{"id":256225,"date":"2023-05-06T14:43:20","date_gmt":"2023-05-06T12:43:20","guid":{"rendered":"https:\/\/climatescience.press\/?p=256225"},"modified":"2023-05-06T14:43:23","modified_gmt":"2023-05-06T12:43:23","slug":"west-antarctic-ice-sheet-retreated-far-inland-re-advanced-since-last-ice-age","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=256225","title":{"rendered":"West Antarctic Ice Sheet retreated far inland, re-advanced since last Ice Age"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

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

From Tallbloke’s Talkshop<\/a><\/p>\n\n\n\n

\u00a0May 2, 2023 by\u00a0oldbrew<\/strong><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

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

This research suggests natural climate variation in Antarctica has a much wider range than expected.<\/em>
\u2013 \u2013 \u2013
The West Antarctic Ice Sheet is melting rapidly, claims EurekAlert<\/a><\/em>, raising concerns it could cross a tipping point of irreversible retreat in the next few decades if global temperatures rise 1.5 to 2.0 degrees Celsius (2.7 to 3.8 degrees Fahrenheit) above pre-industrial levels.<\/p>\n\n\n\n

New research finds that 6,000 years ago, the grounded edge of the ice sheet may have been as far as 250 kilometers (160 miles) inland from its current location, suggesting the ice retreated deep into the continent after the end of the last ice age and re-advanced before modern retreat began.<\/p>\n\n\n\n

\u201cIn the last few thousand years before we started watching, ice in some parts of Antarctica retreated and re-advanced over a much larger area than we previously appreciated,\u201d said Ryan Venturelli, a paleoglaciologist at Colorado School of Mines and lead author of the new study. \u201cThe ongoing retreat of Thwaites Glacier is much faster than we\u2019ve ever seen before, but in the geologic record, we see the ice can recover.\u201d<\/p>\n\n\n\n

The study appears in AGU Advances, which publishes high-impact, open-access research and commentary across the Earth and space sciences. It presents the first geologic constraint for the ice sheet\u2019s location and movement since the last ice age.<\/p>\n\n\n\n

The grounding line is where a glacier or ice sheet leaves solid ground and begins to float on water as an ice shelf. Today, the Ross Ice Shelf extends hundreds of miles over the ocean from the grounding line of the West Antarctic Ice Sheet. Because ocean water washes up against the leading edge of the ice, the grounding line can be a zone of rapid melting.<\/p>\n\n\n\n

\u201cThe concern of grounded ice loss is because the loss of ice on land is what contributes to sea level rise,\u201d Venturelli said. \u201cAs grounding lines retreat farther inland, the more vulnerable the ice sheet becomes as it exposes thicker and thicker ice to the warming ocean.\u201d<\/p>\n\n\n\n

During the Last Glacial Maximum, about 20,000 years ago, the West Antarctic Ice Sheet was so large that it was grounded on the ocean floor, beyond the edge of the continent. Previous observations generally indicate a steady retreat since then, accelerated in the last century by human-caused climate change. [Talkshop comment \u2013 unsupported assertion]<\/em>.
. . .
The new evidence of Antarctic ice\u2019s ability to make a comeback was welcome news for Venturelli.<\/p>\n\n\n\n

\u201cIt can be a bummer sometimes, studying ice loss in Antarctica,\u201d Venturelli said. \u201cAlthough the re-advance identified in the geologic record happens over thousands of years, I like to think of studying the process of reversibility as a little shred of hope.\u201d<\/p>\n\n\n\n

The next big question for Venturelli and her coauthors is assessing what conditions enabled the ice\u2019s re-advance.<\/p>\n\n\n\n

One possibility is the rebound after release from the massive weight of the ice sheet lifted the land enough to hold back the ocean and allow the ice to regrow. Another possibility is that slight changes in climate enabled the ice sheet to switch from retreat to advance.<\/p>\n\n\n\n

It could have been a combination of these influences.<\/p>\n\n\n\n

Full article here<\/a>.<\/em><\/p>\n\n\n\n

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

This research suggests natural climate variation in Antarctica has a much wider range than expected.<\/p>\n","protected":false},"author":121246920,"featured_media":256229,"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":[691818326,691819356,691819357,691819355],"class_list":{"0":"post-256225","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-glacial-maximum","10":"tag-ross-ice-shelf","11":"tag-west-antarctic-ice-sheet","13":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/05\/001CLIMATE1-superJumbo.jpg?fit=2048%2C1152&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-14EF","jetpack-related-posts":[{"id":378593,"url":"https:\/\/climatescience.press\/?p=378593","url_meta":{"origin":256225,"position":0},"title":"Daily Mail Misses the Real Story About Long-Term Stable Antarctica Ice in Dumb Quip About Climate \u2018Deniers\u2019","author":"uwe.roland.gross","date":"16\/05\/2025","format":false,"excerpt":"A remarkably silly headline appeared last week in the\u00a0Daily Mail\u00a0stating: \u2018Shocking Antarctica discovery sends climate change deniers into mass celebration.\u2019 It appears that 100 gigatonnes of ice has been added to the Antarctica ice sheet in a 21-month period to December 2023. 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