{"id":258236,"date":"2023-05-20T14:32:26","date_gmt":"2023-05-20T12:32:26","guid":{"rendered":"https:\/\/climatescience.press\/?p=258236"},"modified":"2023-05-20T14:32:29","modified_gmt":"2023-05-20T12:32:29","slug":"study-warm-ice-age-changed-climate-cycles","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=258236","title":{"rendered":"Study: ‘Warm ice age’ changed climate cycles"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

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

From\u00a0Phys.org<\/a><\/em><\/p>\n\n\n\n

By\u00a0Heidelberg University<\/a><\/p>\n\n\n\n

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

Long-term expansion of Mediterranean forests and increase in precipitation as well as an enhanced East Asian summer monsoon associated with the increase and northward migration of the Atlantic moisture source. Paradoxically, the glacial was warmer and wetter than the preceding interglacial. Credit: Andr\u00e9 Bahr<\/p>\n\n\n\n

Approximately 700,000 years ago, a “warm ice age” permanently changed the climate cycles on Earth. Contemporaneous with this exceptionally warm and moist period, the polar glaciers greatly expanded. A European research team including Earth scientists from Heidelberg University used recently acquired geological data in combination with computer simulations to identify this seemingly paradoxical connection.<\/p>\n\n\n\n

According to the researchers, this profound change in the Earth’s climate was responsible for the change in the climate cycles, thus representing a critical step in the later climate evolution of our planet. Their study is published in the journal Nature Communications<\/em>.<\/p>\n\n\n\n

Geological ice ages\u2014called glacial periods\u2014are characterized by the development of large ice sheets in the Northern Hemisphere. In the past 700,000 years, phases shifted between distinct glacial and warm periods about every 100,000 years. Before then, however, the Earth’s climate was governed by 40,000-year cycles with shorter and weaker glacial periods<\/a>. The change in the climate cycles<\/a> occurred in the Middle Pleistocene Transition period, which began approximately 1.2 million years ago and ended about 670,000 years ago.<\/p>\n\n\n\n

“The mechanisms responsible for this critical change in the global climate rhythm remain largely unknown. They cannot be attributed to variations in the orbital parameters governing the Earth’s climate,” explains Associate Professor Dr. Andr\u00e9 Bahr of the Institute of Earth Sciences at Heidelberg University. “But the recently identified ‘warm ice age,’ which caused the accumulation of excess continental ice, did play a critical role.”<\/p>\n\n\n\n

For their investigations, the researchers used new climate records from a drill core off Portugal and loess records from the Chinese Plateau. The data was then fed into computer simulations<\/a>. The models show a long-term warming and wetting trend in both subtropical regions<\/a> for the past 800,000 to 670,000 years.<\/p>\n\n\n\n

Contemporaneous with this last ice age in the Middle Pleistocene Transition period, the sea surface temperatures<\/a> in the North Atlantic and tropical North Pacific were warmer than in the preceding interglacial, the phase between the two ice ages. This led to higher moisture production and rainfall in Southwest Europe, the expansion of Mediterranean forests, and an enhanced summer monsoon in East Asia. The moisture also reached the polar regions where it contributed to the expansion of the Northern Eurasian ice sheets.<\/p>\n\n\n\n

“They persisted for some time and heralded in the phase of sustained and far-reaching ice-age glaciation that lasted until the late Pleistocene. Such expansion of the continental glaciers was necessary to trigger the shift from the 40,000-year cycles to the 100,000-year cycles we experience today, which was critical for the Earth’s later climate evolution,” states Andr\u00e9 Bahr.<\/p>\n\n\n\n

More information:<\/strong> Mar\u00eda Fernanda S\u00e1nchez Go\u00f1i et al, Moist and warm conditions in Eurasia during the last glacial of the Middle Pleistocene Transition, Nature Communications<\/em> (2023). DOI: 10.1038\/s41467-023-38337-4<\/a><\/p>\n\n\n\n

Journal information:<\/strong> Nature Communications<\/a> <\/a><\/p>\n\n\n\n

Provided by Heidelberg University<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"

Approximately 700,000 years ago, a “warm ice age” permanently changed the climate cycles on Earth. <\/p>\n","protected":false},"author":121246920,"featured_media":258241,"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":[691818056,691819656],"class_list":{"0":"post-258236","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-climate-change","9":"tag-climate-cycles","11":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/05\/0Screen-Shot-2019-11-13-at-10.29.31-AM-1-1024x618-1.png?fit=1024%2C618&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-15b6","jetpack-related-posts":[{"id":404332,"url":"https:\/\/climatescience.press\/?p=404332","url_meta":{"origin":258236,"position":0},"title":"New Study: Modern Warmth Is Merely Part Of A Natural Cycle","author":"uwe.roland.gross","date":"23\/09\/2025","format":false,"excerpt":"Throughout the last 10,000 years there have globally been much warmer and more extensive iceless periods than observed in the modern era.","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\/2025\/09\/AQPgrn3ZxLw-CC_stfvn7rJ47kfQxsjoV7PqjmMBp8bsFPEV6Vo0YWnQM5FkNZu9fKhNAdxluHF5h4eTZOw_Cp8py10ce6c03OUVI0zvCqEossoYJmBU9gdMdGWS1KxORMrLSrQz1LqWL-T2W5A9zR-luiNHaA.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQPgrn3ZxLw-CC_stfvn7rJ47kfQxsjoV7PqjmMBp8bsFPEV6Vo0YWnQM5FkNZu9fKhNAdxluHF5h4eTZOw_Cp8py10ce6c03OUVI0zvCqEossoYJmBU9gdMdGWS1KxORMrLSrQz1LqWL-T2W5A9zR-luiNHaA.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQPgrn3ZxLw-CC_stfvn7rJ47kfQxsjoV7PqjmMBp8bsFPEV6Vo0YWnQM5FkNZu9fKhNAdxluHF5h4eTZOw_Cp8py10ce6c03OUVI0zvCqEossoYJmBU9gdMdGWS1KxORMrLSrQz1LqWL-T2W5A9zR-luiNHaA.jpeg?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQPgrn3ZxLw-CC_stfvn7rJ47kfQxsjoV7PqjmMBp8bsFPEV6Vo0YWnQM5FkNZu9fKhNAdxluHF5h4eTZOw_Cp8py10ce6c03OUVI0zvCqEossoYJmBU9gdMdGWS1KxORMrLSrQz1LqWL-T2W5A9zR-luiNHaA.jpeg?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQPgrn3ZxLw-CC_stfvn7rJ47kfQxsjoV7PqjmMBp8bsFPEV6Vo0YWnQM5FkNZu9fKhNAdxluHF5h4eTZOw_Cp8py10ce6c03OUVI0zvCqEossoYJmBU9gdMdGWS1KxORMrLSrQz1LqWL-T2W5A9zR-luiNHaA.jpeg?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":289923,"url":"https:\/\/climatescience.press\/?p=289923","url_meta":{"origin":258236,"position":1},"title":"Changing History to Control You","author":"uwe.roland.gross","date":"04\/12\/2023","format":false,"excerpt":"The climate alarmists state that there was no Little Ice Age, No Medieval Warm Period or even Roman Warm Period. 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