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Predicting the ocean carbon sink is challenging due to decadal CO2 uptake variations. This study shows ocean carbon uptake is predictable up to 5 years, with temperature driving short-term predictions and other factors driving longer-term ones.

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Area of Science:

  • Oceanography
  • Climate Science
  • Carbon Cycle Research

Background:

  • Decadal variations in oceanic carbon dioxide (CO2) uptake complicate predictions of the ocean carbon sink.
  • Accurate forecasting of the ocean's capacity to absorb atmospheric CO2 is crucial for climate modeling.

Purpose of the Study:

  • To develop and validate a decadal prediction system for oceanic CO2 uptake.
  • To identify drivers of predictability in ocean carbon uptake variations.

Main Methods:

  • Assimilation of atmospheric and oceanic observational data into an Earth system model.
  • Utilizing a decadal prediction system to reproduce observed global ocean CO2 uptake variations.

Main Results:

  • The study successfully reproduces observed decadal variations in global ocean CO2 uptake.
  • Ocean CO2 uptake shows predictability up to 2 years globally, with regional predictability extending to 5 years.
  • Temperature variations influence predictability for periods less than 3 years.

Conclusions:

  • Ocean carbon uptake variations are predictable, offering improved forecasting capabilities.
  • Non-thermal drivers, particularly in high latitudes, are key to longer-term predictability (>3 years).
  • This research enhances our understanding of the ocean carbon sink dynamics and its role in climate regulation.