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Understanding Atmospheric Layers, Humidity, and the Water Cycle

This lesson covers key concepts in atmospheric science, focusing on the four layers of the atmosphere, humidity measurement, and the water cycle process. Students will learn about the troposphere, stratosphere, mesosphere, and thermosphere, along with how to calculate relative humidity and dew point using a sling psychrometer. Additionally, we'll explore the processes of evaporation, condensation, precipitation, infiltration, and runoff in the water cycle. Practice questions are included to enhance comprehension and retention of these vital concepts.

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Understanding Atmospheric Layers, Humidity, and the Water Cycle

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  1. Today • Hand in any work needed. • Check the list, if you owe something. • Get out a small piece of paper, PUT YOUR NAME ON IT. • When bell rings the quiz will start and you will have 1 minute per question to answer

  2. Question 1 • What are the four layers of the atmosphere from Earths surface?

  3. Question 2 • What is the altitude of the stratopause?

  4. Question 3 • What is the temperature at the mesopause?

  5. Question 4 • What is the temperature in oC for 140oF?

  6. Question 5 • What is the Density if, a 2cm cube had a mass of 24g?

  7. Answers • What are the four layers of the earth from the surface? • Troposphere, Stratosphere, Mesosphere, Thermosphere • What is the altitude of the stratopause? • 50 km • What is the temperature at the mesopause? • -90oC • What is the temperature in oC for 140oF • 60oC • What is the Density if, a 2cm cube had a mass of 24g? • 3 g/cm3

  8. Moisture in the Atmosphere Beaker demo

  9. Humidity • This is how much moisture is in the air. • Saturated air is air that is full of water. • Dew point is the point that air must be cooled to for a cloud to form.

  10. Humidity • How do we measure humidity? • Sling Psychrometer • Dry Bulb- Air temperature • Wet Bulb – temperature of saturated air.

  11. Write this down! • To find the RH you need the dry bulb (temperature) in oC • Then find the difference between Dry Bulb and Wet Bulb. • Look up DB • Look up Difference • Where they intersect is the Rel Humidity.

  12. What is the Humidity if: • DB=10oC & WB=10oC • 100% • DB=20oC & WB=7oC • 5% • DB=0oC & WB=-1oC • 81% • DB=-10oC & WB=-12oC • 33%

  13. Dew Point • This is the point where water vapor condenses to form clouds. • How do we measure it? • Same way we did with the humidity. • How do we find it? • Same way as humidity but with different chart.

  14. ESRT Practice • To find the DP you need the dry bulb (temperature) in oC • Then find the difference between Dry Bulb and Wet Bulb. • Look up DB • Look up Difference • Where they intersect is the Dew Point. Dry Bulb ALWAYS greater then Wet Bulb

  15. Dry Bulb ALWAYS greater then Wet Bulb Practice • What is the Dew Pt if DB=0oC & WB= -4oC? -15oC • What is the Humidity if DB=0oC & WB=4oC? 28% • What is the WB if DB=4oC & DP= -11oC? -1oC • What is the Dew P if the DB=8oC & Hum=39%? -5oC

  16. The Water Cycle • The process of water flowing to an from the oceans. Draw this

  17. Important parts of Water Cycle • Evaporation • Liquid water changing to gas • Condensation • Gas vapor to liquid water • Precipitation • Water falling to the ground • Infiltration • Water being absorbed • Run off • Water flowing off of surface

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