Exercise 2

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Anoka Ramsey Community College *

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1103

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Geography

Date

Feb 20, 2024

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docx

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Uploaded by JudgeWolf3982

GEOG 1103 Name_ ____________ EXERCISE 2: WEATHER SYSTEMS 1. The diagram below shows the circulation of air at the surface. a) Is this a Northern or Southern Hemisphere example? b) How would this circulation look if it was located in the opposite hemisphere (don’t feel like you need to draw it out)? 2. For each of the four types of uplift described in our online video and discussed on pages 156-159 in our textbook, briefly describe what causes them in your own words: a) Frontal b) Convergent c) Convectional d) Orographic Figure 1, on the following page, shows a generalized cross-section across southern Oregon with elevations and precipitation amounts from a typical year. Elevations for specific locations are shown in parenthesis next to the locations’ name. Please note that the top of the Coast Ranges is 600m. Use this figure to answer the following questions. Assume you have a parcel of air coming onto land from the Pacific Ocean (just west, or left on this map, of the Coast Ranges) that starts at 25°C at sea level, with a dew point temperature of 22°C. *Remember: When an air parcel is unsaturated it changes at the DAR of 1°C per 100m; when an air parcel is saturated , it changes at the MAR of .6°C per 100m. HINT: Treat each mountain as a separate entity! 1

3. What are the temperature and dew point temperature at Langlois, located at 300m? _______ : _______ 4. After reaching the saturation point, both the temperature and dew point temperature will cool at the same rate. What are the temperature and dew point temperature at Powers, located at 500m? _______ : _______ 5. After reaching the apex of the Coast Ranges, the temperature will begin to heat. Which adiabatic lapse rate is appropriate to use at this point (DAR or MAR)? 6. At what elevation is saturation reached on the windward side of the Cascades? 7. Where would you expect annual precipitation to be higher, point X or point Y? Why? 8. Why is the rainshadow effect more severe on the leeward side of the Cascades than on the leeward side of the Coast Ranges? 9. Where else might you expect to find rainshadow areas in the United States? Figure 1: Adiabatic processes operating in southern Oregon. Precipitation totals in centimeters. Station altitudes in parenthesis. 2

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Exercise 2

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