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Multiple tropical Andean glaciations during a period of late Pliocene warmth

Multiple tropical Andean glaciations during a period of late Pliocene warmth Roberts, Nicholas J.; Barendregt, René W.; Clague, John J. The extent and behaviour of glaciers during the mid-Piacenzian warm period illustrate the sensitivity of the cryosphere to atmospheric CO2 concentrations above pre-industrial levels. Knowledge of glaciation during this period is restricted to globally or regionally averaged records from marine sediments and to sparse terrestrial glacial deposits in mid-to-high latitudes. Here we expand the Pliocene glacial record to the tropics by reporting recurrent large-scale glaciation in the Bolivian Andes based on stratigraphic and paleomagnetic analysis of a 95-m sequence of glacial sediments underlying the 2.74-Ma Chijini Tuff. Paleosols and polarity reversals separate eight glacial diamictons, which we link to cold periods in the benthic oxygen isotope record. The glaciations appear to coincide with the earliest glacial activity at high northern latitudes and with events in Antarctica, including the strong M2 cold peak and terminal Pliocene climate deterioration. This concordance suggests inter-hemispheric climate linkages during the late Pliocene and requires that the Central Andes were at least as high in the late Pliocene as today. Our record fills a critical gap in knowledge of Earth systems during the globally warm mid-Piacenzian and suggests a possible driver of faunal migration preceding the large-scale biotic interchange in the Americas during the earliest Pleistocene. Sherpa Romeo green journal. Open access article. Creative Commons Attribution 4.0 International License (CC by 4.0) applies




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U.S. Army bioengineer develops high-tech fabrics to keep soldiers warm, dry, and safe

Paola D’Angelo discusses how her team develops high-performance textiles to protect and support soldiers on the battlefield




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Warmer world could feed the oceans

Higher temperatures allow nitrogen-fixing microbe to work better even when iron is scarce




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Nitrous oxide from Tibetan permafrost packs global warming punch

Scientists estimate that thawing ground could be a major source of the greenhouse gas




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Nitrous oxide from Tibetan permafrost packs global warming punch

Scientists estimate that thawing ground could be a major source of the greenhouse gas




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Warm up with these 5 winter cocktails this season




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First locust swarm seen in Punjab border villages, neutralised





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Arctic voyage captures global warming impact on ice, animals in these astounding pictures




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Happy Makar Sankranti 2020: Wish your loved ones with these heartwarming messages




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Global warming will lead to civil wars, worsen security woes: UN



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Global warming threatens more deadly Everest-like avalanches, says report



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Five things to know about coal trade, global warming



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Barack Obama urges world to follow US lead on global warming



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Volcanic eruptions partly behind ‘warming hiatus’



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Merkel wants G7 to commit to 2-degree global warming goal



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Scientists warn of a vicious global warming cycle, raise permafrost alarm at UN climate talks



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Global warming may eat up USD 200 billion crops globally by 2050: Study



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Lukewarm response to ‘5 shops in one lane’ rule as BMC rolls back order





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North Korea’s Kim Jong Un sends ‘warm greetings’ to China’s Xi: Report




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Virat Kohli warms up with Men in Blue in Pune ahead of India’s second Test




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IND vs NZ Warm-Up: Jasprit Bumrah, Mohammed Shami show resilience, lead fightback




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MS Dhoni gets warm reception from fans in CSK’s first training session