Dust fertilizes diatom blooms in favor of CO2 drawdown at the onset of Antarctic glaciation
编号:1375 访问权限:仅限参会人 更新:2025-01-05 11:15:20 浏览:195次 张贴报告

报告开始:2025年01月16日 18:50(Asia/Shanghai)

报告时间:15min

所在会场:[S42] Session 42-Deep-Time Ocean and Climate Changes: Insights from Models and Proxies [S42-P] Deep-Time Ocean and Climate Changes: Insights from Models and Proxies

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摘要
The Eocene-Oligocene Transition (EOT) marks a significant shift in Earth's climate from the warm conditions of the Eocene to the cooler, icehouse climate of the Oligocene, representing a pivotal environmental change during the Cenozoic era. Using full coupled Earth system models (CESM1.2), we find that the increase in dust after the EOT significantly contributed to the decline in global temperature, as well as the increase in ocean productivity and diatom biomass in the Southern Ocean. Firstly, dust can affect the Earth's radiation balance by directly scattering and absorbing solar radiation, leading to surface cooling. Second, the increased dust deposition post-EOT, which significantly impacted marine productivity and diatom abundance. The Southern Ocean received iron-rich dust, which  reduced the iron limitation on phytoplankton growth, particularly diatoms, a major contributor to carbon export to the deep ocean. Increased diatom productivity not only enhance the biological pump but also contribute to the long-term sequestration of carbon dioxide, thus reinforcing global cooling trends. Combining sediment cores and proxies for dust and ocean productivity, as well as reconstructed diatom records, this study quantitatively modeled the evolution of the earth system response to dust before and after the EOT. The results highlight the multifaceted role of dust in the Eocene-Oligocene climate transition. These findings contribute to a deeper understanding of the complex interactions between the atmosphere-land and the marine biosphere, highlighting the importance of dust in global climate and marine biogeochemical processes.
关键词
Eocene-Oligocene transition, dust, diatom, Antarctic glaciation
报告人
Yihui Chen
PhD Peking University

稿件作者
Yihui Chen Peking University
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重要日期
  • 会议日期

    01月13日

    2025

    01月17日

    2025

  • 09月27日 2024

    初稿截稿日期

  • 01月17日 2025

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
承办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
Department of Earth Sciences, National Natural Science Foundation of China
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