{"id":352132,"date":"2024-11-23T16:30:00","date_gmt":"2024-11-23T15:30:00","guid":{"rendered":"https:\/\/climatescience.press\/?p=352132"},"modified":"2025-03-11T18:10:46","modified_gmt":"2025-03-11T17:10:46","slug":"global-warming-little-ice-age-cooling-and-sea-ice-expansion-is-still-ongoing-across-antarctica-today","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=352132","title":{"rendered":"\u00a0\u2018Global\u2019 Warming? Little Ice Age Cooling and Sea Ice Expansion Is Still Ongoing Across Antarctica Today"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

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

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

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

New research<\/a> indicates there has been no reduction in sea ice in Antarctica\u2019s Robertson Bay (Ross Sea) during the last century. Instead, the frigid Little Ice Age and its expanded sea ice conditions continue unabated through the 20th and 21st centuries.<\/strong><\/h4>\n\n\n\n

Between ~8000 and 3500 years before present the Antarctic ice sheet experienced several millennia of retreat and the sea ice extent surrounding the continent decreased throughout the Middle Holocene. For the next few millennia after that, or from about 3500 to 1500 years ago, the ice sheet and sea ice extent advanced to near modern levels.<\/p>\n\n\n\n

\u201cThe East and West Antarctic ice sheets underwent rapid periods of retreat in the Ross Embayment, the continent\u2019s largest ice drainage basin, between 8 and 3.5 calkyr BP. Recent work shows that retreat was followed by a period of readvance and the ice sheets reached their modern configurations during the late Holocene.\u201d<\/em><\/p>\n\n\n\n

During the Medieval Warm Period, or from approximately 1500 to 700 years before present, variations in\u00a0F. curta<\/em>\u00a0diatom, a proxy for sea ice extent, indicate Antarctic Sea ice retreated again to its much lower (<40%) Middle Holocene levels.<\/p>\n\n\n\n

\u201c\u2026during the period between 1.5 and 0.7 calkyr BP\u2026lower F. curta abundance in Robertson Bay (<40%) is characteristic of a reduction in spring sea ice concentration and a longer summer open water season.\u201d<\/em><\/p>\n\n\n\n

Then, after the Medieval Warm Period ended, Antarctica\u2019s Little Ice Age (LIA) cooling began. The ice sheet grew and sea ice advanced to the highest levels of the last 7000 years (~60%).<\/p>\n\n\n\n

The relative abundance of F. curta<\/em> over the last 700 years indicate these icy LIA conditions have persisted to the present day. Sea ice has been increasing (with no declining long-term trend) since the late 1970s<\/a><\/strong>, which is consistent with significant (>1\u00b0C) cooling trends in this region during recent decades<\/a><\/strong>.<\/p>\n\n\n\n

\u201c\u2026an increase in the seasonal duration of sea ice between 0.7 calkyr BP [~700 years ago] and the present [is] consistent with ice core temperature reconstructions of cooling atmospheric temperatures.\u201d<\/em><\/p>\n\n\n\n

\"\"
Image Source:\u00a0Truax et al., 2024<\/a><\/strong><\/figcaption><\/figure>\n\n\n\n

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

New research\u00a0indicates there has been no reduction in sea ice in Antarctica\u2019s Robertson Bay (Ross Sea) during the last century. Instead, the frigid Little Ice Age and its expanded sea ice conditions continue unabated through the 20th and 21st centuries.<\/p>\n","protected":false},"author":121246920,"featured_media":352136,"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":[691818326,691818087,691831636,691826956],"class_list":{"0":"post-352132","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-antarctica","9":"tag-global-warming","10":"tag-ice-age-cooling","11":"tag-middle-holocene","13":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/11\/0-Antarctica-123.jpg?fit=1650%2C1101&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1tBy","jetpack-related-posts":[{"id":318919,"url":"https:\/\/climatescience.press\/?p=318919","url_meta":{"origin":352132,"position":0},"title":"Global Cooling wipes out Elephant Seals and Penguin colonies from warmer Antarctica, 1,000 years ago","author":"uwe.roland.gross","date":"19\/04\/2024","format":false,"excerpt":"Where are the tears? 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