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  • American Association for the Advancement of Science (AAAS)  (4)
  • Air and Waste Managment Association Publication
  • 1
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    Mid-Pleistocene transition in glacial cycles explained by declining CO2 and regolith removal (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉Variations in Earth’s orbit pace the glacial-interglacial cycles of the Quaternary, but the mechanisms that transform regional and seasonal variations in solar insolation into glacial-interglacial cycles are still elusive. Here, we present transient simulations of coevolution of climate, ice sheets, and carbon cycle over the past 3 million years. We show that a gradual lowering of atmospheric CO〈sub〉2〈/sub〉 and regolith removal are essential to reproduce the evolution of climate variability over the Quaternary. The long-term CO〈sub〉2〈/sub〉 decrease leads to the initiation of Northern Hemisphere glaciation and an increase in the amplitude of glacial-interglacial variations, while the combined effect of CO〈sub〉2〈/sub〉 decline and regolith removal controls the timing of the transition from a 41,000- to 100,000-year world. Our results suggest that the current CO〈sub〉2〈/sub〉 concentration is unprecedented over the past 3 million years and that global temperature never exceeded the preindustrial value by more than 2°C during the Quaternary.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    The influence of vegetation-atmosphere-ocean interaction on climate during the mid-holocene (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-25
    Description: Simulations with a synchronously coupled atmosphere-ocean-vegetation model show that changes in vegetation cover during the mid-Holocene, some 6000 years ago, modify and amplify the climate system response to an enhanced seasonal cycle of solar insolation in the Northern Hemisphere both directly (primarily through the changes in surface albedo) and indirectly (through changes in oceanic temperature, sea-ice cover, and oceanic circulation). The model results indicate strong synergistic effects of changes in vegetation cover, ocean temperature, and sea ice at boreal latitudes, but in the subtropics, the atmosphere-vegetation feedback is most important. Moreover, a reduction of the thermohaline circulation in the Atlantic Ocean leads to a warming of the Southern Hemisphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ganopolski -- Kubatzki -- Claussen -- Brovkin V -- Petoukhov V -- New York, N.Y. -- Science. 1998 Jun 19;280(5371):1916-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉A. Ganopolski, C. Kubatzki, V. Brovkin, Potsdam-Institut fur Klimafolgenforschung, Postfach 601203, D-14412 Potsdam, Germany. M. Claussen, Potsdam-Institut fur Klimafolgenforschung, Postfach 601203, D-14412 Potsdam, Germany and Institut.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9632385" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Nonlinear climate sensitivity and its implications for future greenhouse warming (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-11-11
    Description: Global mean surface temperatures are rising in response to anthropogenic greenhouse gas emissions. The magnitude of this warming at equilibrium for a given radiative forcing—referred to as specific equilibrium climate sensitivity ( S )—is still subject to uncertainties. We estimate global mean temperature variations and S using a 784,000-year-long field reconstruction of sea surface temperatures and a transient paleoclimate model simulation. Our results reveal that S is strongly dependent on the climate background state, with significantly larger values attained during warm phases. Using the Representative Concentration Pathway 8.5 for future greenhouse radiative forcing, we find that the range of paleo-based estimates of Earth’s future warming by 2100 CE overlaps with the upper range of climate simulations conducted as part of the Coupled Model Intercomparison Project Phase 5 (CMIP5). Furthermore, we find that within the 21st century, global mean temperatures will very likely exceed maximum levels reconstructed for the last 784,000 years. On the basis of temperature data from eight glacial cycles, our results provide an independent validation of the magnitude of current CMIP5 warming projections.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Mid-Pleistocene transition in glacial cycles explained by declining CO2and regolith removal (2019)
    American Association for the Advancement of Science (AAAS)
    In:  Science Advances, 5 (4). eaav7337.
    Details
    Publication Date: 2021-01-08
    Description: Variations in Earth’s orbit pace the glacial-interglacial cycles of the Quaternary, but the mechanisms that transform regional and seasonal variations in solar insolation into glacial-interglacial cycles are still elusive. Here, we present transient simulations of coevolution of climate, ice sheets, and carbon cycle over the past 3 million years. We show that a gradual lowering of atmospheric CO2 and regolith removal are essential to reproduce the evolution of climate variability over the Quaternary. The long-term CO2 decrease leads to the initiation of Northern Hemisphere glaciation and an increase in the amplitude of glacial-interglacial variations, while the combined effect of CO2 decline and regolith removal controls the timing of the transition from a 41,000- to 100,000-year world. Our results suggest that the current CO2 concentration is unprecedented over the past 3 million years and that global temperature never exceeded the preindustrial value by more than 2°C during the Quaternary.
    Type: Article , PeerReviewed
    Format: text
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  • 5
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    A Relationship between Regional and Global GCM Surface Air Temperature Changes and its Application to an Integrated Model of Climate Change (1994)
    Air and Waste Managment Association Publication
    In:  A Relationship between Regional and Global GCM Surface Air Temperature Changes and its Application to an Integrated Model of Climate Change
    Details
    Publication Date: 2022-03-21
    Type: info:eu-repo/semantics/conferenceObject
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