Conservation of Moisture

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Presentation transcript:

Conservation of Moisture The Moisture Equation

1st Law of Thermodynamics (Conservation of Energy) Equation of State 1st Law of Thermodynamics (Conservation of Energy) Moisture Equation (Conservation of Moisture) Continuity Equation (Conservation of Mass) Equations of Motion (Conservation of Momentum) Coming to an ATMS 251 lab near you on March 22

Hydrologic Cycle – What can happen to moisture?

Moisture Equation Mathematical representation of what can happen to water in a column of the atmosphere Evapotranspiration from ground Change of moisture storage in the column Precipitation Moisture Inflow from atmosphere Moisture Outflow from column

Precipitable Water The vertical integral of the specific humidity for a column of atmosphere Represents the upper limit to the total precipitation that may fall Units: m (mm)

Average Specific Humidity for the layer Pressure Interval Sum up the number of levels This will yield the precipitable water in units of kg/m2. To get PW in units of meters, divide by the density of water (ρw=1000 kg/m3)

http://www.osdpd.noaa.gov/PSB/IMAGES/images/amsua_tpw_des.gif

Moisture Advection Of course, moisture can be transported horizontally and vertically in the atmosphere Moisture Advection

http://ww2010.atmos.uiuc.edu/guides/mtr/af/adv/gifs/madv1.gif