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The Holocene temperature record poses some problems for proponents of the AGW concept. They haven't really dealt with them well.
A Warm Period by Any Other Name – The Climatic Optimum
Hypsithermal, Altithermal, Holocene Optimum, Holocene Thermal Maximum, Holocene Megathermal, Anthropogene; Guest opinion: Dr. Tim Ball There is frustration and reward when an article appears on the same topic of an article you are completing – in this case the Holocene. Such was the case this week with Andy May’s article “A Review of temperature reconstructions.”…
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". . . Even a cursory examination of the Holocene shows why the period is problematic for promoters of anthropogenic global warming (AGW). As Steve McIntyre pointed out, the problems began when skeptics noted that the temperature for most of the Holocene contradicted their claim that the latter part of the 20th century was the warmest ever. I know they never used the term ‘ever’, rather, it was left unsaid but implied in the message to the public and not contradicted when used by the media.
McIntyre wrote;
The temperature evolution over the Holocene has been established for many different regions, often with centennial-resolution proxy records more sensitive to specific seasons.
Of course, this was before Climategate and the leaked emails that destroyed the Team’s credibility. . . ."
A Warm Period by Any Other Name – The Climatic Optimum
Hypsithermal, Altithermal, Holocene Optimum, Holocene Thermal Maximum, Holocene Megathermal, Anthropogene; Guest opinion: Dr. Tim Ball There is frustration and reward when an article appears on the same topic of an article you are completing – in this case the Holocene. Such was the case this week with Andy May’s article “A Review of temperature reconstructions.”…
Continue reading →
". . . Even a cursory examination of the Holocene shows why the period is problematic for promoters of anthropogenic global warming (AGW). As Steve McIntyre pointed out, the problems began when skeptics noted that the temperature for most of the Holocene contradicted their claim that the latter part of the 20th century was the warmest ever. I know they never used the term ‘ever’, rather, it was left unsaid but implied in the message to the public and not contradicted when used by the media.
McIntyre wrote;
The Team has taken a preditable (sic) position on the Holocene Optimum: that it’s a regional and restricted event.
It was predictable because it was the same argument they used for the Medieval Warm Period (MWP). Prove an event was regional, and you essentially eliminate the Sun as a mechanism of change – an issue central to the AGW CO2 argument. The restriction included the claim that only summer temperatures were warmer. Even if true, it is not possible to say based on proxy records with 40 to 70-year smoothing averages applied. Interestingly, the IPCC clung to this “Team” view as recently as AR4 (2007).
The temperature evolution over the Holocene has been established for many different regions, often with centennial-resolution proxy records more sensitive to specific seasons.
Of course, this was before Climategate and the leaked emails that destroyed the Team’s credibility. . . ."