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Northern Icelandic Coast
Reference
Sicre, M.-A., Jacob, J., Ezat, U., Rousse, S., Kissel, C., Yiou, P., Eiriksson, J., Knudsen, K.L., Jansen, E. and Turon, J.-L. 2008. Decadal variability of sea surface temperatures off North Iceland over the last 2000 years. Earth and Planetary Science Letters 268: 137-142.

Description
The authors developed a unique 2000-year-long summer sea surface temperature (SST) record with unprecedented temporal resolution (2-5 years) from a sediment core retrieved off North Iceland (6633'N, 1742'W), based on their analyses of alkenones synthesized primarily in the summer by the marine alga Emiliania huxleyi that grew in the overlying ocean's surface waters, while dating of the SST data was provided by tephrochronology. The results, pictured below, indicate that the peak warmth of the Medieval Warm Period was about 1C higher than the peak warmth of the Current Warm Period.