CO2 Sample Spacing in Ice Cores

Guest Post by Renee Hannon Introduction This post examines sample spacing for CO2 measurements in Antarctic ice cores during the past 800,000 years to better understand if gaps in sampling are too large to capture centennial fluctuations. The IPCC states: “Although ice core records present low-pass filtered time series due to gas diffusion and gradualContinue reading “CO2 Sample Spacing in Ice Cores”

Autocorrelation in CO2 and Temperature Time Series

By Andy May In my last post I plotted the NASA CO2 and the HadCRUT5 records from 1850 to 2020 and compared them. This was in response to a plot posted on twitter by Robert Rohde implying they correlated well. The two records appear to correlate because the resulting R2 is 0.87. The least square’sContinue reading “Autocorrelation in CO2 and Temperature Time Series”

CO2 and Temperature

By Andy May I had a very interesting online discussion about CO2 and temperature with Tinus Pulles, a retired Dutch environmental scientist. To read the whole discussion, go to the comments at the end of this post. He presented me with a graphic from Dr. Robert Rohde from twitter that you can find here. ItContinue reading “CO2 and Temperature”

Holocene CO2 Variability and Underlying Trends

Guest Post by Renee Hannon Introduction This post compares CO2 data from Antarctic ice cores during the Holocene interglacial period with other publicly available CO2 datasets. Antarctic ice CO2 is regarded as the gold standard for paleo-atmospheric global CO2 during past interglacial and glacial periods. Antarctic CO2 does capture the multi-millennial underlying trend; however, short-termContinue reading “Holocene CO2 Variability and Underlying Trends”

Holocene Antarctic CO2 Variability or Lack Of

Guest Post by Renee Hannon Introduction This post examines CO2 ice core measurements from Antarctica during the Holocene Epoch. The key CO2 dataset for paleoclimate studies is the EPICA Dome C (EDC) data also known as Dome Charlie or Dome Concordia. Dome C is located on the eastern Antarctic Plateau, one of the coldest placesContinue reading “Holocene Antarctic CO2 Variability or Lack Of”

Greenland Ice Core CO2 during the past 1,000 years

Guest Post by Renee Hannon Introduction This post compares CO2 ice core measurements from Greenland to those from Antarctica over the last millennium. Paleoclimate studies typically use only Antarctic ice cores to evaluate past CO2 fluctuations. This is because the entire Greenland CO2 datasets were deemed unreliable due to chemical reactions with impurities in theContinue reading “Greenland Ice Core CO2 during the past 1,000 years”

The CO2 Shift; Ice Age to Gas Age

Guest Post by Renee Hannon IntroductionThis post examines CO2 data collected from Antarctic ice cores and compares CO2 measurements in both ice age and gas age. The age of trapped gas in ice varies dramatically across the Antarctic and is dependent on accumulation rates. To compensate for this age difference, peer reviewed studies use aContinue reading “The CO2 Shift; Ice Age to Gas Age”

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