{"id":330842,"date":"2024-06-01T17:15:25","date_gmt":"2024-06-01T15:15:25","guid":{"rendered":"https:\/\/climatescience.press\/?p=330842"},"modified":"2024-06-01T17:15:27","modified_gmt":"2024-06-01T15:15:27","slug":"megafossil-carbon-dating-indicates-sweden-was-2-3c-warmer-than-today-during-the-last-glacial","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=330842","title":{"rendered":"Megafossil Carbon Dating Indicates Sweden Was 2-3\u00b0C Warmer Than Today During The Last Glacial"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

From NoTricksZone<\/a><\/p>\n\n\n\n

By\u00a0Kenneth Richard<\/a>\u00a0<\/em><\/p>\n\n\n\n

\u201cModern warming is within natural Holocene climate variability\u201d \u2013\u00a0Kullman and \u00d6berg, 2024<\/a><\/strong><\/p>\n\n\n\n

From about 16,800 to 6000 years ago warmth-dependent tree species grew 300-700 altitudinal meters higher than they do today on Mt. \u00c5reskutanthan, Swedish Scandes.<\/p>\n\n\n\n

Due to the well-known warmth threshold for boreal tree species and the lapse rate (0.6\u00b0C per 100 m), recovering birch, spruce, and pine megafossil remains at much higher elevations than today\u2019s treeline altitudes affirms much warmer-than-today climates during the late last glacial and through the early Holocene, when CO2 ranged from 190 to 255 ppm.<\/p>\n\n\n\n

\u201cIt is increasingly evident that common boreal tree species grew close to this summit in a climate, 2-3\u00b0C warmer than at present, during the Lateglacial and early Holocene periods 16 800- 6000 years ago.\u201d<\/em><\/p>\n\n\n\n

The scientists point out that such early dating for warmer-than-today climates has been viewed as controversial, as it is assumed the Earth had not sufficiently warmed or deglaciated until about 11,000 years ago, near the official starting timeline for the Holocene. But the carbon-dating of tree megafossils is regarded as a much more reliable data collection method than pollen analysis and terrestrial cosmogenic nuclide analysis, so these results are robust.<\/p>\n\n\n\n

\u201cMoreover, Mt. \u00c5reskutan has been in the centre of a controversy concerning the date of deglaciation and late-glacial arboreal performance. Kullman (2000, 2002) presented robust megafossil data, showing unequivocal presence of mountain birch (Betula pubescens ssp. czerepanovii), spruce (Picea abies) and pine (Pinus sylvestris), as early as about 16 000 cal. a BP, close to the summit 300-400 m higher than present-day treelines.\u201d<\/em><\/p>\n\n\n\n

While there has been warming in this region recently, the warming is \u201cwithin natural Holocene climate variability\u201d and poses no threat to these landscapes. Instead, warming may enhance biodiversity in this region.<\/p>\n\n\n\n

The Intergovernmental Panel on Climate Change (IPCC) promulgates a contrasting \u201calarmist and dystopic\u201d viewpoint of warming as a \u201cserious and imminent threat to man and planet Earth\u201d as they simultaneously \u201cdowngrade natural climate history and rely more on immature and unvalidated numerical models.\u201d<\/p>\n\n\n\n

\"\"
Image Source:\u00a0Kullman and \u00d6berg, 2024<\/a><\/strong><\/figcaption><\/figure>\n\n\n\n

For good measure, another new Scandinavian study (Salonen et al., 2024<\/a><\/strong>) indicates today\u2019s temperatures in northern Finland are among the coldest of the last 8000 years (see \u201cPresent-day value\u201d dashed line). Much of the Holocene \u2013 as well nearly all of the last interglacial (LIG) \u2013 was 2 to 2.5\u00b0C warmer than present.<\/p>\n\n\n\n

\"\"
Image Source:\u00a0Salonen et al., 2024<\/a><\/strong><\/figcaption><\/figure>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

\u201cIt is increasingly evident that common boreal tree species grew close to this summit in a climate, 2-3\u00b0C warmer than at present, during the Lateglacial and early Holocene periods 16 800- 6000 years ago.\u201d<\/p>\n","protected":false},"author":121246920,"featured_media":330848,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691828917,691818076,691828918,691818876,691828919],"class_list":["post-330842","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-carbon-dating","tag-co2","tag-mt-areskutanthan","tag-sweden","tag-warmer-than-today","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/06\/0sweden-areskutan-mountains-lbowy37e6sr8c4vx.jpg?fit=1920%2C1280&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1o4a","jetpack-related-posts":[{"id":438384,"url":"https:\/\/climatescience.press\/?p=438384","url_meta":{"origin":330842,"position":0},"title":"An Inconvenient Tree: 6,000-Year-Old Giant Pine Proves Europe Was Warmer Than Today","author":"uwe.roland.gross","date":"04\/09\/2026","format":false,"excerpt":"A massive 1.7-ton log from a mature Swiss stone pine (Pinus cembra, locally \"Zirbe\") was unearthed in the glacier's retreat zone at ~2,060 meters elevation. 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