The Influence Of Global Warming On Desertification

Department of Civil and Environment System EngineeringUniversity of Incheon, South Korea

2200919 박 치 만

Contents

Background and Purpose of Study

Definition of Desertification

Mechanism of Desertification

Summary

Air Environment Engineering 2

Background & Purpose of Study

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Average temp. of the earth goes up due to global warming gas like car-bon.

The climate change become bigger.

Extremely high temperature or

heavy rain.

Arid area expends.(Desertification)

Definition of Desertification

The phenomenon that arid land is changed into desert by various causes like climate change and human activity

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Desertification

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6

Desertification

Air Environment

7

Desertification

Air Environment

Mechanism Of Desertification

Drought

Deserti-fication

Albedo↑

De-scend-

ing cur-rent

Global

Warming

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The Damage of Global Warming

Increase the number of extremely hot and cold days Temperature rising accelerates hydrologic cycle, so a drought and a flood have become more frequently, extremely.

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Albedo Rising Albedo - Overall average reflection coefficient of an object

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Surface Albedo(%)

Desert(sand) 30~60

Crops(Green) 5~25

Forest(Green) 5~10

Grassy plain(Green)

5~25

Farm land 14~17

Soil(Dark) 5~15

Soil(Bright) 25~30

Desert emits energy as long wave radiation more than forest and crops, due to its high temperature and albedo.

Temperature of air over desert goes down, and then descending current begin.

Ascending & Descending air current

High pressure area is clear, because air is compressed as it drops.

Low pressure area is cloud, because air swells as it ascends.

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Summary 1

Desert Surface( Albedo: 30~60%)

Upper Air(Emitting radiation energy >Absorbing energy )

① Solar radiation

100

③ Temperature

④ Descending air current

70

60

⑥ Extension of Desert

⑤ No rain , no cloud = clear

② Earth radiation

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Summary 2

During descending air current, volume of air de-crease, so temp. of air goes up due to adiabatic change.

Owing to continued descending air current, desert isn’t rain, more and more it becomes arid and expands.

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14Air Environment

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