SAHARA 5000 YEARS AGO

Maquinghen Arnaud

Teacher : Chris Yukna

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TODAY

Without external water

Day : 50°C

Night : -10°C

More than 1 million tonne

of dust particles

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MIT SEARCHING

Sahara transformate to its current state 4900

years ago.

MIT’s research : quantity of dust and the

aridity are proportionnal

Studying Algeria, Mauritania and Senegal

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USING MARINE SEDIMENTS

Quantifying the number of mineral particles

of ground origin present in marine sediments.

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STORY OF SAHARA DURING HOLOCENE

Wet period : 11800 to 5800 years ago

Dust particles 7000 years ago was 5 time

lower than those last 2000 years.

Oceanic slope of north Africa

Uranium-thorium method

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SAHARA MORE THAN 5000 YEARS AGO

Sahara was covered with meadows and not

with savannas or with deserts as today

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CONCLUSION

Sahara changed quickly

This method can help us to understand and

predict our current climate-change.

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THANK YOU FOR YOUR ATTENTION

Question ?

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