When was the last time CO2 levels were as high as today?

Discussion in 'Environment' started by Old Rocks, Nov 21, 2009.

  1. Old Rocks
    Offline

    Old Rocks Diamond Member

    Joined:
    Oct 31, 2008
    Messages:
    46,469
    Thanks Received:
    5,415
    Trophy Points:
    1,840
    Location:
    Portland, Ore.
    Ratings:
    +10,311
    As techniques improve, we are finding more ways to study the past climate history of our planet in detail. The following site has far more information than just what is in the post.

    Science: CO2 levels haven’t been this high for 15 million years, when it was 5° to 10°F warmer and seas were 75 to 120 feet higher — “We have shown that this dramatic rise in sea level is associated with an increase in CO2 levels


    Tripati, before joining UCLA’s faculty, was part of a research team at England’s University of Cambridge that developed a new technique to assess carbon dioxide levels in the much more distant past — by studying the ratio of the chemical element boron to calcium in the shells of ancient single-celled marine algae. Tripati has now used this method to determine the amount of carbon dioxide in Earth’s atmosphere as far back as 20 million years ago.

    “We are able, for the first time, to accurately reproduce the ice-core record for the last 800,000 years — the record of atmospheric C02 based on measurements of carbon dioxide in gas bubbles in ice,” Tripati said. “This suggests that the technique we are using is valid.

    “We then applied this technique to study the history of carbon dioxide from 800,000 years ago to 20 million years ago,” she said. “We report evidence for a very close coupling between carbon dioxide levels and climate. When there is evidence for the growth of a large ice sheet on Antarctica or on Greenland or the growth of sea ice in the Arctic Ocean, we see evidence for a dramatic change in carbon dioxide levels over the last 20 million years.

    “A slightly shocking finding,” Tripati said, “is that the only time in the last 20 million years that we find evidence for carbon dioxide levels similar to the modern level of 387 parts per million was 15 to 20 million years ago, when the planet was dramatically different.”

    Levels of carbon dioxide have varied only between 180 and 300 parts per million over the last 800,000 years — until recent decades, said Tripati, who is also a member of UCLA’s Institute of Geophysics and Planetary Physics. It has been known that modern-day levels of carbon dioxide are unprecedented over the last 800,000 years, but the finding that modern levels have not been reached in the last 15 million years is new.
     
  2. Si modo
    Offline

    Si modo Diamond Member

    Joined:
    Sep 9, 2009
    Messages:
    41,538
    Thanks Received:
    6,382
    Trophy Points:
    1,810
    Location:
    St. Eligius
    Ratings:
    +8,703
    :thup: Keep it up, Rocks. My chances of making a killing in ocean-side property keep getting better and better.
     
    • Thank You! Thank You! x 1
    Last edited: Nov 21, 2009
  3. CrusaderFrank
    Offline

    CrusaderFrank Diamond Member

    Joined:
    May 20, 2009
    Messages:
    81,175
    Thanks Received:
    14,905
    Trophy Points:
    2,210
    Ratings:
    +36,917
    What created Long Island Sound? When?
     
  4. AllieBaba
    Offline

    AllieBaba BANNED

    Joined:
    Oct 2, 2007
    Messages:
    33,778
    Thanks Received:
    3,648
    Trophy Points:
    0
    Ratings:
    +3,650
    So we all agree that high levels of CO2 won't kill off the planet, and is produced primarily by vegetation.
     
    • Thank You! Thank You! x 1
  5. Old Rocks
    Offline

    Old Rocks Diamond Member

    Joined:
    Oct 31, 2008
    Messages:
    46,469
    Thanks Received:
    5,415
    Trophy Points:
    1,840
    Location:
    Portland, Ore.
    Ratings:
    +10,311
    You are incapable of useing Google?
     
  6. Old Rocks
    Offline

    Old Rocks Diamond Member

    Joined:
    Oct 31, 2008
    Messages:
    46,469
    Thanks Received:
    5,415
    Trophy Points:
    1,840
    Location:
    Portland, Ore.
    Ratings:
    +10,311
    CO2 is produced by vegitation? Better take a basic biology class, old girl.
     
    • Thank You! Thank You! x 1
  7. CrusaderFrank
    Offline

    CrusaderFrank Diamond Member

    Joined:
    May 20, 2009
    Messages:
    81,175
    Thanks Received:
    14,905
    Trophy Points:
    2,210
    Ratings:
    +36,917
    "Glacial history

    About 18,000 years ago, Connecticut, Long Island Sound, and much of Long Island were covered by a thick sheet of ice, part of the Late Wisconsin Glacier. About 3,300 feet (1,000 m) thick in its interior and about 1,300 to 1,600 feet (400 to 500 m) thick along its southern edge, it was the most recent of a series of glaciations that covered the area during the past 10 million years. Sea level at that time was about 330 feet (100 m) lower than today.[1]"

    Long Island Sound - Wikipedia, the free encyclopedia

    Why did the glaciers retreat 18,000 years ago, Sparky?
     
  8. Old Rocks
    Offline

    Old Rocks Diamond Member

    Joined:
    Oct 31, 2008
    Messages:
    46,469
    Thanks Received:
    5,415
    Trophy Points:
    1,840
    Location:
    Portland, Ore.
    Ratings:
    +10,311
    Milankovic Cycles.
     
  9. Zander
    Offline

    Zander Platinum Member

    Joined:
    Sep 10, 2009
    Messages:
    17,452
    Thanks Received:
    6,575
    Trophy Points:
    390
    Location:
    Los Angeles CA
    Ratings:
    +12,888
    Co2 is at an ll time high, yet the planet is cooling. Yep, makes perfect sense, to morons.

    You globull warming bed wetters are really silly!
     
  10. Chris
    Offline

    Chris Gold Member

    Joined:
    May 30, 2008
    Messages:
    23,154
    Thanks Received:
    1,958
    Trophy Points:
    205
    Location:
    Virginia
    Ratings:
    +2,089
    No you are silly.

    The arctic ice is melting even though the Sun is at its lowest level of activity in 80 years.

    Why?
     

Share This Page