Evaluation of WRF-ARW Model in Reproducing a Heavy Rainfall Event Over Chalkidiki, Greece: The Effect of Land-Surface Features on Rainfall
A record breaking 24 h accumulated rainfall event was observed in Chalkidiki Peninsula, Greece on the 8th of October 2006. Intense precipitation was associated with strong low level convergence imposed by a low pressure system developed over the Aegean Sea and topographical lifting in the area of interest. Severe flooding and damage was reported especially in the east coast of Chalkidiki. The ability of WRF model to simulate this extreme precipitation episode using three different operational microphysical schemes was tested by comparing the high resolution results with available raingauge data. The verification results indicate that WRF configuration using ETA Ferrier microphysics provides better statistical scores for heavy hourly precipitation rates while it was able to reproduce the spatial rainfall distribution of this event. PLIN scheme captures the measured 24 h accumulations especially where maximum precipitation is observed. Sensitivity experiments suggest that highly localized heavy rainfall was the result of an interaction between synoptic conditions and the topographical features, with large scale forcing imposing a low-level convergent flow field that produced heavy rain and topography enhancing highly localized precipitation maxima.
KeywordsHeavy Rainfall Event Microphysical Scheme Vorticity Advection Total Precipitation Amount Precipitation Episode
This work is co-funded by the European Union – European Social Fund (ESF) & National Sources, in the framework of the program “HRAKLEITOS II” of the “Operational Program Education and Life Long Learning” of the Hellenic Ministry of Education, Life Long Learning and religious. The authors would like to thank Hellas-Gold Company for providing available raingauge datasets.
- Ferrier BS, Jin Y, Lin Y, Black T, Rogers E, DiMego G (2002) Implementation of a new grid-scale cloud and precipitation scheme in the NCEP eta model. In: Proceedings of 19th conference on weather analysis and forecasting/15th conference on numerical weather prediction. American Meteorological Society, San Antonio, TX, pp 280–283Google Scholar
- Hong SY, Lim KS, Kim JH, Lim JO, Dudhia J (2009) Sensitivity study of cloud-resolving convective simulations with WRF using two bulk microphysical parameterizations: ice-phase microphysics versus sedimentation effects. J Appl Meteorol Climatol 48:61–76. doi: 10.1175/2008JAMC1960.1 CrossRefGoogle Scholar
- Skamarock WC, Klemp JB, Dudhia J, Gill DO, Barker DM, Wang W, Powers JG (2008) A description of the advanced WRF version 3. NCAR technical note NCAR/TN/u2013475+STRGoogle Scholar