Jump to content




Welcome to Unexplained Mysteries! Please sign in or create an account to start posting and to access a host of extra features.


- - - - -

Rising oceans


  • Please log in to reply
8 replies to this topic

#1    Aristocrates

Aristocrates

    Extraterrestrial Entity

  • Member
  • PipPipPip
  • 464 posts
  • Joined:02 Mar 2006
  • Gender:Male

  • A brother Seamus? Like an Irish monk?

Posted 13 April 2006 - 08:27 PM

huh.gif Im a little puzzled at how the ice caps melting would make our oceans rise. Would it not make sense that the caps work like ice cubes and therefore when they melt our oceans would actually fall to lower levels instead of rise to higher levels blink.gif

If you don't claim your humanity you will become a statistic.

#2    Pax Unum

Pax Unum

    < 420 Conspirator >

  • Member
  • 18,841 posts
  • Joined:06 Feb 2006
  • Gender:Male
  • Location:Suburbia

  • "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle

Posted 13 April 2006 - 08:38 PM

in the last 100 years the earth's temperature has increased about half a degree Celsius. This may not sound like much, but even half a degree can have an effect on our planet. According to the U.S. Environmental Protection Agency (EPA) the sea level has risen 6 to 8 inches (15 to 20 cm) in the last 100 years.

This higher temperature may be causing some floating icebergs to melt, but this will not make the oceans rise. Icebergs are large floating chunks of ice. In order to float, the iceberg displaces a volume of water that has a weight equal to that of the iceberg. Submarines use this principle to rise and sink in the water by changing their weight.

But the rising temperature and icebergs could play a small role in the rising ocean level. Icebergs are chunks of frozen glaciers that break off from landmasses and fall into the ocean. The rising temperature may be causing more icebergs to form by weakening the glaciers, causing more cracks and making ice more likely to break off. As soon as the ice falls into the ocean, the ocean rises a little.

If the rising temperature affects glaciers and icebergs, could the polar ice caps be in danger of melting and causing the oceans to rise? This could happen, but no one knows when it might happen.

The main ice covered landmass is Antarctica at the South Pole, with about 90 percent of the world's ice (and 70 percent of its fresh water). Antarctica is covered with ice an average of 2,133 meters (7,000 feet) thick. If all of the Antarctic ice melted, sea levels around the world would rise about 61 meters (200 feet). But the average temperature in Antarctica is -37C, so the ice there is in no danger of melting. In fact in most parts of the continent it never gets above freezing.

At the other end of the world, the North Pole, the ice is not nearly as thick as at the South Pole. The ice floats on the Arctic Ocean. If it melted sea levels would not be affected.

There is a significant amount of ice covering Greenland, which would add another 7 meters (20 feet) to the oceans if it melted. Because Greenland is closer to the equator than Antarctica, the temperatures there are higher, so the ice is more likely to melt.

But there might be a less dramatic reason than polar ice melting for the higher ocean level -- the higher temperature of the water. Water is most dense at 4 degrees Celsius. Above and below this temperature, the density of water decreases (the same weight of water occupies a bigger space). So as the overall temperature of the water increases it naturally expands a little bit making the oceans rise.

In 1995 the International Panel on Climate Change issued a report which contained various projections of the sea level change by the year 2100. They estimate that the sea will rise 50 centimeters (20 inches) with the lowest estimates at 15 centimeters (6 inches) and the highest at 95 centimeters (37 inches). The rise will come from thermal expansion of the ocean and from melting glaciers and ice sheets. Twenty inches is no small amount -- it could have a big effect on coastal cities, especially during storms.

If the polar ice caps melted, how much would the oceans rise?


#3    frogfish

frogfish

    ஆங்கிலத்த&

  • Member
  • 11,142 posts
  • Joined:19 Sep 2005
  • Gender:Male
  • Location:The Swamp

  • Flyfishing -- the Art of the Gods



Posted 13 April 2006 - 10:00 PM

If ice melys, the water spreads around the world, raising sea level, but the difference is too small to recognize.

-Frogfish-
Posted Image
Researcher-Prostate Cancer Oncogene Research
University of Michigan Comprehensive Cancer Center

The National Center for Biotech Information
My Photo Gallery: Capturing India

Fishing is a Way of Life!


