Understanding Pressure - Vertical, Horizontal Distribution & Measurement in Climatology YouTube Lecture Handouts

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Understanding Pressure - Vertical, Horizontal Distribution & Measurement in Climatology

Climatology Pressure

  • Wind and atmospheric pressure both are important controlling factors of Earthีšs weather and climate.
  • Wind exists because of horizontal and vertical differences (gradients) in pressure.
Illustration: Climatology Pressure

Vertical Distribution

  • At the lower layer of the atmosphere:
    • Density of air and the atmospheric pressure is high.
    • Atmospheric pressure decreases with increasing height.
  • Troposphere the rate of decrease in air pressure is 34 mb for every 300 m of height.
  • The various layers include troposphere, stratosphere, mesosphere and thermosphere
Illustration: Vertical Distribution

Horizontal Distribution (At Sea Level)

The various winds discussed are:

  • Northeast Trade winds
  • South westerlies
  • Polar easterlies
Illustration: Horizontal Distribution (At Sea Level)
Illustration: Horizontal Distribution (At Sea Level)

Barometer

  • It is an instrument measuring atmospheric pressure.
  • Used especially in forecasting weather and determining altitude.
Illustration: Barometer

Aneroid Barometer

  • A device for measuring atmospheric pressure without the use of fluids.
Illustration: Aneroid Barometer

Mercury Barometer

  • In that, atmospheric pressure balances a column of mercury.
  • The height of which can be exactly measured.
Illustration: Mercury Barometer

โœ Manishika