Chapter07b - Precipitation II Brief review Cloud droplets...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Precipitation II Brief review Cloud droplets are very small, much too small to fall as rain. The smaller the cloud droplet, the greater its curvature, and the more likely it will evaporate ( curvature effect ). Cloud droplets form on cloud condensation nuclei. Hygroscopic nuclei, such as salt, allow condensation to begin when the relative humidity is less than 100%. Also the salt dissolves in the condensed water, inhibiting evaporation and stimulating growth ( solute effect ). Droplets fall at constant speed ( terminal velocity ). Bigger droplets fall faster than smaller ones. Cloud droplets, in above-freezing air ( warm clouds ), can grow larger as faster-falling, bigger droplets collide and coalesce with smaller droplets in their path Today: Ice crystal (Bergeron) process Precipitation types Measuring precipitation Saturation Vapor Pressure The saturation vapor pressure P s , depends on the temperature . It increases with temperature. P s over water is larger than it is over an ice surface at the same temperature. unsaturated Super- saturated saturated Ice Crystal Particles The saturation vapor pressure above a water surface is larger than the saturation vapor pressure above an ice surface....
View Full Document

This note was uploaded on 01/26/2012 for the course MET 1010 taught by Professor Matchev during the Spring '08 term at University of Florida.

Page1 / 35

Chapter07b - Precipitation II Brief review Cloud droplets...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online