{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter10a

# Chapter10a - The General Circulation of the Atmosphere...

This preview shows pages 1–7. Sign up to view the full content.

The General Circulation of the Atmosphere

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
RECAP
What we need to know for today Pressure gradient force: from H igh to L ow pressure Coriolis force (effect): Results from the rotation of the planet. Maximum at the poles and no effect at theequator. Acts perpendicular to the direction of motion: changes the direction of the wind but not the wind magnitude. In the NH deflects the wind to the right. In the SH deflects the wind to theleft. Winds aloft Balancebetween the pressure force and the Coriolis force. The wind is parallel to the isobars. Surface winds Balancebetween the pressure gradient force, theCoriolis force and theair friction. The wind crosses theisobars (from H igh to L ow pressure).

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Surface Winds- a balance of three forces In the boundary layer (~1km thick) friction is important ! Friction is acting opposite thedirection of the velocity -> friction reduces the wind speed -> the Coriolis force becomes weaker -> it cannot balance the pressure force. The wind starts to blow across the isobars towards the low pressure The anglebetween the direction of thewind and the isobars is on average30 deg (Buys- Ballot’s law). It depends on the topography.
Average Wind Structure The direction and the magnitude of thewinds at a given location can vary significantly during theday, and from day to day. The general circulation (GC) refers to theaverage(the prevailing) winds on a global scale(around the world). The GC of theatmosphere is the result of theuneven heating of the Earth’s surface. It is impacted by theEarths rotation. The GC transports and redistributes energy from oneregion to another (warm air towards the poles and cold air towards theequator).

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
The Single Cell Model This is a very simplified model based on the following threeassumptions: 1.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 19

Chapter10a - The General Circulation of the Atmosphere...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online