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Global warming raise sea levels?

  1. Apr 6, 2005 #1
    I know this may sound extremely silly... but, all ice at the north pole is floating... creating mass that would make the ocean higher than it would be... would that ice not be there, when ice melts it takes up less volume than when it is frozen? How would the north and south poles melting raise sea levels "dramatically" , yes i know this will sound silly to a lot of you, but i'm serious! can anyone give me a solid answer? I can see how it would effect our weather, causing different currents in the ocreans, but coastal flooding, really a huge deal? maybe only on a small scale? and wouldn't a small percentage of that melted water be evaporated into the atmosphere(which would keep sea levels down slightly), and become clouds? creating more chaotic weather, and different weather patterns? and fill up old dry lake beds and seas that have since dried uop with new water, displacing water fairly equally throughout the globe?
     
    Last edited: Apr 6, 2005
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  3. Apr 6, 2005 #2

    matthyaouw

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    I think get where you are coming from. I believe its true that floating ice takes up no more volume than the water would, due to the portion above the surface, so melting of floating ice won't cause sea level rise. The ice sheets that pose problems are the Greenland and Antarctic, as these are almost entirely on land and displace no sea water as they are.
     
  4. Apr 6, 2005 #3
    Thanks, i see this on the news everyday being discussed by top scientists etc... and it erks me, because i am a 20 year old 5 year highschool student... it seems they miss things? Yes i know polution is a problem, but if that's what they are trying to get at, then adress it honestly so people take you seriously? Thanks for understanding, yes i agree the ice sheets are the big problem, but are they really enough to cause GLOBAL coastal flooding, after displacing water in deserts because of new weather patterns? Like i always tell people, we should fear the next ice age more than global warming :) Don't get me wrong, i am not in any way saying we should ignore it, because it is still part of the unknown.
     
  5. Apr 6, 2005 #4

    matthyaouw

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    Its a bit speculative to say that melting ice would be counterbalanced by increased precipitation in deserts, because the amount of water stored at the poles is tremendous, and if anything, I think deserts are expanding and droughts becoming more frequent, plus any water that lands on a continent will make it back to the sea in a relatively short time.
    There are a lot of good threads around this section on global warming, I reccomend you check them out.
     
  6. Apr 6, 2005 #5
    Hi,

    I have read that if all the ice in the world melted, sea levels could rise hundreds of feet. This in and of itself wouldn't increase precipitation.

    However, increased evaporation due to global warming would. This could magnify the GW effect since water vapor is itself a greenhouse gas. This would mean more precipitation and more global warming.

    The result could mean a hotter more humid earth. And, since temperature (especially ocean temperature) is a major driver of storm intensities, this could reult in more dangerous and devasting storms.

    juju
     
    Last edited: Apr 6, 2005
  7. Apr 7, 2005 #6
  8. Apr 7, 2005 #7
    haha yes, it seems our thought processes revolve on a quite even playing field... i read that whole topic, and it is exactly the way i feel.. although i never talk about it, because isntantly i am laughed at and become "the enemy". It doesn't take much thought and common sense to see what the real threats are and aren't. Polution is a real threat, i guess the only way they try and get it across to the masses is to say that they're homes will be flooded under 300 feet of ocean if they continue to drive cars.
     
  9. Apr 7, 2005 #8
    It seems a lot of people who go on about melting ice cube not raising the level of water in a glass point are missing something.

    That is, there's a whole lot of ice sitting on Greenland and Antartica, and it'll be melting too.

    Plus there's a whole lot of important species and peoples that depend on the polar ice caps now.
     
