Lab 8A - Lab 8A 1 Figure 1 represents a portion of a...

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Lab 8A 1. Figure 1 represents a portion of a surface weather map on which are plotted three straight, parallel isobars. Pressure is in mb units, and isobars are uniformly spaced and drawn with a 4-mb interval. ________ pressure is located across the top of the diagram. [ ]High [X ]Low 2.The diagram shows a pattern of air pressure changing over distance. Assuming that the atmosphere is initially calm, the only force acting horizontally on a parcel of air represented on the diagram at Point A is a pressure gradient force. Draw an arrow about a centimeter in length starting at Point A and aimed directly towards the top of the diagram that depicts the direction the pressure gradient force would act. Your arrow shows the pressure gradient force acting directly towards ________ pressure. This force is directed perpendicular to the isobar lines. The horizontal pressure gradient has given rise to a force that causes the air parcel at A to begin moving in the direction towards which the force is acting. [ ]highest [X ]lowest 3.Orient the cards in the “cross” position as shown in the drawing (iii). Place your pencil point at X. With the cards motionless, carefully draw a line on the loose card (B) along the cut-edge and directly away from you. The line you drew represents a path that is ________. [ X]straight [ ]curved 4.Now investigate how rotation affects the path of your pencil line. Again, begin with the cards in the “cross” position and your pencil point at X. As you slowly pull the lower left tab of the loose card (B) towards you, slowly move your pencil point away from you along the cut-edge while drawing its path on (B). The loose card is rotating counterclockwise as you do this. The line you drew is ________. [ ]straight [X ]curved 5.You actually moved the pencil point along a path that was both straight and curved at the same time! This is possible because motion is measured relative to a frame of reference. In this investigation, there are two different frames of reference; one fixed and the other rotating. When the pencil-point motion was observed relative to the fixed card (A) and its cut-edge, its path was ________. [ X]straight [ ]curved 6.When the pencil motion was measured relative to the rotating card (B), its path was ________. This apparent deflection of motion from a straight line in a rotating system is called the Coriolis Effect for Gaspard Gustave de Coriolis (1792-1843),

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who first explained it mathematically. Because Earth is a rotating system, objects moving freely across its surface exhibit curved paths, except at the equator. This
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