GEOG 1400 Chapter 6: #2 geog 1400 Precipitation, Air Masses & Fronts
Document Summary
Saturation must occur for condensation & cloud formation to occur. Causes of condensation: the addition of water vapour: e. g. vapour loading over lakes (like the great lakes), seas & oceans, adiabatic cooling of the air to its dewpoint temperature. Condensation nuclei or particles are needed in the air for condensation to occur. There are two types of nuclei: hygroscopic particles : dust or aerosols & salt particles, non-hygroscopic particles :which require the relative humidity to be >100% before they can act. , e. g. minute ice particles. Condensation forms clouds of various types at higher altitudes in the troposphere. Hoar frost (if the object"s temperature is < 0oc) Radiation fog :is caused by the loss of heat from the surface & cooling of the moist air above leading to condensation. Monday, january 1, 2018 drainage (katabatic air flow). Upslope fog: as air moves upslope it cools & moisture may condense.
