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Unformatted text preview: EES 108 Test # 2 Answers Answer Key for Test #2 Section 1. Multiple-choice questions. Choose the one alternative that best completes the statement or answers the question. Mark your choice on the optical scan sheet. 1. Regarding isobars, it is true that: (a) their spacing indicates the strength of the pressure gradient. (b) they are drawn at 10 mb intervals in the United States. (c) they depict areas having the same barometer reading. (d) you will not find them on Canadian pressure charts. Answer: Choice (c) is incorrect because isobar lines refer to sea-level pressure and many parts of the country (Colorado, for example) are far above sea-level, so 1000 mb isobar line crossing Denver CO (1.6 km above sea level) would cor- respond to a barometer reading of 820 mb. This difference was discussed briefly in class and in the textbook on page 172 (Pressure changes with altitude and Fig. 6-6), but I decided that its really too subtle and tricky a matter to try to catch you out on this detail on a test, so Im giving full credit for answer (a) (the ab- solutely correct answer) and answer (c), which is technically incorrect, but only because of a subtle detail. 2. This prevents wind from blowing directly in the direction of the horizontal pressure gradient force: (a) friction with the ground. (b) the earths magnetic field. (c) interaction with the solar wind. (d) the Coriolis effect. 3. A geostrophic wind: (a) follows the pressure gradient force. (b) curves around to flow toward its original source. (c) flows perpendicular to the pressure gradient force. (d) is usually not affected by the Coriolis force. 4. The most common mechanism of cloud formation is: (a) adding water vapor to the air (b) mixing warm moist air with cold air (c) adiabatically cooling air to the dewpoint as it rises. (d) radiatively cooling the air to the dew point. (e) none of the above 5. Sometimes large temperature differences occur across relatively short horizontal distances. These zones are called: (a) fronts. (b) jet streams. (c) anti-cyclones. (d) inversions. 2 of 9 Wednesday Mar. 26 EES 108 Test # 2 Answers 6. The most important principle underlying the Bergeron process is this: (a) for a given temperature, the saturation vapor pressure for ice is less than that for super- cooled water. (b) large drops fall faster than smaller drops. (c) aggregation takes place more rapidly than accretion. (d) the bottom part of the cloud where the process is taking place must be warmer than 0 degrees Celsius. 7. Mid-latitude cyclones in the Northern Hemisphere typically travel primarily in this direction: (a) west to east. (b) east to west. (c) south to north. (d) north to south....
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- Spring '08