#4    StalingradK

StalingradK

    Psychic Spy

  • Member
  • PipPipPipPipPipPipPipPip
  • 1,716 posts
  • Joined:16 Aug 2005
  • Gender:Male
  • Location:Massachusetts

  • We happy few, we band of brothers/
    For he that sheds his blood with me this day/
    Shall be my brother
    -Shakespeare; Henry V

Posted 13 April 2006 - 11:11 PM

Too many people are sucked into the media saying that it will rise like 20 feet or something though sad.gif

Get in the Puma!!!

#5    frogfish

frogfish

    ஆங்கிலத்த&

  • Member
  • 11,142 posts
  • Joined:19 Sep 2005
  • Gender:Male
  • Location:The Swamp

  • Flyfishing -- the Art of the Gods



Posted 14 April 2006 - 01:26 AM

yes.gif

-Frogfish-
Posted Image
Researcher-Prostate Cancer Oncogene Research
University of Michigan Comprehensive Cancer Center

The National Center for Biotech Information
My Photo Gallery: Capturing India

Fishing is a Way of Life!


#6    FrothyDog

FrothyDog

    Ectoplasmic Residue

  • Member
  • Pip
  • 126 posts
  • Joined:08 Oct 2005
  • Location:Texas

  • I'm fully ambimaldextrous... i'm very clumsy with either hand.

Posted 14 April 2006 - 02:56 AM

there's a lot of bad data out there.  some of the best ideas we have, however, are from the fact that during the cretaceous, there was no ice.  during the cretaceous, Texas was also mostly underwater.  so that worries me.  i'll just have to invest in bubble living, because i'm not leaving.

Homo sapiens will survive, no doubt, but it will certainly wreak havoc politically, socially, economically, and ecologically.

Edited by FrothyDog, 14 April 2006 - 03:09 AM.


#7    Mr. 420

Mr. 420

    Apparition

  • Member
  • PipPip
  • 342 posts
  • Joined:21 Jun 2004
  • Location:The Thermo-Stat

  • In a little toolshed he made us suffer, sad satan

Posted 17 April 2006 - 02:22 PM

Quote


huh.gif Im a little puzzled at how the ice caps melting would make our oceans rise. Would it not make sense that the caps work like ice cubes and therefore when they melt our oceans would actually fall to lower levels instead of rise to higher levels blink.gif


yep, ice is full of trapped gases that help weigh it down.  When the ice melts, that gas escapes and the amount of water displaced is lessed, actually lowering the sea level.

most people seem to have a hard time visualizing this.  It helps to fill a glass full of ice, then fill  it the rest of the way with water.  Once the ice melts, the glass will be less full than before.


edit: now ice that is chilling on land, such as greenland, if it melts it will naturaly raise the sea level a little.

Edited by Mr. 420, 17 April 2006 - 02:24 PM.

Posted Image
You wore out your welcome with random precision, rode on the steel breeze...

#8    Master Sage

Master Sage

    Paranormal Investigator

  • Member
  • PipPipPipPipPipPip
  • 753 posts
  • Joined:13 Feb 2006
  • Location:A Galexy far far Away

  • DRAGONZ!!!!

Posted 17 April 2006 - 06:36 PM

Oh common, we can go higher up to save r selfs! mad.gif

Posted ImagePosted ImagePosted ImagePosted Image

#9    frogfish

frogfish

    ஆங்கிலத்த&

  • Member
  • 11,142 posts
  • Joined:19 Sep 2005
  • Gender:Male
  • Location:The Swamp

  • Flyfishing -- the Art of the Gods



Posted 18 April 2006 - 01:48 AM

Quote

yep, ice is full of trapped gases that help weigh it down. When the ice melts, that gas escapes and the amount of water displaced is lessed, actually lowering the sea level.

most people seem to have a hard time visualizing this. It helps to fill a glass full of ice, then fill it the rest of the way with water. Once the ice melts, the glass will be less full than before.


edit: now ice that is chilling on land, such as greenland, if it melts it will naturaly raise the sea level a little.

Actually, you are wrong...If the ice at the caps melts, then the water reached equlibrium by spreading around the world...It raises the water this way.

-Frogfish-
Posted Image
Researcher-Prostate Cancer Oncogene Research
University of Michigan Comprehensive Cancer Center

The National Center for Biotech Information
My Photo Gallery: Capturing India

Fishing is a Way of Life!





1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users