Warm-up • Page: 528, 1. What is the major wind belt that is nearest

the equator?

Trade winds

• Page: 528, 2. What is the major wind belt that the most of the USA belongs to: ________________________

Prevailing westerlies

• Page: 528, 3.What direction do the winds from the polar regions come from?

east

Warm-up • Page: 527, 1. The Circulation of the atmosphere and the

oceans is affected by the _______ of the Earth on its axis.

rotation

• Page: 527, 2. The tendency of moving objects to follow curved paths rather than straight line due to Earth rotation is called the ____________ ____________

Coriolis effect

• Page: 528, 3. Looping patterns of air flow as hot air rises, and cool air sinks is called an ___________ _________

Convection cell or current

Warm-up quiz 1. The fraction of solar radiation reflected from an object is

called the ________________.

2. The transfer of energy as heat from one substance to another by direct contact is called_________.

3. What layer of the atmosphere do we live in ?

4. What is the major wind belt that most of the USA belongs to: ________________________

5. The Circulation of the atmosphere and the oceans is affected by the _______ of the Earth on its axis.

Objective: S.W.B.A.T.• Describe the global patterns of air circulation, and

name three global wind belts.

• Identify two factors that form local wind patterns.

• Explain the Coriolis effect.

• Create a model and booklet on global wind patterns

• Show how energy and matter flow in cycles in wind belts

• Use model booklet to answer question related to wind belts

Activities:

• Warm-up

• Creat wind belt book

• Complete questions

• Color code wind belts

• Communicate information/questions answered

Atmospheric CirculationSec. 19-3

How Air MovesDifferences in air pressure are caused by unequal

heating of Earth’s surface.(causing convection)

Hot air is rising at the equator –creating a low pressure area.

Cold air is sinking at both poles –causing high pressure areas.

Air moves from areas of high pressure to areas of low pressure, causing a general, worldwide movement of surface air from the poles toward the equator. This, along with the Coriolis effect, creates wind patterns.

The Coriolis EffectCoriolis effect - the curving of the path of a moving

object from an otherwise straight path due to Earth’s rotation

The Coriolis effect causes winds to be deflected by Earth’s rotation. http://wn.com/What's_t

he_Coriolis_Effect?__Winds__BBC_Fou

Global Winds

Each hemisphere contains three looping patterns of flow called

convection cells.

Global WindsEach convection cell

correlates to an area of Earth’s surface, called a wind belt, that is characterized by winds that flow in one direction.

These winds are called prevailing winds.

Winds are named from where the come from

1st Global Wind Belt1. Trade Winds – the prevailing winds that blow from

east to west from +/- 30º latitude to the equator in both hemispheres

Inter-Tropical Convergence Zone

Trade Winds

Trade Winds

Doldrums – area of rising air at the equator, where the surface winds are weak – Sailing vessels sometimes would get trapped of days.

2nd Global Wind Belt2. Westerlies - prevailing winds that blow from west to

east between 30º and 60º latitude in both hemispheres

Intertropical Convergence Zone

Trade Winds

Trade Winds

Westerlies

Westerlies

Polar Easterlies

Polar Easterlies

Global WindsJet Streams are a narrow band of strong winds that

blow in the upper troposphere & lower stratosphere

These wind exist in the Northern and Southern Hemispheres. – they direct paths of weather

3rd Global wind belt 3. Polar easterlies – caused by cool air descending (sinking) from the poles and is turned by the Corioliseffect.

• Winds move from east to west

Global Winds

Cool down1. The doldrums are located between what

wind belts in north and south?

Trade winds

2. What are the names of the bands of high winds in the upper troposphere that are created from the global wind pattern

jet streams