need help with question 95? thanka 94) Which of the follow ing connects points o

Question

need help with question 95? thanka

94) Which of the follow ing connects points of equal atmospheric pressure? A) isohyets B ) isobars C) isotherms D) isotachs 95) Which of the following are true? A) Vertical pressure gradients are similar to horizontal pressure gradients. B) Vertical pressure gradients are slightly greater than horizontal pressure gradients C) Horizontal pressure gradients are slightly greater than vertical pressure gradients D) Vertical pressure gradients are very much greater than changes in horizontal pressure. 96) Which of the following is true about the geostrophic flow? A) Pressure gradient force equals the Coriolis force B) It occurs only in the upper atmosphere. C) Friction is not present. D) all of the above 7) Which of the following measure wind direction and speed? aerovane anemometer wind vane all of the above

Explanation / Answer

Pressure Gradient (PG) is a vector quantity.It defines direction and rate of increase of pressure at any location.Its unit is pressure per unit length(pascal/m).

Here the answer is option D.

REASON

If we go up in the atmosphere pressure falls rapidly as Normal Lapse Rate(the rate at which temperature decreases with increase in altitude) is -6.5°C per kilometre .As temperature decreases rapidly pressure also follows the NLR.Thus Vertical PG is much higher than the Horizontal PG.

Whereas if we go horizontally from a particular location rate of change in temperature is negligible and thus pressure gradient is small.

E.G: V.P.G=90 hPa/km

H.P.G= 10 Pa/km

as per a study in mid lattitude region.

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