Advances in Science and Research www.adv-sci-res.net 1992-0628 1992-0636 2 7th EMS Annual Meeting and 8th European Conference on Applications of Meteorology 2007 2008 10.5194/asr-2-31-2008 http://www.adv-sci-res.net/2/31/2008/ http://www.adv-sci-res.net/2/31/2008/asr-2-31-2008.html http://www.adv-sci-res.net/2/31/2008/asr-2-31-2008.pdf 31 34 2008-04-24 Analysis of turbulence in fog episodes E. Terradellas enric@inm.es E. Ferreres M. R. Soler Agencia Estatal de Meteorología, Barcelona, Spain Universitat Politècnica de Catalunya, Manresa, Spain Universitat de Barcelona, Barcelona, Spain Many processes interact in a complex and highly non-linear way during the life cycle of fog, the turbulent transport being among them. Observations and analysis of turbulence are, then, fundamental to our understanding of the physical mechanisms involved with fog formation, evolution and dissipation. Data gathered by fast-response sonic anemometers are processed using wavelet methods in order to estimate turbulence parameters such as kinetic energy or fluxes during the successive stages of fog evolution. Bergot, T., Terradellas, E., Cuxart, J., Mira, A., Liechti, O., Mueller, M., and Nielsen, N. W.: Intercomparison of Single-Column Numerical Models for the Prediction of Radiation Fog, J. Appl. Meteor. Climatol., 46, 504–521, 2007. Bowen, B. M.: Improved wind and turbulence measurements using low cost 3-D sonic anemometers at a low wind site, Preprints of the 13th A.M.S. Symposium on Meteorological Observations and Instrumentation (7.4), Savannah, GA, 2005. Duynkerke, P. G.: Radiation fog: a comparison of model simulation with detailed observations, Mon. Weather Rev., 119, 324–341, 1991. Fuzzi, S., Facchini, M. C., Orsi, G., et al.: The Po Valley Fog Experiment 1989: an overview, Tellus, 44B, 448–468, 1992. Gultepe, I., Tardif, R., Michaelides, S. C., Cernak, J., Bott, A., Bendix, J., Müller, M. D., Pagowski, M., Hansen, B., Ellrod, G., Jacobs, W., Toth, G., and Cober, S.G .: Fog Research: A Review of Past Achievements and Future Perspectives, Pure Appl. Geophys., 164, 1121–1159, 2007. Roach, W. T., Brown, R., Caughey, S. J., Garland, J. A., and Readings, C. J.: The physics of radiation fog I – a field study, Q. J. Roy. Meteor. Soc., 102, 313–333, 1976. Terradellas, E., Soler, M. R., Ferreres, E., and Bravo, M.: Analysis of Oscillations in the Stable Atmospheric Boundary Layer Using Wavelet Methods, Bound.-Layer Meteorol., 114, 489–518, 2005. Welch, R. M. and Welicki, B. A.: The stratocumulus nature of fog, J. Appl. Meteorol., 25, 101–111,1986. Zhou, B. and Ferrier, B. S.: Asymptotic Analysis of Equilibrium in Radiation Fog, J. Appl. Meteor. Climatol., in press, 2008.