  10. Apr 7, 2005 #9
  11. Apr 7, 2005 #10
    i agree, it's a misfortune, and the Earth was not intended to be treated this way, that is and should be the real message. I agree the ice sheets melting on land may or may not have some effect, we just do not know, there are so many tings you could say to scare people, but on the other hand there are so many things yoiu could say that would counter it, so who's to believe? I can write a book saying how the warm environment will bring deserts to life, and fill dried seas and lakes, and that the highest mountains will gather more ice from global warming, isn't that all this is about, it hasn't happened, no one knows what will happen, so instead of going by the real facts, that pollution is bad and the earth was not meant for it, we make predictions that may ofr may not be false, so we can scare people into stopping what they are doing... maybe that's the best way to go about, but i prefer truth over speculation, i could also sit here and give you lots of stats and surveys and records, but it doesn't mean a thing.... they said global warming would cause the globe to warm by 5 degrees on average... is it really that big of a deal? Why don't we start talking about what it's going to do to the future evolution of humans, the chemicals causing deformities in both humans and animals. i say we stick to the truth, the earth was not meant to have so much exhaust and chemicals flying around in its atmosphere, so we should stop using them... the ice sheets flooding is always a possibility... but we only pick it because it's the worst case scenario, and it will scare the heck out of people... and of course everyone jumps on the band wagon.
     
  12. Apr 9, 2005 #11
    Another factor to mention is that the ice reflect the sun beam, and we get much less infrared radiation from those areas. But i don't know how much this reduce the global warming.
     
  13. Apr 9, 2005 #12
    It's time that scaremongering should be considered a mis conduction. Unfortunately, it's a requirement of the society

    A cutting edge reseacher: Tod Alberts:

     
  14. Apr 10, 2005 #13
    scientists... be wary... global warming and freezing occurs when IT wants to, us humans are merely a bi-product of this great universe. stop pollution... adapt to your changing earth.
     
  15. Apr 14, 2005 #14

    Phobos

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    It's clear that the sea levels have changed quite a bit throughout the Earth's history (e.g., consider the oft-cited example of the Bering Strait). And although I don't have the data handy, I assume sea levels corrolate very well with the amount of polar ice (the water must go somewhere).

    Not sure we can call those facts. "Pollution" is subjective (e.g., one creature's waste is another's food) and we know of no higher purpose for the Earth other than through religious faiths. The real question is what kind of future do we want (i.e., what kind of future is healthy for us and how do we achieve that)?

    We make the best predictions we can and make decisions based on that (and then collect more data & make revised predictions to make revised decisions...etc.). Certainly scaremongering is out there as well as ignoring warning signs, but there can be a healthy scientific/political debate on it.

    Yes. The difference between an ice age and current conditions is only about 5 to 8 degrees C (it's a global average).
     
  16. Apr 14, 2005 #15

    Phobos

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    Well, that's a big part of the debate...to what degree are humans affecting the climate/planet. I'd say it's non-zero, but I couldn't tell you to what degree it is. Much of the "scaremongering" can come from the uncertainties in what will happen from our actions.
     
  17. Apr 17, 2005 #16
    Not really :wink:

    http://www.cuba.cu/ciencia/citma/ama/museo/exmari.htm

    http://geology.geoscienceworld.org/cgi/content/full/30/4/379

    Indeed the assumed mechanism of the ice age of ~10 difference is based on three indicators, the borehole temperature in the remaining holes of the Greenland ice sheet and only there) and the changing isotope ratios in the ice cores as well as oceanic sediment cores. And the signs of waxing and waning ice sheets.

    Detailed investigation reveals that's nothing is what it looks like.
     
    Last edited: Apr 18, 2005
  18. Apr 18, 2005 #17
    That second link seems dead. Here is the abstract of that paper:

    So what do you think, should we do new studies?
     
  19. Apr 18, 2005 #18

    Phobos

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    I meant on a global scale/global average (local variations are to be expected).
     
  20. Apr 19, 2005 #19
    Yes of course and there is no doubt that the late Pleistocene ice sheets Cordilleran, Innutian, and Laurentian from America and the Weichselian and Würm glaciations have dissappeared and have caused a world wide (eustatic) sea level rise. However the only places where nice correlating paleao sea levels are found is in the East Carribean and around Indonesia. . The corals of Barbados are famous for that. Also the North sea and the Beringia land bridge dissappeared. On other places however, like October revolution Island north of Siberia, young -not petrified- fossil remains of Beluga whales are found 100 meters above sea level.

    So it's seems not to be the whole story.
     
  21. Apr 19, 2005 #20
    Take this for instance:

    And no ice sheet around in millions of years. So isostatic rebound after glaciation is not a factor.
     
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