Abrantes, F., Rodrigues, T., Montanari, B., Santos, C., Witt, L., Lopes, C. and Voelker, A.H.L. 2011. Climate of the last millennium at the southern pole of the North Atlantic Oscillation: an inner-shelf sediment record of flooding and upwelling. Climate Research 48: 261-280.
Abrantes et al. (2011) reconstructed a sea surface temperature (SST) history for waters off the coast of Porto, Portugal (at ~41.1°N, 8.9°W), covering the past thousand years, based on the alkenone index UK'37 that they derived from a sediment core extracted from a water depth of 80 meters in May 2002, which they calibrated against measured SSTs over the period 1945-2006. This work revealed the occurrence of the Little Ice Age, as well as what they describe as the "persistently higher temperatures registered in the AD 960-1300 interval that we identify as the MWP." And from a graph of their SST history, one can see that the peak warmth of the MWP was about 1.2°C greater than the peak warmth of the CWP during the late 20th century.