QUOTE(firefemme1202 @ Nov 16 2004, 12:45 PM)
QUOTE(seeking @ Nov 14 2004, 08:22 PM)
isnt it true that if you put say 3 ice cubes in an empty glass and then fill that empty glass all the way up to its brim and leave it out in the sun all day, that the water level will drop (assume that evaporation is not taking place) as water in a solid form takes up more space than water in liquid form, because if that is the case, the only thing that is going to happen to earth when the polar ice caps melt is the sea level will actually drop
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This is true, the reason the ice floats is because it's buoyant with air pockets, as the ice melts, the air is released to the glass would be less full. However, I'm not quite sure about the effects it would hold on our Earth.
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QUOTE(Stellar @ Nov 16 2004, 02:21 PM)
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im pretty sure though what i said would be the case
That is not necessairly the case. A solid is more compressed than a liquid, and a liquid more than a gas. Sure, you can have air in an ice cube which would occupy space... you could even make a hollow ice cube if you wanted to... but the polar ice caps are a bit different. The amount of air that would be released would be miniscule compared to the rising water level because of the melting IIRC... and it seems Im right because most major scientists studying this are worried about the sealevel rising...
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That's true, ice in a glass of water is no comparison to the bergs in the ocean in which land and temperature levels and evaporation is involved.
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Ice-sheet insanity. Melting glaciers are but a trickle of water on the planetary scale. They're small change compared to the West Antarctic Ice Sheet, which holds 3 million cubic kilometers of fresh water. Were it to melt, sea level would rise 20 feet, and coastal cities, not to mention beaches, would be in tough shape.
Let me make one thing perfectly obscure
Ice shelves melt all the time, "calving" icebergs that, no matter how enormous, do not effect sea level. Because floating ice displaces the same volume of water as melted ice, iceberg that formed from floating ice on Antarctica's vast ice shelves add no volume to the ocean.
But when ice cascades off land, it does increase the volume of the oceans.
I pulled this quote from this
SiteIt has a lot of other interesting information, but it relates to the Antarctic...however I'm sure the information would be useful regarding the Arctic as well.
However, this
Site has a large amount of interesting and credible information regarding the Arctic, a large number of pictures that show ice thickness, north pole trends, rising and lowering temperatures all over the arctic and more. In the article, it says that sea ice has declined by over a third in the last 130 years. Also,
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Klaus Toepfer, Executive Director of the United Nations Environment Programme (UNEP), said:"We have, during the last half of the twentieth century, seen sea ice in the region disappearing at a rate of nearly three per cent a decade".
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Increased snow and rainfall and widespread melting of ice and permafrost may lead to higher levels of freshwater entering the Arctic Ocean. This freshening of the Arctic Ocean could have important impacts on ocean circulation. The formation of sea ice, which leads to salty, heavy water, sinking down deep into the ocean, also plays a key role in driving deepwater currents which in turn affect weather patterns and climate across the globe.
Here are the results that are expected (If Bush doesn't care about Greenland now, he'd better hope someone cares about America when Louisianna and Florida start to go underwater):
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“The impacts of global warming are affecting people now in the Arctic,” says Robert Corell, chair of the ACIA. “The Arctic is experiencing some of the most rapid and severe climate change on earth. The impacts of climate change on the region and the globe are projected to increase substantially in the years to come.”
Highlighted Findings
• In Alaska, Western Canada, and Eastern Russia average winter temperatures have increased as much as 4 to 7°F (3-4°C) in the past 50 years, and are projected to rise 7-13°F (4-7°C) over the next 100 years.
• Arctic sea ice during the summer is projected to decline by at least 50 percent by the end of this century with some models showing near-complete disappearance of summer sea ice. This is very likely to have devastating consequences for some arctic animal species such as ice-living seals and for local people for whom these animals are a primary food source. At the same time, reduced sea ice extent is likely to increase marine access to some of the region’s resources.
• Warming over Greenland will lead to substantial melting of the Greenland Ice Sheet, contributing to global sea-level rise at increasing rates. Over the long term, Greenland contains enough melt water to eventually raise sea level by about 23 feet (about 7 meters).
• In the United States, low-lying coastal states like Florida and Louisiana are particularly susceptible to rising sea levels.
• Should the Arctic Ocean become ice-free in summer, it is likely that polar bears and some seal species would be driven toward extinction.
• Arctic climate changes present serious challenges to the health and food security of some Indigenous Peoples, challenging the survival of some cultures.
• Over the next 100 years, climate change is expected to accelerate, contributing to major physical, ecological, social, and economic changes, and the Assessment has documented that many of these changes have already begun.