Lecture7_GEOG1400

Since precipitation exceeds evaporation water runs

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Unformatted text preview: Since precipitation exceeds evaporation water runs off to the oceans FIGURE 11.6 Hydrological cycle Humidity Humidity Humidity Humidity refers refers to the amount of water vapour present in the air th i Temperature is very important: warm air can hold more water vapour warm air can hold more water vapour than than cold air; air at room temperature can hold 3X as much water as water can hold 3X as much water as water vapour 0° vapour at 0°C. Relative Humidity Relative Humidity Relative Humidity Relative Humidity compares compares the amount of water vapour present to the maximum amount that the air can hold at that temperature: temperature: RH=e RH=ea/esat*100 If If ea=500 Pa and esat is 1000 Pa then RH is 50% 50%. Change Change in RH: Evaporation, Temperature (Lower (Lower temperature results in a Higher Humidity) Dew Dew-point If air is slowly chilled it will reach If air is slowly chilled, it will reach of saturation, saturation, with a relative humidity of 100% 100%. At this point the air cannot hold anymore At this point the air cannot hold anymore moisture, moisture, further cooling causes condensation, dew to form. T...
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