Bjerknessenteret for klimaforskning er et samarbeid mellom Universitetet i Bergen, Uni Research, Nansensenteret og Havforskningsinstituttet. 

Nettmøte: Golfstrømmen

Hva er golfstrømmen? Hvor kommer den fra? Hvilken betydning har den for klimaet vårt? Forsker Anne Britt Sandø svarer på nettmøte 3. mai.

Hvor mye varme bringer golfstrømmen med seg? Hva er det som driver Golfstrømmen? Hva skjer med Golfstrømmen under forventede klimaendringer?

Les svarene til forsker Anne Britt Sandø på Bjerknessenteret  på ArnesenBancroft her eller se nedenfor: 





Gulf Stream
Anne Britt Sandø, Bjerknes Centre for Climate Research

Gulf Stream Turn
Ivan, 2007-05-03 09:02:40.0

Can Gulf Stream turn (say near Greenland) in the future and go back to Atlantic and not flow in Barentz Sea? What are consequences of such turn? Thank you
There are no indications that such a dramatic change will take place within the next decades, and likely not in this century. Model studies show that if the Arctic Ocean is exposed to 4 times as much freshwater (due to melting of ice) as it is today, the Gulf Stream will initially be reduced by about 30% before it slowly recovers again. Such a change will involve rather big reductions in the ocean heat transport to the Nordic and Barent Seas, but it is expected that the global warming will more than compensate for this. It will therefore be a net warming in these areas as well.

Anne Britt
global warming
Devin, 2007-05-02 21:49:38.0

Is that sure what is going to happen?
Global warming has unfortunately already started and is evident from increases in global air and ocean temperatures, melting of snow and ice, and rising sea level. Eleven of the last twelve years rank among the 12 warmest years in the instrumental record of global surface temperature. The increase in temperature has been 0.74ºC from 1906 to 2005. Models that are able to reconstruct this increase in temperature as a consequence of anthropogenic (human made) emissions of greenhouse gases show that the warming will continue throughout this century.

Anne Britt
Clare, 2007-05-02 11:27:15.0

Is the Gulf Stream driven by density differences between seawater in tropical regions and polar regions, as they teach us in school, or is the Gulf Stream driven by winds? I heard one researcher claiming that "the Gulf Stream is safe as long as the earth turns"...
Both density differences and winds drive the Gulf Stream. Paleoclimate records indicate that the strength of the Gulf Stream has varied quite a lot, probably related to density differences between seawater in polar and tropical regions.

Anne Britt
Karl, 2007-05-01 20:23:45.0

Statistisk går vi nå sansynlig mot en nedkjøling i arktis, det salte vannet som følge av det varme vannet nå vil vel gi golfstrømmen en kraftig dytt når dette avkjøles og kansje også ta med seg større mengder CO2 til dypet ?
Salt er viktig for dypvannsdannelsen i De nordiske hav, men det er også temperaturen. Det forventes at temperaturen på jorden vil fortsette å stige, og da spesielt i de arktiske områdene. Dette vil føre til økt smelting av is som ventes å hemme dypvannsdannelsen til en viss grad. Dette kan igjen føre til redusert innstrømning av varmt og salt vann fra sør til våre områder. Likevel ventes det at den globale oppvarmingen vil bli større enn effekten av en redusert Golfstrøm, slik at vi på sikt vil få det varmere her i Norden. Ettersom havets opptak av CO2 reduseres med økende temperatur, kan vi ikke forvente et økt opptak med det første. Tvert imot forventer vi at havet vil gradvis ta opp en mindre og mindre andel av den CO2 vi tilfører atmosfæren.

Anne Britt
global warming
agness, 2007-05-01 19:27:25.0

what an i do to provent global warming?
To reduce global warming it is important to reduce the burning of fossil fuels. This can be done e.g. by driving less cars, taking less trips by planes, reducing consumption of products from the other side of the world, and using less energy for heating and lighting in our homes, schools and offices.

Anne Britt
Why is
Sian, 2007-04-28 13:05:59.0

Why is the Arctic ocean so important to people?
The Arctic Ocean is important for the people living there because of the local communities dependence on fishing and hunting. In addition, the Arctic Ocean plays an important role in the global ocean circulation. Deep water is formed in the Arctic Ocean, and this production is one of the main reasons for warm waters to be brought northwards. These warm waters, together with warm air masses, give the unique and mild climate in the northwestern parts of Europe. The Arctic Ocean is also important for its biomass production and for its uptake of atmospheric CO2.

Anne Britt
Adrienne Kusek,9, 2007-04-28 02:30:20.0

do you think pengins will be in the South Pole?
Penguins live in Antarctica, and there is no reason to believe that this will change in the foreseeable future.

