Preprints
https://doi.org/10.5194/egusphere-2024-318
https://doi.org/10.5194/egusphere-2024-318
20 Feb 2024
 | 20 Feb 2024

A new characterization of the North Atlantic eddy-driven jet using 2-dimensional moment analysis

Jacob Perez, Amanda Maycock, Stephen Griffiths, Steven Hardiman, and Christine McKenna

Abstract. We develop a novel technique for characterising the latitude, tilt and intensity of the North Atlantic eddy-driven jet using a feature identification method and two-dimensional moment analysis. Applying this technique to the ERA5 reanalysis, the distribution of daily winter jet latitude is unimodal with a mean of 46° N and a negative skew of -0.07. This is in contrast with the trimodal distribution of the daily Jet Latitude Index (JLI) . We show that our method exhibits less noise than the JLI, casting doubt on the previous interpretations of the trimodal distribution as evidence for regime behaviour of the North Atlantic jet. It also explicitly and straightforwardly handles days where the jet is split. Though climatologically the jet is tilted south-west to north-east, around a fifth of winter days show an opposite tilted jet. Our method is simple, requiring only daily 850 hPa zonal wind data, and diagnoses the jet in a more informative and robust way than previous methods.

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Jacob Perez, Amanda Maycock, Stephen Griffiths, Steven Hardiman, and Christine McKenna

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2024-318', Kristian Strommen, 20 Feb 2024
  • RC1: 'Comment on egusphere-2024-318', Clemens Spensberger, 19 Mar 2024
    • AC1: 'Reply on RC1', Jacob Perez, 10 May 2024
  • RC2: 'Comment on egusphere-2024-318', Anonymous Referee #2, 27 Mar 2024
    • AC2: 'Reply on RC2', Jacob Perez, 10 May 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2024-318', Kristian Strommen, 20 Feb 2024
  • RC1: 'Comment on egusphere-2024-318', Clemens Spensberger, 19 Mar 2024
    • AC1: 'Reply on RC1', Jacob Perez, 10 May 2024
  • RC2: 'Comment on egusphere-2024-318', Anonymous Referee #2, 27 Mar 2024
    • AC2: 'Reply on RC2', Jacob Perez, 10 May 2024
Jacob Perez, Amanda Maycock, Stephen Griffiths, Steven Hardiman, and Christine McKenna
Jacob Perez, Amanda Maycock, Stephen Griffiths, Steven Hardiman, and Christine McKenna

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Short summary
This study assesses existing methods for identifying the position and tilt of the North Atlantic eddy-driven jet, proposing a new feature-based approach. The new method overcomes limitations of other methods, offering a more robust characterization. Contrary to prior findings, the distribution of daily latitudes shows no distinct multi-modal structure, challenging the notion of preferred jet stream latitudes or regimes. This research enhances our understanding of North Atlantic dynamics.