7.3 In the late autumn, with the onset of longer nights and shorter days, Lake S

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7.3 In the late autumn, with the onset of longer nights and shorter days, Lake Superior in the northern United States remains relatively warm while the surrounding land begins to cool. The temperature difference between the land and adjacent lake is largest at night, and is confined to the lowest 50 hPa of the atmosphere. (a) Calculate the wind speed between the land and the lake 2 hours after the horizontal temperature difference described above has been established, assuming that the temperature difference between 10 km inland to 10 km offshore is 5 K and that the average temperature is 278 K. You may assume that at sunset there is initially no temperature difference or horizontal pressure gradient between the land and the lake. (b) Is this wind directed from the land to the lake or from the lake to the land? Why?

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7.3 In the late autumn, with the onset of longer nights and shorter days, Lake S

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