GEOG 1010 Lecture Notes - Lecture 8: Cloud Condensation Nuclei, Fluid Parcel, Supercooling
Document Summary
An adiabatic process is a change in temperature within a gas that happens only as a result of a change in pressure. Important in studying weather & the motion of air because atmospheric pressure decreases with altitude. Lift a parcel of air away from the surface the pressure on the parcel decreases. In an adiabatic process there is no exchange of heat with the near environment. Condensation & cloud formation requires microscopic particles known as cloud condensation nuclei. Radiation fog, forms when a surface cools the air directly above, often forms at night. Fog: a cloud layer close to surface, formed when the air & dew point temperatures are nearly identical. Advection fog forms, when air migrates to a place where the conditions allow saturation to occur. Happens along some coastlines and is called a sea fog. Valley fog, in which cold air descends down a valley, is like a radiation fog.
