fv5 - wind patterns

Topic: 4.5 Global Wind Patterns

Page 1: Solar Radiation and Convection Cells

  • Uneven Distribution of Heat

    • Earth's axis tilt causes uneven solar radiation distribution.

    • Heat accumulates at the equator, leaving poles cooler.

  • Circulation of Air

    • The Earth circulates warm air towards the poles and cooler air towards the equator.

  • Types of Convection Cells

    • Hadley Cells

      • Located between 0° and 30° latitudes.

      • Warm air rises at the equator and cools as it moves away, falling back down.

    • Ferrel Cells

      • Found between 30° and 60° latitudes.

      • Cold, dry air from Hadley cells pushes warm air upwards.

    • Polar Cells

      • Occur at latitudes greater than 60°.

      • Warm air from Ferrel cells rises, cools, and falls as dry air at the poles.

Page 2: Pressure, Wind Direction, and the Coriolis Effect

  • Pressure and Wind Dynamics

    • Wind travels from high-pressure to low-pressure areas.

    • Example: Wind flows from the Ferrel-Hadley boundary (30° latitude) to the Hadley-Hadley boundary (0° latitude).

  • Coriolis Effect

    • Demonstrated by throwing a ball on a spinning merry-go-round.

    • Objects in motion appear to curve due to the Earth's rotation.

    • Most noticeable at long distances and high latitudes.

  • Impact on Wind Patterns

    • Winds are deflected due to the Coriolis effect, creating curved wind currents.

    • Trade winds blow from the Ferrel-Hadley boundary to the Hadley-Hadley boundary.

Page 3: Key Terms to Review

  • Convection Cells

    • Circular patterns of air or water movement caused by uneven heating and cooling.

    • Hot air rises (low pressure), while cooler air sinks (high pressure).

  • Coriolis Effect

    • Apparent deflection of moving objects due to Earth's rotation.

    • Deflects winds to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

  • Trade Winds

    • Prevailing easterly winds blowing from east to west between 30° latitude and the equator.

    • Historically significant for sailors' trade routes across oceans.

Conclusion

Understanding global wind patterns is crucial for comprehending climate systems and weather phenomena. The interplay between solar radiation, convection cells, atmospheric pressure, and the Coriolis effect shapes the Earth's climate and influences various