Another inconvenient Truth.
3 to 4 degrees centigrade warmer, in fact. Far greater than recent warming.
The new paper, Kulman et al. 2018 relies on paleoclimatology, which as we’ve learned from Mann, can be taken with a grain of salt.
Because trees may only grow within narrowly-defined temperature ranges and elevations above sea level, perhaps the most reliable means of assessing the air temperatures of past climates is to collect ancient treeline evidence.
In a new paper, Kullman (2018) found tree remnants at mountain sites 600 to 700 meters north of where the modern treeline ends, strongly implying Early Holocene air temperatures in northern Sweden were 3-4°C warmer than recent decades.
“The present paper reports results from an extensive project aiming at the improved understanding of postglacial subalpine/alpine vegetation, treeline, glacier and climate history in the Scandes of northern Sweden. The main methodology is analyses of megafossil tree remnants, i.e. trunks, roots, and cones, recently exposed at the fringe of receding glaciers and snow/ice patches. This approach has a spatial resolution and accuracy, which exceeds any other option for tree cover reconstruction in high-altitude mountain landscapes.”
“All recovered tree specimens originate from exceptionally high elevations, about 600-700 m atop of modern treeline positions.”
“Conservatively drawing on the latter figure and a summer temperature lapse rate of 0.6 °C per 100 m elevation (Laaksonen 1976), could a priori mean that summer temperatures were at least 4.2 °C warmer than present around 9,500 years before present. However, glacio-isostatic land uplift by at least 100 m since that time (Möller 1987; Påsse & Anderson 2005) implies that this figure has to be reduced to 3.6 °C higher than present-day levels, i.e. first decades of the 21st century. Evidently, this was the warmth peak of the Holocene, hitherto.”
“This inference concurs with paleoclimatic reconstructions from Europe and Greenland (Korhola et al. 2002; Bigler et al. 2003; Paus 2013; Luoto et al. 2014; Väliranta et al. 2015).”
This study adds seven new dates of mega fossil tree remnants (4 Betula, 2 Pinus, 1 Picea) to a
previous sample of 21 specimens from the same glacier (12 Betula, 9 Pinus) (Kullman &Öberg
2015). Individual dates are given in Table 1 and the samples are depicted in Figures 5-7. They range
in elevation between 1410 and 1275 m a.s.l., which is about 600 and 700 m higher than the nearest
present-day treelines of these species. The ages all represent the early Holocene, c. 11 200 to 6700
There’s also this new paper:
Greenland Ice Sheet 2-5°C Warmer With Much Lower Volume During The Early Holocene