Claims the Swedish Scandes are unprecedentedly warm and tree-covered today “appear as large and unfounded exaggerations,” as the “climate and arboreal responses” of the last few decades “are still inside the frames of natural historical variation.” – Kullman, 2022 and Kullman, 2022a
Extensive birch forest fossils can be dated to the early- to mid-Holocene in northern Scandinavian regions, indicating these warmth-sensitive trees could exist in climates that are too cold for them to grow in today. This documents a much warmer period, “at least 3°C higher than during the past few decades,” 3000 to 10,000 years ago, or when CO2 was about 265 ppm (Kullman, 2022).
Contrary to modeler opinions, “there is little factual nourishment” to support modern projections that the Swedish Scandes will soon be returning to the subalpine birch forest climates of past millennia. The observed forest advancement in recent decades “is so small” that these modeling claims appear to be “unfounded exaggerations.”
“In the southernmost Swedish Scandes, pine has already “leap-frogged” over receding the birch forest-limit (Kullman 2014, 2019). That scenario would mimic the arboreal landscape during the early Holocene and shift to a landscape unseen for thousands of years (cf. Blűthgen 1942; MacDonald et al. 2008, Macias-Fauria et al. 2012). During that epoch, summer temperatures are inferred to have been at least 3°C higher than during the past few decades.”
“At the landscape level, the obtained changes contribute to a greater and lusher landscape, in contrast to the dire conditions during the Little Ice Age, more than 100 years ago (Kullman 2010, 2015). Currently, there is little factual nourishment to flourishing projections stating that a major part of Swedish alpine areas is on verge of transformation to subalpine birch forest (e.g. Moen et al. 2004). Apparently, climate and arboreal responses are still inside the frames of natural historical variation, as inferred by several authors (e,g. Hammarlund et al. 2004; Bergman et al. 2005; Kullman 2013, 2017a, b; Kullman & Öberg 2018, 2020).”
“Given that the current relatively warm climate phase continues, the subalpine birch forest belt may eventually recede and give way to a subalpine pine belt. The obtained modest forest-limit advancement is so small that flourishing model simulations of extensive birch forest expansion over most of the current alpine tundra appear as large and unfounded exaggerations.”
Tree remnants (trunks, cones, roots, etc.) found at northern Sweden mountain sites 500 to 700 meters atop where the 21st century tree line ends imply the early-Holocene (~13,000 to 7000 years ago) climate was significantly warmer than today in this region (Kullman, 2022a).
The temperature lapse rate for the Swedish Lapland region is 0.6°C/100 m. Accounting for glacio-isostatic uplift, this tree line elevation implies surface air temperatures were 3.6°C higher than today during the Early Holocene.
“A megafossil wood remnant of Norway spruce (Picea abies (L.) Karst.) was retrieved from a high-elevation nunatak in the southern Swedish Scandes. The site was nearly 600 m higher than the present-day treeline.”
“The early Holocene presence of spruce is firmly documented by megafossils at multiple sites in the subalpine/alpine and upper boreal landscapes along the entire Swedish Scandes. In some cases, the finding sites were located 500-700 m above modern treelines and ranging between 13 000 and 7000 years before the present (14, 23). Occasionally, macro and megafossils tree remains have been released from the rim of melting glaciers and ice patches high above modern treelines, indicating glacier-free mountains and relatively warm conditions during the late-glacial and early Holocene epochs (21, 21, 22).”
Image Source: Kullman, 2022a
Northern Europe’s alpine temperatures are presently “well within the frames of natural variability,” as the “forest border is virtually unchanged in position since the early 20th century” (Kullman and Öberg, 2022). Even the Medieval Warm Period had treelines positioned 100 m or more above the present altitudes, indicating the Viking period was warmer than today.
All this evidence supports the conclusion that “alarmist model predictions of a pending major transformation of alpine tundra in the Swedish Scandes to subalpine forest are little supported by the current and other real-world observations.”
2 responses to “3 Paleontologist Studies Affirm North Sweden Was 3°C Warmer Than Today When CO2 Was Below 280 ppm”
A Sabine Hossenfelder YouTube video aimed at explaining the physics of the greenhouse effect, in fact hilariously refutes CO2 warming by contradicting itself! Sabine starts – correctly – by pointing out the simplistic model most people believe is plain wrong. CO2 does not trap some IR that otherwise would have made it out to space. Because none of it makes it more than about 20 meters. That’s CO2 warming argument #1 refuted.
So then we retreat to a second defensive line of CO2 warming argument #2: the emission height story. Maybe you’ve heard it. I had – but I was amazed I hadn’t realised its fatal flaw that Sabine pointed out at exactly 10 minutes into the video. The emission height CO2 warming mechanism depends on the atmosphere getting colder with height. But that only happens up to the stratosphere at about 12 km. Above that, the temperature trend reverses and the atmosphere gets warmer with increasing height! So now, more CO2 would do the opposite and cool the planet. (I’m amazed I hadn’t seen this huge hole in the emission height argument.) “Preindustrial” CO2 levels already had the emission height at the base of the stratosphere – so further elevating it pushes it to levels with higher, not lower, temperature resulting conversely in cooling, not warming. So the whole emission height argument #2 is just as stillborn as the absurdly simply saturation-ignoring trapped-IR argument #1.
Thus finally as in the German army’s defences at the Somme in France in 1916 during WW1 there is retreat to defensive line #3. Now it gets very hairy and tortuously complex and we start talking about the spectral trough of CO2 IR absorption and subtle effects that widen this trough. The whole narrative now hides behind trenches of arcane complexity. However the hilarious thing is that at this point, at 13 minutes and 13 seconds, Sabine explains that the CO2 spectral trough widening argument – defensive line #3 – also depends on the atmosphere getting colder with height! This is extraordinary self-contradiction because in argument #2 we were already shown – at 10 minutes – that the atmosphere only cools with height up to the stratosphere, after which it warms with further ascent.
So argument #3 depends on air cooling with height which argument #2 already shows is false in the stratosphere. So Sabine’s whole video is a spectacular own-goal for the CO2 warming argument.
In the closing minutes Sabine silently recognises these problems and tries to rescue a CO2 warming scenario by bringing in layer after layer of new complexity: it’s not just CO2 but also water and methane plus every wavelength has its own emission height, etc. But one thing is clear. The simplistic CO2 “heat trapping” argument that most warmists swear by is, as Linus Pauli would have said, “not even wrong”, but impossible. And the huge complexity of the real IR dynamics mean that unexpected answers again become possible. Such as that CO2 causes no warming whatsoever.
Thanks Sabine – a very helpful video on the CO2 story!
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