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Seasonal dependence of WRF model biases and sensitivity to PBL schemes over Europe

Revista: Quarterly Journal of the Royal Meteorological Society
Año: 2013   Volumen: 139
Página inicial: 501   Última página: 514
Estado: Publicado
En este estado desde: 13 Mar 2013
Archivo PDF: Garcia-Diez_et_al_2012.pdf
DOI: 10.1002/qj.1976

The seasonal dependence of Weather Research and Forecasting (WRF) model surface temperature biases and sensitivity to PBL schemes are jointly explored.
For this purpose, the year 2001 was simulated using three different PBL schemes in a domain covering all Europe. The simulations were compared
with gridded observations, upper air data and high-frequency station data. Seasonal and daily cycles were analysed, aiming at providing a link between
long term biases and restricted case studies. The results show that the model mean bias significantly depends on the season, being warm in winter and cold
in summer. The winter warm bias is related to misrepresented cold extremes, while a systematic cold bias dominates the whole temperature range in summer.
Regarding PBL schemes, an overall underestimation of the entrainment is found, with the non-local YSU scheme producing systematically warmer
temperatures. It is shown that the opposite seasonal biases and the systematic behaviour of the PBL schemes along the year lead to a different best-performing scheme in winter and summer. Moreover, the best-performing PBL scheme in an average sense is a result of the compensation of errors. The average summer results can be partially explained by a detailed case study. It is concluded that short term studies should be used with caution to decide on the parametrizations to be used in long term simulations.