A new peer reviewed paper published in Quaternary Science Reviews 41 (Link) is yet another nail in the MBH98 HockeyStick's coffin. The authors Larocque-Tobler et al found that the Medieval Warm Period - or as they refer to it - the 'Medieval Climate Anomaly' (MCA) was warmer than the temperatures in the last century.
Larocque-Tobler, I., Stewart, M.M., Quinlan, R., Traschel, M., Kamenik, C. and Grosjean, M. 2012. A last millennium temperature reconstruction using chironomids preserved in sediments of anoxic Seebergsee (Switzerland): consensus at local, regional and Central European scales. Quaternary Science Reviews 41: 49-56.
The six scientists' work revealed that the peak warmth of the MCA just prior to AD 1200 was approximately 0.9°C greater than the peak warmth near the end of their record, as best we can determine from the graph of their data.
What it means
As more and more palaeo-temperature data are acquired, the IPCC-endorsed "hockeystick" temperature record of Mann et al. (1999) - which gives little indication of the existence of the MCA and shows recent temperatures towering over those of that earlier time period - is fading slowly into the night, as it is repudiated by ever more real-world data. And it's not just the most recent data of Larocque-Tobler et al. that refute the IPCC's view of this matter; for the group of six says that their newest temperature history is "mirrored by the chironomid reconstruction from Silvaplana and the Greater Alpine Region composite of reconstructions." And they add that "several other reconstructions from the Northern Hemisphere also show [recent] warm inferred temperatures that were not as warm as the MCA."
CO2 Science adds:
In addition, and it's a big addition, we note that many more palaeoclimatic studies from all around the world - which are described and have their results tabulated in our Medieval Warm Period Project - likewise testify to the greater-than-current peak-warmth of the MCA.