STARTER

Review homework on GIS Posters.

In pairs can you think of 3 factors that will cause the climate to change?

Definition of Climate: the long term average of the weather, usually over 30

years, for a large region.

Local and Global Causes of Current Climate Change

To be able to understand causes of climate change.

LEARNING OBJECTIVE

1) To be able to describe climate change since the last Ice Age.

2) To understand External and Internal factors which affect climate.

3) To apply current causes of climate change with detail to local and global scales.

LEARNING OUTCOMES

To be able to describe climate change since the last Ice Age.

• Use the graph below to HOLT describe the changes. You must refer to axis data and the period names.

LEARNINGOUTCOME 1

To be able to describe climate change since the last Ice Age.

• Add these annotations to the correct sections of the graph on the next page. Indicate your HOLT sentences.

LEARNINGOUTCOME 1

Temperature has increased by 6oC since

the last Ice Age.

The temperature is predicted to increase more rapidly in the

future.

The Little Ice Age was where the

temperatures were below the long-term

average for 600 years.

This was a period of rapid rise (put the year data in the

sentence).

There have been several periods of

fluctuation.

Refer to some axis data in each sentence.

Temperature has increased by 6oC since

the last Ice Age.

This was a period of rapid rise (put the year data in the

sentence).

The Little Ice Age was where the

temperatures were below the long-term

average for 600 years.

There have been several periods of fluctuation.

The temperature is predicted to increase more rapidly in the

future.

What data could we add to each box?

To understand External and Internal factors which affect climate.

• Arrange then copy these definitions.

LEARNINGOUTCOME 2

EXTERNAL FACTOR

A CHANGE THE HAPPENS BECAUSE OF THINGS OUTSIDE THE

EARTH.

INTERNALFACTOR

A CHANGE THE HAPPENS INSIDE THE

EARTH’S ATMOSPHERE.

To understand External and Internal factors which affect climate.

• Watch the following clip and list any external and internal factors of climate change are shown.

LEARNINGOUTCOME 2

To understand External and Internal factors which affect climate.

Order one from each of the following – Factor + Detail + Diagram. Remember to also state if it is External or Internal.

LEARNINGOUTCOME 2

SURFACE REFLECTION

VOLCANIC ACTIVITY

ORBITAL GEOMETRY

CHANGE IN ATMOS. GAS

SOLAR OUTPUT

TECTONIC ACTIVITY

ORBITAL GEOMETRY

Large amounts of sulphur dioxide and ash reduce solar radiation reaching the

surface. E.g. 1815 Mt. Tambora.

The Earth’s tilt changes from 21.5 o (less extreme) to 24.5 o (even hotter summers, even colder winters) every

41000 years.Movement of the continents affects atmospheric and oceanic circulation.

Large amounts of sulphur dioxide and ash reduce solar radiation reaching the

surface. E.g. 1815 Mt Tambora.

More carbon dioxide increases the greenhouse effect which makes the

Earth 15oC. Otherwise we’d be -18oC.

Variation from circular (colder) to elliptical (warmer) every 95000 years.

More ice reflects more solar radiation so temperature drops leading to more

ice. Then vice versa.

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To apply current causes of climate change with detail to local and global scales.

Read pages 15 and 16 and list the global causes and local causes with specific detail.

LEARNINGOUTCOME 3

Click the image to watch a clip about Global warming. We are mostly interested in the Greenhouse effect. Take some crucial notes.

PLENARY

• What do you understand from this mnemonic about climate change

factors?

C A TI

S S O X

• Now complete and mark the exam question