GGR214H5 Lecture Notes - Lecture 7: Cirrocumulus Cloud, Altocumulus Cloud, Ice Nucleus
Document Summary
Exam not cumulative: when water condenses on aerosols, it forms the water droplets that make up clouds or fogs, droplets are curved and have diff saturated vapour pressures than flat surfaces. Nucleation below freezing: temp at which droplets will freeze depends on their size, homogenous nucleation, below -40c, spontaneous freezing, heterogenous nucleation, bw 0 and -40 c. Clouds: 5 ways clouds form, convection, orographic lift, convergence. Low pressure, air moves into the low pressure, collide, go up and take the air with it , clouds form: frontal lifting, one air mass over the other, divergence. Low clouds: mix of water and ice, middle clouds, 2km up to 3-6 km, high clouds, mostly ice crystals, extend up to the tropopause, cirrus, wispy, thin, cumulus, fluffy, clumped, stratus, solid sheet of cloud. Ice crystals cause to have ragged edges: can cause haloes to appear around the sun or moon, falling ice crystals create fall streaks, create sun dogs.
