (Spain): Observations compared to WRF
simulations using different PBL parameterizations
Carlos Román-Cascón ([email protected])Carlos YagüeMariano SastreGregorio Maqueda
Universidad Complutense de Madrid
EMS & ECAC 2012. Łódź, Poland11th September 2012
1. Introduction2. Overview3. Observations4. WRF Model results5. Conclusions6. Future study
CONTENTS
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RADIATION FOGS- Effects on daily life – Transport.- Physical processes not well understood. - not well parameterized in NWP models. - no good forecasts of fogs.
ROLE OF TURBULENCE OVER FOGS- It acts favoring the development (Welch et al.,1986).- It acts favoring the dissipation (Roach et al.,1976).- Turbulence threshold between development and dissipation (Zhou et al., 2008).
MAIN GOALS- To improve the fog prediction and to improve the knowledge about the
physical processes affecting the formation/dissipation of fogs.
1. INTRODUCTION
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2. OVERVIEWIberian Peninsula
25 km
Northern Spanish Plateau Montes Torozos
800 km2 840m asl
CIBA site
CIBA SITE
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2. OVERVIEW 3-14 January 2012 (12 days) Synoptic Situation
5. CONCLUSIONSOBSERVATIONS- Certain degree of turbulence to extend the fog in the vertical. - Nocturnal turbulence ~ 0.05 m/s Great surface thermal inversions Shallower fogs.
SIMULATIONS- Tendency to overestimate the temperature. - Tendency to “rise up” the fog. - Tendency to dissipate the fog at midday (not able to simulate persistent fogs)- Problems to predict shallow fogs related to high inversions.
- QNSE and MYNN2.5 in general better. - Lin et al. & Goddard Microphysics Improve the fog forecasting for days with difficulties. - RUC Land Surface Improve more the fog forecasting- Combination of errors good prediction of fog?
- Many different processes working together! - Still many problems simulating fogs, and consequently affecting T2, SW, LW…
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6. FUTURE STUDY (soon)- Statistic with more data (bias, RMSE)
- Detailed analysis of some concrete day
- More data (ceilometer + visibilimeter) Better comparison with simulations
- Interaction between Internal Gravity waves & Fogs
17.5 18 18.5-0.1
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17.5 18 18.5-1
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4Temperature
UTC
2m 10m 20m 35m 97m
Filtered pressure
(hPa)
Wavelet analysis
35 mTemperature
(ºC)
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THANK YOU !!
(this is not a radiation fog!!!)
Thanks to EMS for the Young Scientist Travel Award (YSTA) 19/19