{"id":158350,"date":"2026-05-18T18:20:24","date_gmt":"2026-05-18T18:20:24","guid":{"rendered":"https:\/\/vale50plus.org\/clone\/study-finds-arctic-was-ice-free-year-round-14000-years-ago-at-far-lower-co2-levels\/"},"modified":"2026-05-18T18:20:25","modified_gmt":"2026-05-18T18:20:25","slug":"study-finds-arctic-was-ice-free-year-round-14000-years-ago-at-far-lower-co2-levels","status":"publish","type":"post","link":"https:\/\/vale50plus.org\/clone\/study-finds-arctic-was-ice-free-year-round-14000-years-ago-at-far-lower-co2-levels\/","title":{"rendered":"Study Finds Arctic Was Ice-Free Year-Round 14,000 Years Ago At Far Lower CO2 Levels"},"content":{"rendered":"

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\"arctic<\/a>
New research<\/a> utilizing the DNA of dinoflagellate (Polarella glacialis<\/em>) indicates that, 14,000 years ago, when the atmospheric CO2 concentration is thought to have been 230 ppm, the studied Arctic region (Yermak Plateau) was sea ice-free year-round. [some emphasis, links added]<\/p>\n

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\u201cAround 14.0-13.9 cal kyr BP, a short-lived year-round, ice-free, open ocean occurred.\u201d<\/strong><\/p>\n<\/blockquote>\n

During the Early to Middle Holocene (10,000 to 4,000 years ago), Arctic sea ice was seasonal, dominated by first-year ice that did not survive the summer melt season<\/a>.<\/p>\n

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\u201cThe Holocene Yermak Plateau is characterized by a seasonal sea ice cover, which may consist mainly of first-year sea ice \u2026 a large part of first-year ice, as opposed to seasonally drifted multi-year ice.\u201d<\/p>\n<\/blockquote>\n

Today, at 430 ppm CO2, Arctic sea ice is increasingly first-year, but a \u201cmulti-year environment\u201d persists.<\/p>\n

Multi-year sea ice has survived at least one summer melt season, and it continues to thicken over multiple years.<\/strong><\/p>\n

The current phase is similar to the sea ice conditions<\/a> that predominated ~16,000 years ago, or during the last glacial.<\/p>\n

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\u201c\u2026a marginal sea ice cover ca. 16 cal kyr BP [characterized by] first-year sea ice in a multi-year sea ice environment, a setting not unlike today.\u201d<\/p>\n<\/blockquote>\n

If the Arctic Ocean can be ice-free year-round when CO2 was 230 ppm, but is dominated by multi-year ice when CO2 concentration is 430 ppm, this does not support the alarmist claims that high CO2 concentrations are responsible for enhanced Arctic sea ice melt<\/a>.<\/p>\n

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Image Source: Mayers et al., 2026<\/a><\/strong><\/figcaption><\/figure>\n

Read more at No Tricks Zone<\/a><\/strong><\/p>\n

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

New research utilizing the DNA of dinoflagellate (Polarella glacialis) indicates that, 14,000 years ago, when the atmospheric CO2 concentration is thought to have been 230 ppm, the studied Arctic region…<\/p>\n","protected":false},"author":3,"featured_media":158351,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_lmt_disableupdate":"","_lmt_disable":"","episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","fifu_image_url":"https:\/\/i0.wp.com\/climatechangedispatch.com\/wp-content\/uploads\/2026\/05\/arctic-summer-sea-ice.jpg?resize=500%2C355&ssl=1","fifu_image_alt":"","_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}},"categories":[14,29],"tags":[],"class_list":["post-158350","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate","category-recentpost"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatechangedispatch.com\/wp-content\/uploads\/2026\/05\/arctic-summer-sea-ice.jpg?resize=500%2C355&ssl=1","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"publishpress_future_action":{"enabled":true,"date":"2026-11-18 18:20:25","action":"change-status","newStatus":"trash","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/posts\/158350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/comments?post=158350"}],"version-history":[{"count":0,"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/posts\/158350\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/media\/158351"}],"wp:attachment":[{"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/media?parent=158350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/categories?post=158350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vale50plus.org\/clone\/wp-json\/wp\/v2\/tags?post=158350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}