Which Provides a Better Record of Earths Surface Air Temperature History?
The Portugal Story Reference Correia, A. and Safanda, J. 1999. Preliminary ground surface temperature history in mainland Portugal reconstructed from borehole temperature logs. Tectonophysics 306: 269-275. What was done The authors reviewed a set of twenty temperature logs derived from boreholes located at fourteen different sites in mainland Portugal in an attempt to reconstruct a five-century surface air temperature history for that part of the world. What was learned Seven of the borehole temperature logs were too “noisy” to use; while six displayed evidence of groundwater perturbations and were thus not usable for that reason. Of the remaining seven logs, all depicted little temperature change over the first three centuries of record. Thereafter, four of them exhibited warming trends that began about 1800 and peaked around 1940, one showed a warming that peaked in the mid-1800s, another was constant across the entire five centuries, and one actually revealed cooling over the last c
