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Enhanced phosphorus weathering contributed to Late Miocene cooling.

Yi Zhong1,2, Zhiguo Li3, Xuefa Shi4

  • 1Centre for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China. zhongy@sustech.edu.cn.

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Late Miocene cooling was driven by increased phosphorus weathering, which lowered atmospheric carbon dioxide (CO2) levels. This study reveals a significant decoupling of phosphorus and silicate weathering during this major carbon cycle event.

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Area of Science:

  • Paleoceanography
  • Climate Science
  • Geochemistry

Background:

  • Understanding Late Miocene climate evolution is crucial for assessing Earth's climate sensitivity under warmer-than-modern conditions.
  • The mechanisms behind Late Miocene cooling (7-5.4 million years ago) and associated carbon cycle changes remain unclear.

Purpose of the Study:

  • To investigate the driving mechanisms of Late Miocene climate and carbon cycle shifts.
  • To elucidate the causes of the Late Miocene cooling event.

Main Methods:

  • Analysis of magnetic and geochemical paleoceanographic proxies from a hydrogenetic ferromanganese crust.
  • Utilized a global biogeochemical model to simulate climate and carbon cycle dynamics.

Main Results:

  • A 50% increase in deep ocean phosphorus concentrations was observed between 7 and 4 million years ago.
  • This phosphorus surge coincided with enhanced deep ocean oxygen consumption.
  • Increased continental phosphorus weathering, uncoupled from silicate weathering, led to decreased atmospheric CO2 and cooling.

Conclusions:

  • Continental phosphorus weathering played a key role in the Late Miocene cooling event.
  • A significant decoupling of phosphorus and silicate weathering occurred during this period.
  • This finding provides insights into major carbon cycling events over the last 10 million years.