. – Micrometeorology PROFESSOR GIACOMO GEROSA Text under revision. Not yet approved by academic staff. COURSE AIMS Micrometeorology deals with the turbulent processes involved in the exchanges of energy and matter between the atmosphere and the Earth's surface. Knowledge of this subject is crucial in the study of interactions between air pollutants and the biosphere, and in particular vegetation. COURSE CONTENT 1- Introduction. Scales of investigation: PBL and ASL. Quantities and overview of thermodynamics applied to the atmosphere. Meteorology and micrometeorology. 2- Surface energy balance. Equations and applications to different surfaces (ground, vegetation and bodies of water). Solar radiation and surface radiation balance. Short and long wave radiation. Net radiation. Light interception, absorption and reflection by ground cover. Remote sensing. Surface temperature and heat transfer to and from the soil. 3- PBL. Thermal characteristics. Vertical profiles of temperature, humidity and wind. Stability, mixing layers and inversions. 4- ASL and turbulence in the boundary layer. Laminar flow and development of boundary layers. Turbulent motions: general characteristics. Continuity equation and Reynolds decomposition. Vortices and the scale of motions. Kolmogorov's theory. Taylor's hypothesis. Mathematical description of turbulent flows. Dimensional analysis and the Monin-Obukhov similarity theory. 5- Stability in the boundary layer. Neutral conditions. Wind speed profile equations and surface roughness parameters. Conditions of stability and instability. Monin-Obukhov length and similarity functions. 6- Methods for investigating the boundary layer. Measuring instruments for atmospheric and turbulence parameters. Energy balance methods. Bowen ratio. Eddy Correlation. Aerodynamic gradient. 7- Micrometeorology of terrestrial ecosystems. Evaporation and evapotranspiration. Resistive analogy and Penman-Monteith description. Stomas and evaporation: Jarvis's description of stomatal behaviour. Coupled canopy-atmosphere. Profiles and fluxes of energy and matter. Pollutant flows in ecosystems. Examples and maps. READING LIST P. ARYA, Introduction to micrometeorology, Academic Press, San Diego, California, 2001 J.L. MONTEITH - M.H. UNSWORTH, Principles of Environmental Physics, 3rd edition. Elsevier Science & Technology, 2014. F. VENTURA - P. ROSSI PISA, Strumenti per l’agrometeorologia, Aracne Editore for consultation, 2004 R.B. STULL, An introduction to boundary layer meteorology, Kluwer, 1988. P. CECCON - M. BORIN, Elementi di Agrometeorologia e Agroclimatologia, Ed. Imprimitur, 1995. TEACHING METHOD Lectures, group workshops, laboratory activities and - possibly - visits to micrometeorological installations ASSESSMENT METHOD Oral examination with discussion of a micrometeorology paper chosen by the candidate. Optional individual short dissertation. NOTES Further information can be found on the lecturer's webpage http://www2.unicatt.it/unicattolica/docenti/index.html or on the Faculty notice board. at

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