Figure is a sea-level pressure chart (Northern Hemisphere), with isobars drawn every 4 mb....

Figure is a sea-level pressure chart (Northern Hemisphere), with isobars drawn every 4 mb. Answer the following questions, which refer to this map.

FIGURE Map for problem 2.

(a) What is the lowest possible pressure in whole millibars that there can be in the center of the closed low? What is the highest pressure possible?

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(b) Place a dashed line through the ridge and a dotted line through the trough.

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(c) What would be the wind direction at point A and at point B?

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(d) Where would the stronger wind be blowing, at point A or B? Explain.

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(e) Compute the pressure gradient between points 1 and 2, and between points 3 and 4. How do the computed pressure gradients relate to the pressure gradient force?

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(f) If point A and point B are located at 30°N, and if the air density is 1.2 kg/m3, use the geostrophic wind equation in the Focus section 8.3 to compute the geostrophic wind at point A and point B. (Hint: Be sure to convert km to m and mb to Newtons/m2, where 1 mb 5 100 Newtons/m2.)

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(g) Would the actual winds at point A and point B be greater than, less than, or equal to the wind speeds computed in problem (f)? Explain.