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Coastal warming and wind-driven upwelling: A global analysis.

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Area of Science:

  • Oceanography
  • Climate Science
  • Marine Ecology

Background:

  • Long-term sea surface temperature (SST) warming trends exhibit significant spatial heterogeneity.
  • Disparities in warming trends are particularly notable between coastal and oceanic regions.

Purpose of the Study:

  • To analyze and compare long-term SST warming trends at global coastal and oceanic locations.
  • To investigate the influence of oceanic processes, such as upwelling, on nearshore temperature changes.

Main Methods:

  • Utilized NOAA's AVHRR OISST data for the period 1982-2015.
  • Analyzed SST trends at approximately 3500 worldwide coastal points and their oceanic counterparts.
  • Employed a spatial resolution of 0.25 arc-degrees for detailed trend assessment.

Main Results:

  • Significant SST warming was observed at most analyzed locations.
  • Coastal locations, particularly in upwelling regions, exhibited lower warming trends (92% of cases) compared to adjacent oceanic areas.
  • Demonstrated distinct differences in warming rates between coastal and oceanic environments.

Conclusions:

  • Upwelling plays a crucial role in buffering the impacts of global warming in nearshore environments.
  • These findings have substantial oceanographic, climatic, and biogeographic implications for coastal ecosystems.
  • The heterogeneous nature of SST warming necessitates region-specific climate change impact assessments.