GEOG 1101 Lecture Notes - Lecture 1: Evapotranspiration, Transpiration, Evaporation

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GEOG LESSON 1
ATMOSPHERIC MOISTURE & HUMIDITY
Hydrologic Cycle is the continuous movement of water from the earth's surface to the atmosphere and
back to the surface, then to the atmosphere.
* Basic cycle involves the processes of Evaporation & Transpiration
(Evapotranspiration), Condensation, Precipitation, Runoff
* Transpiration refers to the water released to the atmosphere
by vegetation during the process of photosynthesis.
* Evapotranspiration is the combined amount of water lost by
evaporation and transpiration.
States of Water (Matter): solid, liquid, gas
Know these & the processes that change water from one state to another:
melting, evaporation, condensation, freezing,
sublimation, deposition
Also, know whether heat energy is absorbed, or released during each process.
Change of State Process Energy released or absorbed
solid to liquid melting absorbed
liquid to gas evaporation absorbed
gas to liquid condensation released
liquid to solid freezing released
solid to gas sublimation absorbed
gas to solid deposition released
HUMIDITY is a measure of the amount of water vapor in the air. It can be measured in different ways.
Specific Humidity is measured as the grams of water vapor (H2Ov)
per kilogram (kg) of air. A mass to mass measurement.
Absolute Humidity is measured as the grams of water vapor (H2Ov)
per cubic meter (m3) of air. A mass to volume measurement.
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