Summary
Wind is the horizontal movement of air, driven primarily by pressure-gradient force and modified by rotation and friction.
Core concept
Understand the system
Wind is the horizontal movement of air, driven primarily by pressure-gradient force and modified by rotation and friction.
Why / how it happens
Causes and context
Wind is the horizontal movement of air, driven primarily by pressure-gradient force and modified by rotation and friction. The governing relationship is: Unequal heating creates pressure differences; air accelerates down the pressure gradient, while Coriolis and surface friction alter its speed and direction.
Mechanism / process
Unequal heating creates pressure differences; air accelerates down the pressure gradient, while Coriolis and surface friction alter its speed and direction.
Key facts
- Wind direction is named for where it comes from.
- Geostrophic wind balances pressure-gradient and Coriolis forces above the friction layer.
- Sea breezes develop when land heats faster than adjacent water during the day.
Important terminology
- pressure gradient
- Coriolis force
- friction
- geostrophic wind
- land-sea breeze
Named examples / case studies
- The southwest monsoon is a seasonal wind system driven by land-sea thermal contrast.
Causes / components
- Key components: pressure gradient, Coriolis force, friction.
- Unequal heating creates pressure differences; air accelerates down the pressure gradient, while Coriolis and surface friction alter its speed and direction.
Effects / significance
- Geostrophic wind balances pressure-gradient and Coriolis forces above the friction layer.
- Sea breezes develop when land heats faster than adjacent water during the day.
- Application: The southwest monsoon is a seasonal wind system driven by land-sea thermal contrast.
Geography connection
The southwest monsoon is a seasonal wind system driven by land-sea thermal contrast. This illustrates how winds varies by location, scale or environmental context.
Bangladesh connection
Bangladesh receives moist southwest monsoon winds from the Bay of Bengal, with seasonal reversals in the wider monsoon system.
BCS preliminary facts
- Wind direction is named for where it comes from.
- Geostrophic wind balances pressure-gradient and Coriolis forces above the friction layer.
- Sea breezes develop when land heats faster than adjacent water during the day.
BCS written analysis
Build an analytical answer
- Wind is the horizontal movement of air, driven primarily by pressure-gradient force and modified by rotation and friction.
- Unequal heating creates pressure differences; air accelerates down the pressure gradient, while Coriolis and surface friction alter its speed and direction. Use the southwest monsoon is a seasonal wind system driven by land-sea thermal contrast. as a named application in a comparative answer.
Common misconceptions
- Wind direction is not named for its destination.
- Coriolis changes direction but does not create the pressure gradient.
BCS PRACTICE ENGINE
Test Your Knowledge
Select the best answer, then check your response.
Winds: which statement correctly applies pressure gradient to this topic?
Quick revision
- Winds
- Wind direction is named for where it comes from.
- Geostrophic wind balances pressure-gradient and Coriolis forces above the friction layer.
- pressure gradient / Coriolis force
- Definition → process → spatial example