# Shared Flashcard Set

## Details

2
GEO 346C
27
Geology
01/28/2014

Term
 Absolute Humidity
Definition
 water content of air in in [M]/[V] units   g water/m3 air
Term
 Vapor Pressure (e)
Definition
 water content of air in force/[L]2 units   partial pressure of water vapor in air
Term
 Saturation Vapor Pressure (es)
Definition
 maximum water content of air at ambient temperature   vapor pressure above a freely evaporating surface in equilibrium
Term
 Precipitable Water
Definition
 total, integrated water content of a vertical column of the atmosphere (i.e., total water hanging over your head)
Term
 Relative Humidity (RH)
Definition
 ratio of ambient to maximum air water content   (RH) = ( e / es ) x 100%
Term
 Vapor Pressure Deficit
Definition
 difference between ambient and maximum air water content   (VPD) = ( es – e ) = es (1 - RH)
Term
 Dewpoint
Definition
 Temperature that ambient air would be at its maximum water content   T=>Td e=es RH = 100% condensation forms
Term
 Water Equivalent
Definition
 water content of snow
Term
 Condensation
Definition
 occurs when ambient = maximum air water content
Term
 Sublimation
Definition
 Solid --> Gas
Term
 Deposition
Definition
 Gas --> Solid
Term
 Melting
Definition
 Solid --> liquid
Term
 Freezing
Definition
 Liquid --> Solid
Term
 Condensation
Definition
 Gas --> Liquid
Term
 Vaporization
Definition
 Liquid --> Gas
Term
 Triple Point
Definition
 the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.
Term
 Latent Heat of Vaporization
Definition
 the amount of energy required for evaporation   λv=2260 kJ energy / kg water
Term
 Potential Evapotranspiration (PET)
Definition
 it is the ‘potential’ maximum rate of ET under the given meteorological  conditions if water is unlimited and freely able to ‘jump’ into the atmosphere   PET = (change in pan water depth) x (pan coefficient)
Term
 Precipitation
Definition
 water transferred to earth from the atmosphere   occurs when moist air is cooled to its dewpoint
Term
 Transpiration
Definition
 the process by which plants lose water to the  atmosphere    occurs by evaporation from the wet inside of plant leaves
Term
 Stomata
Definition
 pores on the leaf surface where water exits
Term
 Evapotranspiration
Definition
 process by which water is discharged from the land/water/vegetation surface  to the atmosphere through the combined processes of evaporation (water and soil and leaf surfaces) and transpiration (leaf interior)
Term
 Interception
Definition
 precipitation stuck to leaves
Term
 Throughfall
Definition
 can drip through
Term
 Stemflow
Definition
 can run down stem
Term
 Leaf evaporation
Definition
 can evaporate
Term
 Direct Precipitation
Definition
 falls on water
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