Gotta love a long unbroken proxy.
Scientists looked at 44 pines sites across the Scottish Highlands and used their tree rings to create a continuous temperature series for the last 810 years. Showing admirable restraint, they did not paste on adjusted thermometer records to create a hockey stick effect. Instead we can see that Scottish summers were just as warm in the 1300s, the 1280s and around 1500 as well.
The rate of warming is not unprecedented. The temperature is not unusual. But thermometers don’t tell the same story as the tree rings in the last 50 years. They both can’t be right. Either the tree rings are always unreliable thermometers or the thermometers are placed near ice cream trucks and adjusted up-the-kazoo?
Rydval et al. extended “the previously published Scottish dendroclimatic record (Hughes et al., 1984) by nearly 500 years,” in order to create an 810-year-long proxy over the period AD 1200-2010. The reconstruction was derived from a network of 44 Scots pine (Pinus Sylvestris) sites across the Scottish Highlands from both living and subfossil samples that correlated well with summer (July-August) temperatures.
In placing the most recent warming of the instrumental period in context, Rydval et al. write that it “is likely not unique when compared to multi-decadal warm periods observed in the 1300s, 1500s and 1730s.”
Looking at Scottish summer temperatures what we see is 800 years of ignorance
Rydval, M., Loader, N.J., Gunnarson, B.E., Druckenbrod, D.L., Linderholm, H.W., Moreton, S.G., Wood, C.V. and Wilson, R. 2017. Reconstructing 800 years of summer temperatures in Scotland from tree rings. Climate Dynamics 49: 2951-2974.