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Intermittency in phytoplankton bloom triggered by modulations in vertical stability.

Madhavan Girijakumari Keerthi1, Marina Lévy2, Olivier Aumont2

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Wind bursts significantly influence seasonal surface chlorophyll (SChl) blooms by altering vertical stability. These subseasonal variations impact light exposure and dilution, affecting bloom dynamics and marine ecosystems.

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Area of Science:

  • Marine Ecology
  • Oceanography
  • Remote Sensing

Background:

  • Seasonal surface chlorophyll (SChl) blooms exhibit complex subseasonal variations not fully explained by traditional bloom paradigms.
  • Understanding these fluctuations is crucial for accurately modeling marine primary production and carbon export.

Purpose of the Study:

  • To investigate the role of subseasonal factors, specifically wind bursts, in driving seasonal surface chlorophyll (SChl) bloom dynamics.
  • To link atmospheric forcing to phytoplankton bloom onset and variability on weekly timescales.

Main Methods:

  • Utilized two decades of satellite-derived SChl data.
  • Integrated atmospheric reanalysis data for wind stress and net heat flux.
  • Analyzed SChl fluctuations in relation to weekly changes in atmospheric forcing in the Northwestern Mediterranean Sea.

Main Results:

  • Weekly SChl fluctuations were found to be synchronized with weekly changes in wind stress and net heat flux during winter and early spring bloom initiation.
  • This synchronization supports the expansion of the convection shutdown hypothesis to subseasonal timescales.
  • Intermittency in vertical stability, driven by short-term weather variations (calm or stormy), was identified as a key mechanism.

Conclusions:

  • Subseasonal wind bursts play a leading role in SChl bloom dynamics, influencing light exposure and vertical dilution.
  • These findings highlight the importance of considering short-term atmospheric forcing for understanding bloom onset and variability.
  • The identified intermittency in phytoplankton blooms has potential significant implications for carbon export and marine trophic structures.