Anne Britt
global warming
amber 14, 2007-04-27 23:46:46.0

how can I help stop global warming?
You can help stop global warming by using less fossil fuels (driving less cars, taking less trips by planes, reducing consumption of products from the other side of the world, using less energy for heating and lighting in our homes, schools and offices). Set a good example to your friends and family!

Anne Britt
why did they do it???????
liz, 2007-04-27 22:09:51.0

why would any one want to do this 4 fun??????
Have a look at:

Anne Britt
kamarielle king, 2007-04-27 00:30:31.0

how old whould liv arnesen be today.
Liv Arnesen is 53 years old.

Anne Britt
global warming
taylor, 2007-04-26 16:53:31.0

do you think global warming is effecting our future?
I'm afraid that global warming will affect large parts of the world and that many people will suffer as a consequence of droughts in subtropical regions (for instance at the latitudes of North Africa and the Mediterranean in the northern hemisphere, and South Africa and Australia in the southern hemisphere), insufficient supply of melting water during summertime as mountain glaciers (e.g. in Tibet) disappear, heavy rainfall events and floods, increasing sea level etc. On the other hand, in some areas global warming will lead to a more pleasant climate with longer growth season etc.

Anne Britt
Global Warming
Alec Hinton, 2007-04-26 16:51:08.0

Why isnt going away?
Global warming is a consequence of anthropogenic (human made) emissions of greenhouse gases to the atmosphere. Even if we were able to reduce or stop the emissions of these gases now, the warming will continue for a century or more due to the long life of some of these gases. Also, the temperature of the world oceans increases. Eventually, this heat will come back to the atmosphere, leading to elevated atmospheric temperatures for long times (a century and more).

Anne Britt
the ice
ashurna moses, 2007-04-26 16:38:51.0

how thick is the ice? what is the most coldest wheather? do it has hot sun? Is it as big as the space? do people live there? when will the ice melt and will it have land? why do it have ice threr in the frist places? when it melts will the water rise up? do people live there a long time ago like the cave man? how did the water froze? if it is thin why do ithave moutains on it?
The average thickness of the sea ice in the Arctic is about 10 ft (3 m), the coldest temperature was -94ºF (-67.8ºC) at the village of Verkhoyansk, Siberia, it has sun in the summertime and the temperatures are then around 0ºC. It is not as big as space and people live there. It is expected that the Arctic will be ice free during summertime at the end of this century. There is no land below the ice at the North Pole, and there is ice in the Arctic because seawater freezes at -1.8ºC.

Anne Britt
why end what.
natalia velasquez., 2007-04-26 16:33:21.0

what can we do about global warming.
To reduce global warming it is important to reduce the burning of fossil fuels. This can be done e.g. by driving less cars, taking less trips by planes, reducing consumption of products from the other side of the world, and using less energy for heating and lighting in our homes, schools and offices.

Anne Britt
Marissa Renae Alford, 2007-04-26 16:32:56.0

When did you get back?
Ann Bancroft and Liv Arnesen suspended their expedition to the North Pole March 12th, citing severe safety concerns due to a combination of damaged gear, frostbite and extreme cold.

Anne Britt
global warming
alexis martinez, 2007-04-26 16:18:50.0

How can I help to stop global warming?
Have a look at

Anne Britt
global warming
nadia, 2007-04-26 16:16:05.0

how many days does global warming last
The length and strength of global warming depends on our future emissions of anthropogenic (human made) greenhouse gases. Even if we stopped the emissions today, global warming would continue for several decades due to the long lives of greenhouse gases in the atmosphere.

Anne Britt
about global warming
frankie, 2007-04-26 14:45:53.0

When do you think the Earth is going to be all under water?
The Earth is not going to be all under water! The global sea level will likely increase by between 1.5-3 ft (0.5-1 m) this century. This is caused by warmer oceans and that glaciers melt. If the entire Greenland Ice Sheet melted, this would contribute to a sea level rise of 7 meters. It is not likely that the entire Greenland Ice Sheet will melt, but we expect partial melting of the ice on Greenland.

Anne Britt
jaremyfisher price, 2007-04-24 22:13:51.0

whats the point of ice?
The ice is important for several reasons. One of them is that it prevents warming of the ocean as energy from the sun is reflected by the ice, back to the atmosphere and space. Production of ice is also important for the deep water formation that takes place in the Arctic Ocean. Another reason is that polar bears are dependent on the ice for hunting seals etc.

Anne Britt
chandler, 2007-04-24 15:48:54.0

which countries are witin the artctit circle
The countries that are within the Arctic Circle are: Canada, Denmark (including Greenland and the Faroe Islands), Finland, Iceland, Norway, Russia, Sweden and USA.

Anne Britt
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