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GISP2 Ice Core, Central Greenland
Kobashi, T., Severinghaus, J.P., Barnola, J.-M., Kawamura, K., Carter, T. and Nakaegawa, T. 2010. Persistent multi-decadal Greenland temperature fluctuation through the last millennium. Climatic Change 100: 733-756.

Kobashi et al. (2010) constructed a history of the last thousand years of central Greenland surface air temperature, based on values of isotopic ratios of nitrogen and argon previously derived by Kobashi et al. (2008) from air bubbles trapped in the GISP2 ice core that had been extracted from central Greenland (72°36'N, 38°30'W). The results, shown in the figure below, reveal that the latter part of the Medieval Warm Period was approximately 1.67°C greater than the temperature of the last decades of the 20th century, which climate alarmists claim to have been the warmest of the past millennium.

Central Greenland surface temperature reconstruction for the last millennium. Adapted from Kobashi et al. (2010).

Additional Reference
Kobashi, T., Severinghaus, J.P. and Kawamura, K. 2008. Argon and nitrogen isotopes of trapped air in the GISP2 ice core during the Holocene epoch (0-11,600 B.P.): methodology and implications for gas loss processes. Geochimica et Cosmochimica Acta 72: 4675-4686.