Ocean changes will cool Europe

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Ching, Neko, Jade, Mimi, Ching, Neko, Jade, Mimi, Eva, Syrina, LydiaEva, Syrina, Lydia

Ocean changes will cool Europe

The scientist say that:The scientist say that:

Ocean currents in Atlantic may cool Ocean currents in Atlantic may cool European weather in a few decadesEuropean weather in a few decades

The currents from the gulf steam are The currents from the gulf steam are weakening, Bringing less heat north.weakening, Bringing less heat north.

Atmospheric Radiator

After the Caribbean(15N, 75W) emerges After the Caribbean(15N, 75W) emerges from the equator, it splits into two parts:from the equator, it splits into two parts:

1.Heading north east to Europe1.Heading north east to Europe 2.Circulating back through the tropical 2.Circulating back through the tropical

AtlanticAtlantic

The first part

As the north eastern branch flows, it gives As the north eastern branch flows, it gives off heat to the atmosphereoff heat to the atmosphere

Which in turn warms European LandWhich in turn warms European Land It reaches the northern latitudes around It reaches the northern latitudes around

Green and Iceland.Green and Iceland.

The normal condition of the first part

After it splits into two parts, the first part After it splits into two parts, the first part heading north east to Europeheading north east to Europe

The water has cooled so muchThe water has cooled so much So it sink towards the ocean floor (hotcold)So it sink towards the ocean floor (hotcold) This process know as “overturning”This process know as “overturning” This cooler water heads south, forming the This cooler water heads south, forming the

return steam of a conveyor beltreturn steam of a conveyor belt

The complete cycle:

1. 1. Warm water coming northwards on the Warm water coming northwards on the ocean’ surfaceocean’ surface

2.Cold water returning hundreds and 2.Cold water returning hundreds and thousands of metres underwaterthousands of metres underwater

It has constant over the last 50years.It has constant over the last 50years.

The change of first part

30% 30% decline in the southwards flow of deep decline in the southwards flow of deep cold watercold water

= less overturning= less overturning

World map 1.docWorld map 1.doc

World Map

The first evidence

Computer models of climate shows that the Computer models of climate shows that the north Atlantic conveyor maynorth Atlantic conveyor may

1.Reduce in intensity1.Reduce in intensity 2.Turn off altogether2.Turn off altogether

What happens are that as Arctic ice melts and Arctic rivers flow faster?

1. 1. The northern oceansThe northern oceans Less saline because arctic ice meltsLess saline because arctic ice melts Less salinity= a lower densityLess salinity= a lower density Waters then cannot sinkWaters then cannot sink Conveyor weakensConveyor weakens If it turned off completely, Europe would If it turned off completely, Europe would

cool by perhaps 4 -6 ℃ ℃cool by perhaps 4 -6 ℃ ℃

Conclusion

Every things happened must have causality.Every things happened must have causality. Here is the chain.Here is the chain. Greenhouse effect Arctic ice melts less Greenhouse effect Arctic ice melts less

salinity in the ocean lower density waters salinity in the ocean lower density waters cannot sink conveyor weakens The heat cannot sink conveyor weakens The heat could not been bought to the northern could not been bought to the northern hemisphere from the equator by the ocean hemisphere from the equator by the ocean currents The weather will become coldcurrents The weather will become cold

Reflection

After we have done this project. We realize that we After we have done this project. We realize that we shouldn't waste our natural resources because shouldn't waste our natural resources because everyone must pay for anything that they have everyone must pay for anything that they have done. For example, human need to pay for the done. For example, human need to pay for the pollutions, such as this problem.pollutions, such as this problem.

We hope that everyone can understand reason.We hope that everyone can understand reason.

Thank you! Thank you!

Sources

BBC news---Science nature:BBC news---Science nature:

http://news.bbc.co.uk/1/hi/sci/tech/default.stmhttp://news.bbc.co.uk/1/hi/sci/tech/default.stm A film: The day after tomorrowA film: The day after tomorrow