• 4 minutes Will Libya Ever Recover?
  • 9 minutes USGS Announces Largest Continuous Oil Assessment in Texas and New Mexico
  • 13 minutes What Can Bring Oil Down to $20?
  • 16 minutes Venezuela continues to sink in misery
  • 22 hours Alberta govt to construct another WCS processing refinery
  • 9 hours Rage Without Proof: Maduro Accuses U.S. Official Of Plotting Venezuela Invasion
  • 11 mins Paris Is Burning Over Climate Change Taxes -- Is America Next?
  • 13 hours Instead Of A Withdrawal, An Initiative: Iran Hopes To Agree With Russia And Turkey on Syrian Constitution Forum
  • 24 hours Let's Just Block the Sun, Shall We?
  • 15 hours Water. The new oil?
  • 10 hours Storage will in time change the landscape for electricity
  • 2 days U.S. Senate Advances Resolution To End Military Support For Saudis In Yemen
  • 2 mins Anti-pipeline activism isn't generating more investment in renewable energy
  • 2 days Quebecans Snub Noses at Alberta's Oil but Buy More Gasoline
  • 2 days OPEC Cuts Deep to Save Cartel
  • 13 hours Regular Gas dropped to $2.21 per gallon today
North Korean Oil Smugglers Elude U.S. Military

North Korean Oil Smugglers Elude U.S. Military

North Korea continues to skirt…

These Countries Found The Most Oil In 2018

These Countries Found The Most Oil In 2018

Crude oil discoveries picked up…

An Analysis of Climate Change throughout the Ages

It has long been known that characteristics of the Earth’s orbit (its eccentricity, the degree to which it is tilted, and its “wobble”) are slightly altered on timescales of tens to hundreds of thousands of years. Such variations, collectively known as Milankovitch cycles, conspire to pace the timing of glacial-to-interglacial variations.

Despite the immense explanatory power that this hypothesis has provided, some big questions still remain. For one, the relative roles of eccentricity, obliquity, and precession in controlling glacial onsets/terminations are still debated. While the local, seasonal climate forcing by the Milankovitch cycles is large (of the order 30 W/m2), the net forcing provided by Milankovitch is close to zero in the global mean, requiring other radiative terms (like albedo or greenhouse gas anomalies) to force global-mean temperature change.

The last deglaciation occurred as a long process between peak glacial conditions (from ~26-20,000 years ago) to the Holocene (~10,000 years ago). Explaining this evolution is not trivial. Variations in the orbit cause opposite changes in the intensity of solar radiation during the summer between the Northern and Southern hemisphere, yet ice age terminations seem synchronous between hemispheres. This could be explained by the role of the greenhouse gas CO2, which varies in abundance in the atmosphere in sync with the glacial cycles and thus acts as a “globaliser” of glacial cycles, as it is well-mixed throughout the atmosphere. However, if CO2 plays this role it is surprising that climatic proxies indicate that Antarctica seems to have warmed prior to the Northern Hemisphere, yet glacial cycles follow in phase with Northern insolation (“INcoming SOLar radiATION”) patterns, raising questions as to what communication mechanism links the hemispheres.

Click here for the full article



Join the discussion | Back to homepage

Leave a comment
  • Mel Tisdale on May 15 2012 said:
    Very useful article, mind you, considering its origin, it could hardly be otherwise.

Leave a comment

Oilprice - The No. 1 Source for Oil & Energy News