Moisture & Atmospheric Stability

• hydrologic cycle
• precipitation
• evaporation/transpiration
• infiltration
• runoff
• water phases (states)
• solid
• liquid
• gas
• latent/sensible heat
• latent heat of vaporization
• latent heat of fusion
• evaporation/condensation
• sublimation/deposition
• phase changes
• phase change calculations (.pdf file)
• water vapor content of air - absolute humidity and mixing ratio are similar. Both are expressed as the quantity of water vapor contained in a specific amount of air.

Under standard conditions (25oC, 1 atm), the density of air is 1.168 kg/m3. Therefore,
1kg of air would have a volume of 0.8562m3. To summarize..... 1kg of air has a volume about 15% smaller than 1m3.

mass of water vapor (grams)

• absolute humidity = ---------------------------------
•                                 volume of air (cubic meters)

•                                 mass of water vapor (grams)
• mixing ratio          = ---------------------------------
•                                 mass of dry air (kilograms)

DALR =   - 1.0oC/100m
WALR =  +0.5oC/100m
-------------------
- 0.5oC/100m