ATOC 181 Lecture Notes - Lecture 6: Fluid Parcel, Cumulus Cloud, Cool Air
16 Jan 2017
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Document Summary
When h2o phsae changes, it exchanges heat with the surrounding air, causing the air temperature to change (latent heating) Intensified mid-latitude cyclones _ hurricanes heat at diff. locations in atmosphere: evaporation from earth"s surface, cools air and supplies moisture, humidity increases. Heat transfer: 3 mechanisms, conduction (molecular motion, convection (macroscopic fluid motion, radiation (electromagnetic waves) Silver/copper = good: a poor conductor is a good insulator. Transfer of heat by mass movement within fluid: atmospherically, 2 components, advection: transfer by bulk air motion (horizontal or vertical by wind, occurs when primary wind direction has a component along temperature gradient. Transports warm/cold air into new region: atmospheric convection: vertical circulations driven by buoyancy differences, air parcel: air that moves freely but does not exchange heat with surroundings. Same pressure (but not t or density) as its surroundings at the same height: air parcel - vertical motion determined by density. Warm parcel - less dense (positively buoyant)
