2.Distinguish between the geostrophic wind and the gradient wind.Difference between gradient and geostrophic winds generally doesn't exceed 10 - 20%3.The pattern of horizontal winds blowing about the center of a high-pressure system implies theexistence of a centripetal force. Explain why.Anything in circular motion about a center implies a centripetal force--that's what keeps it going in a circle.4.Why are horizontal winds associated with a sloping pressure surface (e.g., 700-mb surface)?On a horizontal surface that cuts through the 700-mb surface, there will be a pressure gradient. The wind tends to blow toward lower pressure (toward the north), but in the Northern Hemisphere, the Coriolis force deflects the wind toward the right, generating a wind from the West; the greater the pressure gradient, the stronger the wind.5.Describe the relationship between a high-pressure system and an air mass.The two main air masses are high pressure, and low pressure. In the northern hemisphere, the winds are clock-wise around, high pressure; counter clock-wise around low pressure.High pressure is more dense forcing air towards the earth's surface This action tends to dry the air. Low pressure is less dense, and tends to lift air, in general causing moisture to form.6.Along a coastline, cumuliform clouds are more likely with an onshore wind (directed from water to land) than an offshore wind (directed from land to water). Explain why.Onshore wind will bring lot of moisture from the adjacent water surface (sea). Moreover, due to the unequal heating of the land and sea surfaces, air over the land will be warmer and will rise leading toconvection. This convection carries the moisture brought about by the on-shore wind leading to the formation of cumuliform clouds. On the other hand, the offshore wind will be comparatively a dry wind with less moisture. So, the air will sink over the land which is an unfavorable condition for cloud formation.
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- Spring '18
- Joyce Miller
- Atmospheric thermodynamics, Adiabatic process, lapse rate, Geostrophic wind