Drilling deep into Antarctic ice, scientists have extended Earth's climate history by another 210,000 years. The new results, they say, drive home two key points: (1) Today's atmosphere holds concentrations of carbon dioxide significantly higher than at any time in the last 650,000 years; (2) The rise and fall in temperatures track the rise and fall in carbon-dioxide levels as tightly during this additional period as they have over the past 440,000 years.CLIMATE CHANGES ARE REGULAR AND GO BACK AT LEAST 650,000 YEARS, AND ARE LINKED TO CHANGES IN THE EARTH'S ORBIT. And, er... um I don't want to rub it in but, there were NO SUVS around 650,000 years ago. SO... all you Left-wing enviro-nuts who think global warming is man-made and that will cause a HORRIFIC and AVOIDABLE enviromental catstrophe if we don't do something drastic - NOW! - should shut the ef up because this study proves once again that MAN-MADE GLOBAL WARMING IS ALL BUNK!
The results add "another piece of information showing that the time scales on which humans have changed the composition of the atmosphere are extremely short compared to the natural time cycles of the climate system," notes Thomas Stocker, a researcher at the University of Bern in Switzerland and a member of the research team reporting the results. The most telling result, he adds, is the relationship between long-term CO2 trends and long-term temperature trends. Dr. Brook, with Oregon State University in Corvallis, explains that in these latest results, the warm periods between glacial deep freezes are cooler than those over the past 440,000 years. Yet the virtual lockstep pattern as temperatures and CO2 levels rise and fall, seen in previous ice cores, holds even for these more-modest swings in global climate.
"It's really striking. The link between temperatures and greenhouse gases is tight," he says. ... in addition to carbon dioxide, the cores also contain information on methane, a powerful greenhouse gas, and nitrous oxide. In a separate study from the same cores, the rise and fall of methane also tracked closely with that of CO2 and temperatures. Both sets of results appear in Friday's edition of the journal Science. The triggers for the changes in gas concentrations remain a mystery, Brook acknowledges. They tend to lag the temperature record by some 800 to 1,000 years.
Some have argued that this gap rules out a connection between rising CO2 and the warming climate. But Brook explains that the gap most likely signals a "positive feedback" in the climate system. In short, warmth begets more CO2 in the atmosphere. This raises temperatures further, which leads to more CO2 released into the air. The shift between these glacial periods and warm "interglacial" periods has been linked to long-term changes in Earth's tilt as it orbits the sun.
Monday, November 28, 2005
ICE CORES PROVE: CLIMATE CHANGE HAS HAD A REGULAR PATTERN FOR THE LAST 650,000YEARS
GLOBAL WARMING AND GLOBAL COOLING HAVE BEEN REGULAR FEATURES OF EARTH'S CHANGING CLIMATE FOR 650,000 YEARS! CSM: "Old ice gives new clues to climate change" --
Posted by Reliapundit at 12:24 AM