GY 101 Lecture Notes - Lecture 4: Air Methods, Humidity, Dew Point
19 Feb 2018
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Moisture: continents precipitation > evaporation, oceans precipitation < evaporation. Differences in evaporation: potential evaporation = temperature, actual evaporation depends on temperature and water availability. Potential evaporation: sahara = super-hot with no water to evaporate, higher latitudes are not as hot (cid:271)e(cid:272)ause (cid:449)ater doesn"t e(cid:448)aporate. Distribution of earth"s water: 3% fresh, 97% ocean, 68. 7% icecaps/glaciers, 30. 1% groundwater, 87% lakes, 11% swamps, 2% rivers, liquid water = water molecules are still tightly packed but are moving fast enough that. Humidity: water vapor in the air: methods. **the higher the temperature, the more water vapor can the air hold** Absolute: density of water vapor in a parcel of air, d = mass of water vapor (grams)/volume of air (m3, not commonly used in forecasting because of problems associated. Vapor pressure: each water molecule exerts a push, more molecules = more push/pressure, as water molecules evaporate, the more vapor pressure increases.
