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Understanding Atmospheric Moisture: Evaporation, Humidity, and Measurement Techniques

This comprehensive guide explores moisture in the atmosphere, emphasizing its entry primarily from the ocean. We discuss factors affecting evaporation rates such as temperature, surface area, and wind speed. You'll learn about the phases of water in the atmosphere—solid, liquid, and gas—and the concept of evapotranspiration. The importance of measuring humidity, dew point, and the difference between dry and wet bulb temperatures is elaborated upon, highlighting tools and charts for accurate humidity measurement.

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Understanding Atmospheric Moisture: Evaporation, Humidity, and Measurement Techniques

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Presentation Transcript

  1. Topic: Moisture in the Atmosphere

  2. Water enters the Atmosphere by A) --- Mainly from Ocean 70% Earth’s surface

  3. Factors Effecting Evaporation Rate a) Surface Temperature Increases  ---

  4. b) Surface Area Increases  --- Evaporation Evaporation Puddle A Puddle B

  5. c) Humidity increases  --- Air is filled with water, no more evaporation. Evaporation Lake

  6. d) Wind Speed Increases -> --- Lake

  7. B) --- Evaporation and Transpiration = Evapotranspiration

  8. Water is found in all phases in the atmosphere • Solid – --- • Liquid – --- • Gas - ---

  9. How do we measure moisture in the Atmosphere

  10. Humidity • ---

  11. Relative Humidity • --- • ---

  12. Dew Point • ---

  13. Condensation What happens when the air temperature and dew point are the same?

  14. Sublimation / Deposition FROST SNOW

  15. Tools used to find Dew Point & Relative Humidity • --- • ---

  16. Measuring Relative HumidityToday you need your ESRT out

  17. Dew Point & Relative Humidity Charts Best Friend - pg 12

  18. The “Dry Bulb” = Air Temp • Don’t let it fool you. It is just a thermometer. 20°C

  19. The “Wet Bulb” • Has a little wet booty tied to the bottom. • Gets cool when water evaporates. 12°C Wet Booty

  20. 14°C 20°C 12°C 8°C A Dry Day… • A lot of moisture will evaporate. • The wet bulb will be a lot cooler than the dry bulb. 20°C Difference between wet bulb & dry bulb is 12 °C.

  21. A Humid Day… • A little bit of moisture will evaporate. • The wet bulb will not be much cooler than the dry bulb. 20°C 14°C Difference between wet bulb & dry bulb is 6 °C.

  22. Dry-bulb temperature = air temperature. 20 °C

  23. 14 °C

  24. Subtract (the difference) between the dry bulb and wet bulb

  25. 20°C 14°C - = -

  26. 18°C 16°C - = -

  27. Put it all together 20°C 8°C - = - Relative Humidity = %

  28. 14°C 10°C - = - Relative Humidity = %

  29. The Dew Point Chart works the same way 14°C 10°C - = - Dew Point = °C

  30. Try These. % °C % °C % °C

  31. % °C % °C °C % °C °C

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