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Global warming is accelerating internal tide speeds, with future projections showing a significant increase. This rise, driven by ocean stratification, may impact marine ecosystems and energy transfer.

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Area of Science:

  • Oceanography
  • Climate Science
  • Tidal Dynamics

Background:

  • Internal tides are crucial for ocean mixing and marine ecosystems.
  • Previous studies on internal tides were limited in scope and duration.
  • Long-term global data on internal tides are scarce, hindering understanding of climate change impacts.

Purpose of the Study:

  • To investigate the long-term global behavior of internal tides.
  • To assess the impact of global warming on internal tide speeds.
  • To identify the primary drivers of changes in internal tide dynamics.

Main Methods:

  • Utilized data from the Coupled Model Intercomparison Project Phase 6 (CMIP6).
  • Employed the High-Resolution Empirical Tidal (HRET) model for analysis.
  • Analyzed trends in globally averaged internal tide speeds over historical and future periods.

Main Results:

  • A significant accelerating trend in global internal tide speeds was identified.
  • Historical rates of increase were 0.4 cm/s per decade, projected to reach 2.0 cm/s per decade.
  • Intensified upper-ocean stratification is the primary driver, with background currents playing a secondary role.

Conclusions:

  • Internal tides are projected to propagate faster in a warming climate.
  • Accelerated internal tides could influence ocean energy cascades.
  • Changes in internal tides may have substantial effects on marine biological productivity.