GEOG 001 Lecture Notes - Lecture 12: Fluid Parcel, Buoyancy, Dew Point
30 Sep 2020
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Document Summary
Body of hair that has the same temp and humidity. Stability: the tendency of an air parcel to remain in place or to move vertically (either up or down) Stable- resists movement, or returns to original position when no longer disturbed. Unstable- continues to rise until reaches an altitude where surrounding air has the same density and temp. Adiabatic processes: warming and cooling rates for a parcel of expanding/compressing air (cool by expansion, warm by compression) Dry adiabatic rate (dar)- air less than saturated. Environmental lapse rate (elr)- the actual lapse rate at a particular place and time. The relationship between dar and mar and elr produces 3 atmospheric conditions. Eventually, as the air parcel continues to rise and cool, it may achieve the dew point temp, saturation, and active condensation. Lifting condensation level (lcl)- point of saturation. An aggregation of tiny moisture droplets and ice crystals suspended in air with a great enough volume and concentration to be visible.
