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Cryogenic Liquid Jets for High Repetition Rate Discovery Science
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A warm jet in a cold ocean.

Jennifer A MacKinnon1, Harper L Simmons2, John Hargrove3

  • 1Scripps Institution of Oceanography, University of California San Diego, San Diego, CA, USA. jmackinnon@ucsd.edu.

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Warm Pacific water entering the Arctic Ocean is subducting, accelerating sea ice melt. Understanding these small-scale processes is crucial for Arctic ecosystem and climate change predictions.

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Area of Science:

  • Oceanography
  • Arctic Climate Science
  • Sea Ice Dynamics

Background:

  • The Pacific sector of the Arctic Ocean is experiencing unprecedented heat influx via the Bering Strait, especially in summer.
  • A significant portion of this warm, salty Pacific water subducts beneath cooler, fresher surface layers, extending into the Beaufort Gyre.
  • This process introduces heat and unique biogeochemical properties, impacting the Arctic ecosystem and accelerating sea ice melt.

Purpose of the Study:

  • To investigate the physical processes controlling the subduction and evolution of warm Pacific-origin water in the Arctic.
  • To improve understanding of small-scale oceanographic phenomena that are not resolved by current climate models.
  • To provide new parameterizations for accurately representing these physics in regional forecast and climate simulations.

Main Methods:

  • High-resolution observational data collection.
  • Detailed analysis of subduction processes.
  • Tracking the initial evolution of warm Pacific water masses.

Main Results:

  • Novel observations reveal the detailed process of warm Pacific-origin water subduction in the southern Beaufort Gyre.
  • The study elucidates the initial evolution of these sub-surface warm water pockets.
  • Findings highlight the importance of small-scale physics in the larger Arctic system.

Conclusions:

  • Subduction of warm Pacific water is a key process influencing Arctic sea ice melt and ecosystem changes.
  • Current regional forecast models and climate simulations lack the resolution to capture these critical small-scale dynamics.
  • Accurate parameterizations based on high-resolution observations are necessary for improving Arctic climate predictions.