1. Meteo 003 Lab 3 Due Friday September 16th
3.12ab, 3.13abcde, 3.15ab, 3.16ab
4.1ab, 4.2, 4.6, 4.7b, 4.8

2. Problem 3.12 a,b a) Gulf Stream
Originates in the Gulf of Mexico, travels around the tip of Florida and continues along the eastern coastline.
Current of relatively warm ocean water.
b) Map interpretation
Use the color coding on the map to interpret temperatures

3. Problem 3.13 a,b,c,d,e All about Seasonality
Large bodies of water moderate temperature
Coastlines and islands vs. landlocked areas
Prevailing wind direction
West coast vs. east coast
Location and direction of flow of the Gulf Stream and California currents (Part e)
See Fig. 3.17

4. Problem 3.15 a,b a)
To compute the diurnal range, average the difference between maximum and minimum temperatures over the 10 years of data. b)
How would clouds affect max and min temperatures?

5. Problem 3.16 a 30 40

6. Problem 3.16 b
Albedo- Amount of solar energy reflected back into Space
Dark objects have low albedos (absorb more than reflect)
Asphalt, soil
Light objects have high albedos (reflect more than absorb)
Ice, snow

7. Problem 4.1 a Relative Humidity
Relative humidity depends on temperature
Can change even if water vapor content doesn’t
Warm air can include (air doesn’t technically “hold” water vapor) more water vapor than cold air
Constant dew point means that amount of water vapor in air will be ___________?
As Temperature Increase, equilibrium vapor pressure becomes larger while vapor pressure remains the same  so RH becomes smaller
As Temperature decreases, equilibrium vapor pressure becomes smaller while vapor pressure remains the same  RH becomes larger
RH = vapor pressure/equilibrium (saturation) vapor pressure x 100%

8. 4.1 b Dew Point Depression = Temperature – Dew Point
Things to consider
Time of day dew point depression is greatest/least
What happens when dew point depression = 0?
Relative humidity = ?%
Air is ________?
Vapor pressure (>, <, =) equilibrium vapor pressure?
As Temperature decreases, dew point depressions decreases (given temp is getting closer to dew point)
So RH will increase as dew point depression decreases (When DPD is 0 that is when air is completely saturated)

9. Problem 4.2 Fog can be considered a low lying cloud.
Fog forms where air is saturated.
What does the dew point depression equal when air is saturated?

10. Problem 4.6 Relative Humidity =
Vapor Pressure/ Equilibrium Vapor Pressure * 100%
Given 2 out of 3 variables in equation, you will solve for missing variable
Ex).
- RH = 75%
- Vapor Pressure = 9mb
- Eq. Vapor Pressure = ?
9mb/0.75 = 12mb

11. Problem 4.7 b Pacific Ocean Vs. Gulf of Mexico
Which is generally warmer/colder? Think about ocean currents and latitude.
Higher temperatures increase evaporation rate, lead to more water vapor in the atmosphere

12. Problem 4.8 What is the molecular mass of O2? N2?
Density = mass/volume
Given two parcels of air with equal volumes.
Calculate molecular mass to determine density of air.
Ex). What is the molecular mass of H2O?
Oxygen = 16AMU, Hydrogen = 1AMU
2 Hydrogen + 1 Oxygen = 2 x 1AMU + 16AMU = 18AMU
What is the molecular mass of O2? N2?

13. Dry Line

14. LAB #3 – DUE FRIDAY SEPT. 15th
Office hours: Thursday 2-3 PM 6th floor Walker Weather Center
Please me if you have any questions or don’t understand a concept!
LAB #3 Assignment Summary
Chapter 3: (12 a,b) (13 a,b,c,d,e) (15 a,b) (16 a,b)
Chapter 4: (1 a,b ) (2) (6) (7 b only) (8)