{"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":"","_crdt_document":"","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_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":{"0":"post-330842","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-carbon-dating","9":"tag-co2","10":"tag-mt-areskutanthan","11":"tag-sweden","12":"tag-warmer-than-today","14":"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":363287,"url":"https:\/\/climatescience.press\/?p=363287","url_meta":{"origin":330842,"position":0},"title":"Central Japan Was 3\u00b0C (And Up To 7\u00b0C) Warmer Than Today Throughout the Early to Mid-Holocene","author":"uwe.roland.gross","date":"25\/01\/2025","format":false,"excerpt":"\u201cBased on the records of the\u00a0\u03b4\u00b9\u2078O\u00a0stalagmite, the [Holocene Thermal Maximum] occurred between 10.9 and 6.7 ka [Honshu, Japan], reaching its peak temperature (15.0\u00b0C) around 7.0 ka. At this time, temperatures were approximately 3\u00b0C warmer than present.\u201d \u2013 Murata et al., 2025","rel":"","context":"In \"central Japan\"","block_context":{"text":"central Japan","link":"https:\/\/climatescience.press\/?tag=central-japan"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0GettyImages-556421003-57a517d55f9b58974a959f14.jpg?fit=1200%2C748&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0GettyImages-556421003-57a517d55f9b58974a959f14.jpg?fit=1200%2C748&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0GettyImages-556421003-57a517d55f9b58974a959f14.jpg?fit=1200%2C748&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0GettyImages-556421003-57a517d55f9b58974a959f14.jpg?fit=1200%2C748&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0GettyImages-556421003-57a517d55f9b58974a959f14.jpg?fit=1200%2C748&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":330502,"url":"https:\/\/climatescience.press\/?p=330502","url_meta":{"origin":330842,"position":1},"title":"New Study: China\u2019s Loess Plateau 7-8\u00b0C Warmer Than Today For Much Of The Last 4000 Years","author":"uwe.roland.gross","date":"29\/05\/2024","format":false,"excerpt":"Scientists refer to the Middle and Late Holocene\u2019s much warmer and wetter regional climate as \u201cfavorable,\u201d \u201coptimal\u201d and \u201cthe best.\u201d","rel":"","context":"In \"7.16\u00b0C warmer\"","block_context":{"text":"7.16\u00b0C warmer","link":"https:\/\/climatescience.press\/?tag=7-16c-warmer"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/05\/0after_restoration2c_hou_jia_gou2c_shaanxi2c_loess_plateau2c_china2c_2009.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/05\/0after_restoration2c_hou_jia_gou2c_shaanxi2c_loess_plateau2c_china2c_2009.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/05\/0after_restoration2c_hou_jia_gou2c_shaanxi2c_loess_plateau2c_china2c_2009.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/05\/0after_restoration2c_hou_jia_gou2c_shaanxi2c_loess_plateau2c_china2c_2009.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/05\/0after_restoration2c_hou_jia_gou2c_shaanxi2c_loess_plateau2c_china2c_2009.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":333324,"url":"https:\/\/climatescience.press\/?p=333324","url_meta":{"origin":330842,"position":2},"title":"Central Italy Was 3-4\u00b0C Warmer Than Today About 10,000 to 12,000 Years Ago","author":"uwe.roland.gross","date":"20\/06\/2024","format":false,"excerpt":"In a new study, scientists use the new \u201costracod-clumped isotope thermometer\u201d to reconstruct a much warmer Late Pleistocene\/Early Holocene Mediterranean climate.","rel":"","context":"In \"220-230 ppm range\"","block_context":{"text":"220-230 ppm range","link":"https:\/\/climatescience.press\/?tag=220-230-ppm-range"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/06\/037225813515_ba707da1a3_b.jpg?fit=1024%2C683&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/06\/037225813515_ba707da1a3_b.jpg?fit=1024%2C683&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/06\/037225813515_ba707da1a3_b.jpg?fit=1024%2C683&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/06\/037225813515_ba707da1a3_b.jpg?fit=1024%2C683&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":335660,"url":"https:\/\/climatescience.press\/?p=335660","url_meta":{"origin":330842,"position":3},"title":"An Giant Oyster Shell Discovery Suggests Early Holocene Seas Were 4\u00b0C (Up To 8\u00b0C) Warmer Than Today","author":"uwe.roland.gross","date":"06\/07\/2024","format":false,"excerpt":"Scientists continue to uncover evidence of a much warmer Early Holocene, when CO2 hovered near 260 ppm.","rel":"","context":"In \"Climate change\"","block_context":{"text":"Climate change","link":"https:\/\/climatescience.press\/?tag=climate-change"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/07\/07473483208_0af764dcab_b.jpg?fit=1024%2C683&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/07\/07473483208_0af764dcab_b.jpg?fit=1024%2C683&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/07\/07473483208_0af764dcab_b.jpg?fit=1024%2C683&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/07\/07473483208_0af764dcab_b.jpg?fit=1024%2C683&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":324615,"url":"https:\/\/climatescience.press\/?p=324615","url_meta":{"origin":330842,"position":4},"title":"Nature Publication: Researchers Find Arctic Region 10,000 Years Ago Warmer Than Today","author":"uwe.roland.gross","date":"29\/04\/2024","format":false,"excerpt":"Examined today is a paper appearing in the journal Nature Communications titled: \u201cSeasonal sea-ice in the Arctic\u2019s last ice area during the Early Holocene\u201d The authors looked at sea ice in the region of the Lincoln Sea, bordering northern Greenland and Canada, will be the final stronghold of perennial Arctic\u2026","rel":"","context":"In \"Arctic\"","block_context":{"text":"Arctic","link":"https:\/\/climatescience.press\/?tag=arctic"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/04\/0Melting_Sea_Ice.JPG_9iZp5pr.jpg?fit=1200%2C796&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/04\/0Melting_Sea_Ice.JPG_9iZp5pr.jpg?fit=1200%2C796&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/04\/0Melting_Sea_Ice.JPG_9iZp5pr.jpg?fit=1200%2C796&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/04\/0Melting_Sea_Ice.JPG_9iZp5pr.jpg?fit=1200%2C796&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/04\/0Melting_Sea_Ice.JPG_9iZp5pr.jpg?fit=1200%2C796&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":383096,"url":"https:\/\/climatescience.press\/?p=383096","url_meta":{"origin":330842,"position":5},"title":"Another Study Indicates China Was 7\u00b0C Warmer Than Today Throughout Much Of The Holocene","author":"uwe.roland.gross","date":"13\/06\/2025","format":false,"excerpt":"The evidence for a much warmer Mid-Holocene keeps accumulating.","rel":"","context":"In \"China\"","block_context":{"text":"China","link":"https:\/\/climatescience.press\/?tag=china"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/06\/008503bed72f4841bc090a3eab1147f0-1920.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/06\/008503bed72f4841bc090a3eab1147f0-1920.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/06\/008503bed72f4841bc090a3eab1147f0-1920.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/06\/008503bed72f4841bc090a3eab1147f0-1920.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/06\/008503bed72f4841bc090a3eab1147f0-1920.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/330842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/users\/121246920"}],"replies":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=330842"}],"version-history":[{"count":5,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/330842\/revisions"}],"predecessor-version":[{"id":330850,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/330842\/revisions\/330850"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/media\/330848"}],"wp:attachment":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=330842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=330842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=330842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}