Guest Post By: Renee Hannon IntroductionThis post examines whether CO2 measurements in Greenland ice cores demonstrate natural variability as an alternative hypothesis to in-situ chemical reactions. Twenty years ago, scientists theorized Greenland ice core CO2 data were unreliable because CO2 trapped in air bubbles had potentially been altered by in-situ chemical reactions. This theory wasContinue reading “Greenland Ice CO2 – Chemical Reactions or Natural Variability?”
Guest post by Renee Hannon IntroductionThis post examines regional temperature reconstructions during the past several thousand years relative to different baselines and the responses of end member deviants, the Arctic and Antarctic polar extremes. And it’s a quite interesting tug of war.
Guest post by Renee Hannon IntroductionIce cores datasets are important tools when reconstructing Earth’s paleoclimate. Antarctic ice core data are routinely used as proxies for past CO2 concentrations. This is because twenty years ago scientists theorized Greenland ice core CO2 data was unreliable since CO2 trapped in air bubbles had potentially been altered by in-situContinue reading “Greenland Ice Core CO2 Concentrations Deserve Reconsideration”
Review of temperature reconstructions for the past 4000 years
By Andy May In 2000, Richard Alley released an ice core temperature reconstruction for Central Greenland using Oxygen isotope ratios. He describes the technique used here. I used this ice core proxy data in a previous post “Climate and Civilization for the past 4,000 years.” Since Alley’s data stops at 1855, I spliced the GreenlandContinue reading “Comparing the Kobashi and Alley Central Greenland Temperature Reconstructions”