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Chapter 3 & 4 (More Seasonality, Albedo, Water Vapor, Evaporation and Condensation)

Chapter 3 & 4 (More Seasonality, Albedo, Water Vapor, Evaporation and Condensation). Re-cap On Seasonality. Far from large oceans. High Latitude. Two factors that affect seasonality: Latitude. Proximity to large bodies of water. Use both factors to determine which continent

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Chapter 3 & 4 (More Seasonality, Albedo, Water Vapor, Evaporation and Condensation)

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  1. Chapter 3 & 4 (More Seasonality, Albedo, Water Vapor, Evaporation and Condensation)

  2. Re-cap On Seasonality Far from large oceans High Latitude • Two factors that affect seasonality: • Latitude. • Proximity to large bodies of water. • Use both factors to determine which continent should have the most seasonality.

  3. Ocean Currents

  4. Albedo Fraction of solar energy reflected from the Earth’s surface back into space. Lighter objects have higher albedo and darker objects have lower albedo. To stay cooler on a warm summer day, should you wear a white or black t-shirt?

  5. Relative Humidity Ratio of the vapor pressure to the saturation vapor pressure (times 100%). Simply put, tells us how much water is in the air relative to how much could be in the air if it were saturated. More water vapor can exist in warmer air than cooler air, thus the saturation vapor pressure depends on temperature!

  6. Relative Humidity (cont) RH = (Vapor Pressure / Saturation Vapor Pressure) * 100 Since Saturation Vapor Pressure depends on temperature, RH does as well. What is the Saturation (or equilibrium) vapor pressure if the RH is 50% and the vapor pressure is 5 mb? 50% = (5 mb/ Saturation Vapor Pressure) * 100 0.5 = 5 mb / Saturation Vapor Pressure Saturation Vapor Pressure = 5 mb / 0.5 = 10 mb

  7. Dew Point Another way to measure water vapor. Temperature at which air contains its maximum amount of water vapor. Rate of Condensation = Rate of Evaporation when the temperature cools to the dew point. AKA the air becomes saturated. “Cleaner” measure than the relative humidity because of it’s independence to temperature.

  8. RH vs. Dewpoint

  9. Dew Points in Wx Forecasting

  10. Why is moist air so buoyant? • What atmospheric variable is related to buoyancy? • Think about why you float in water if you fill your lungs. • What does this mean about the density of moist air relative to dry air?

  11. Lab Assignment 3.12 (a, b)3.13 (a, b, c, d, e)3.16 (a , b)4.1 (a, b)4.2 4.64.8

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