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  • 1
    Online Resource
    Online Resource
    Can the Miocene climate inform the future?
    American Association for the Advancement of Science (AAAS) ; 2022
    In:  Science Vol. 377, No. 6601 ( 2022-07), p. 26-27
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 377, No. 6601 ( 2022-07), p. 26-27
    Abstract: Atmospheric CO 2 concentrations are rapidly rising. To reliably predict the future, researchers have looked at past climates with comparable CO 2 concentrations, dating back millions of years. Although these past climates are not perfect analogs of the future, they still provide information about how the climate system functions under increased CO 2 concentrations. Because there are no direct observations of past climate states, climate variables need to be inferred from geological data, generally referred to as proxies. On page 116 of this issue, Herbert et al. ( 1 ) present a reconstruction of the evolution of atmospheric CO 2 concentration over the past 20 million years. Their data provide a consistent explanation for the long-term evolution of global temperature and ice sheets on Earth and give a glimpse into its climate future.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.abq6542
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2022
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Highly restricted near‐surface permafrost extent during the mid-Pliocene warm period
    Proceedings of the National Academy of Sciences ; 2023
    In:  Proceedings of the National Academy of Sciences Vol. 120, No. 36 ( 2023-09-05)
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 120, No. 36 ( 2023-09-05)
    Abstract: Accurate understanding of permafrost dynamics is critical for evaluating and mitigating impacts that may arise as permafrost degrades in the future; however, existing projections have large uncertainties. Studies of how permafrost responded historically during Earth’s past warm periods are helpful in exploring potential future permafrost behavior and to evaluate the uncertainty of future permafrost change projections. Here, we combine a surface frost index model with outputs from the second phase of the Pliocene Model Intercomparison Project to simulate the near‐surface (~3 to 4 m depth) permafrost state in the Northern Hemisphere during the mid-Pliocene warm period (mPWP, ~3.264 to 3.025 Ma). This period shares similarities with the projected future climate. Constrained by proxy-based surface air temperature records, our simulations demonstrate that near‐surface permafrost was highly spatially restricted during the mPWP and was 93 ± 3% smaller than the preindustrial extent. Near‐surface permafrost was present only in the eastern Siberian uplands, Canadian high Arctic Archipelago, and northernmost Greenland. The simulations are similar to near‐surface permafrost changes projected for the end of this century under the SSP5-8.5 scenario and provide a perspective on the potential permafrost behavior that may be expected in a warmer world.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.2301954120
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2023
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
    SSG: 12
    Location Call Number Limitation Availability
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