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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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Global-scale random bottom pressure fluctuations from oceanic intrinsic variability.

Mengnan Zhao1, Rui M Ponte1, Thierry Penduff2

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Ocean bottom pressure variability is influenced by intrinsic ocean processes. A newly discovered global mode of ocean bottom pressure variability is driven by localized eddy dynamics near Drake Passage.

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Area of Science:

  • Oceanography
  • Fluid Dynamics
  • Climate Science

Background:

  • Intrinsic ocean processes, like mesoscale turbulence, significantly impact ocean bottom pressure (pb) variations.
  • These processes can generate variability across larger scales via inverse energy cascades or baroclinic instability.

Purpose of the Study:

  • To identify and characterize a global-scale intrinsic mode of ocean bottom pressure variability.
  • To elucidate the underlying mechanism driving this mode on monthly timescales.

Main Methods:

  • Analysis of oceanographic model outputs.
  • Investigation of intrinsic variability modes.
  • Examination of eddy-driven dynamics and barotropic wave propagation.

Main Results:

  • A global-scale intrinsic mode of ocean bottom pressure variability at monthly timescales was identified.
  • This mode exhibits maximum amplitudes near Drake Passage, with opposing polarity between the Southern Ocean and the Atlantic/Arctic oceans.
  • The mechanism involves localized eddy-driven pb anomalies near Drake Passage, propagating via barotropic waves.

Conclusions:

  • A novel global intrinsic mode of ocean bottom pressure variability has been discovered.
  • This mode is driven by localized eddy dynamics and subsequent barotropic wave adjustments.
  • The findings align with observed ocean bottom pressure variability patterns.