Suppose a constant height chart for the 3000 meter level and consider two locati

Question

Suppose a constant height chart for the 3000 meter level and consider two locations at a latitude of 30°N that are 300 km apart. Suppose the isobars run north and south with the 700 mb isobar running through the western location and the 692 mb isobar passing through the eastern one. Assume the temperature is 268 K at 3000 meters

i) What is the direction and magnitude of the horizontal pressure gradient between these two locations?

      ii) What is the direction and magnitude of the horizontal pressure gradient force Pn?

     iii) What is the altitude of the 700 mb pressure surface at the eastern location?

Explanation / Answer

let us take 2 cities on 30 Degrees North latitude.

Firozpur (Punjab, India) - 30 deg 55 min North

Chandiagrh - 30 deg north , whcih is 300 km form above

1) Horizontal Pressure gradient = Change in pressure/ change in distancce = (700-692)/300 =8 mb/300 km

Direction from west to east as from high pressure to low pressure.

2) The force that results from pressure differences in a fluid such as our atmosphere is called the pressure force or the pressure gradient force. Air moves because of a pressure gradient force. The existence of a pressure gradient force is essential for sustaining winds.

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