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The Subpolar North Atlantic Ocean Heat Content Variability and its Decomposition.

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The Subpolar North Atlantic Ocean heat content is linked to global climate and the Atlantic Meridional Overturning Circulation. Recent warming hiatus may be due to this region acting as a planetary heat sink.

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Area of Science:

  • Climate Science
  • Oceanography
  • Earth System Science

Background:

  • The Subpolar North Atlantic (SPNA) plays a crucial role in global climate regulation.
  • Its ocean heat content (OHC) is strongly correlated with the Atlantic Meridional Overturning Circulation (AMOC).
  • The SPNA is considered a significant planetary heat sink, potentially explaining the recent global surface warming hiatus.

Purpose of the Study:

  • To investigate the spatial disparities in SPNA ocean heat content (OHC) after 1996.
  • To understand the drivers of OHC changes in the western and eastern SPNA.
  • To clarify the role of SPNA OHC in the recent global warming hiatus.

Main Methods:

  • Analysis of ocean heat content (OHC) data in the Subpolar North Atlantic (SPNA).
  • Temperature decomposition to identify drivers of OHC changes.
  • Investigation of the influence of North Atlantic Oscillation (NAO), heat flux, wind forcing, and isopycnal undulation.

Main Results:

  • Post-1996 OHC spatial disparities in the SPNA were not explained by the North Atlantic Oscillation (NAO).
  • Western SPNA OHC is primarily driven by along-isopycnal changes, dominated by heat flux.
  • Eastern SPNA OHC is influenced by both along-isopycnal changes and isopycnal undulation, with significant wind forcing effects.

Conclusions:

  • The SPNA's OHC dynamics are complex and regionally variable.
  • Along-isopycnal OHC changes can induce heaving, masking additional ocean heat during warming hiatus periods.
  • Understanding SPNA OHC is critical for comprehending global climate variability and heat distribution.