Evaporation and Transpiration Precipitation is caused by two forces: (1) 12. As

Question

Evaporation and Transpiration Precipitation is caused by two forces: (1) 12. As warm air moves across a se or increasing water vapor and (2) decreasing air temperatures to its dew point. Increasing water vapor happens in a variety of ways. The dominant source of atmospheric water vapor is evaporation. As a warm air mass moves across a cooler body of water, liquid water evaporates into gaseous water increasing the air mass's humidity, or the amount of water in an air mass. Secondly, when plants absorb water from their roots, the water is carried through their vascular system and is released to the atmosphere through small pores in their leaves, a process known as transpiration ool ocean (Fig. 9), do the following phenomena in remain the same? Evaporation_ Humidity Transpiration Figure 9. A warm air mass moving over cool water. Condensation As air masses cool, water vapor condenses to liquid water, forming clouds. Eventually, this water falls back to Earth as precipitation (as rain, snow, or ice), when the atmosphere becomes saturated with water vapor. Dew point is the temperature at which water vapor condenses into liquid water at the same rate it evaporates. At temperatures below the dew point, water in the atmosphere condenses and precipitates; while at temperatures above the dew point, atmospheric liquid water vaporizes into 12. As air rises (Fig. 10), do the following phenomena increase, decrease or remain the same? Air pressure Dew point Temperature Precipitation Figure 10. Condensation and precipitation via adiabatic cooling.

Explanation / Answer

Figure 9.

Evaporation increase. Warm air results in elevation of temperature of cool water and hence rate of evaropration increases.

Humidity increase. Because of increase in rate of evaporation, water content of atmospheric air rises.

Transpiration increase. The rate of Transpiration increases because relative humidity around leaves of plants decreases by movement of warm air.

Figure 10.

Air pressure increase.

Dew point increase.

Temperature decrease.

Condensation increase.

Precipitation increase.

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