Preprints
https://doi.org/10.5194/egusphere-2024-144
https://doi.org/10.5194/egusphere-2024-144
12 Feb 2024
 | 12 Feb 2024

Exploring ozone variability in the upper troposphere and lower stratosphere using dynamical coordinates

Luis F. Millán, Peter Hoor, Michaela I. Hegglin, Gloria L. Manney, Harald Boenisch, Paul Jeffery, Daniel Kunkel, Irina Petropavlovskikh, Hao Ye, Thierry Leblanc, and Kaley Walker

Abstract. Ozone trends in the upper troposphere/lower stratosphere (UTLS) remain highly uncertain because of sharp spatial gradients and large variability caused by competing transport, chemical, and mixing processes near the upper tropospheric jets and extra-tropical tropopause, as well as inhomogeneous spatially and temporally limited observations of the region. Subtropical jets and the tropopause act as transport barriers, delineating boundaries between atmospheric regimes controlled by different processes; they can thus be used to separate data taken in those different regimes for numerous purposes, including trend assessment. As part of the Observed Composition Trends And Variability in the UTLS (OCTAV-UTLS) Stratosphere-troposphere Processes And their Role in Climate (SPARC) activity, we assess the effectiveness of several coordinate systems in segregating air into different atmospheric regimes. To achieve this, a comprehensive dynamical dataset is used to reference every measurement from various observing systems to the locations of jets and tropopauses in different coordinates (e.g., altitude, pressure, potential temperature, latitude, and equivalent latitude). We assess which coordinate combinations are most useful for dividing the measurements into bins such that the data in each bin is affected by the same processes, thus minimizing the variability induced when combining measurements from different dynamical regimes, each characterized by different physical processes. Such bins will be particularly suitable for combining measurements with different sampling characteristics and for assessing trends and attributing them to changing atmospheric dynamics.

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Luis F. Millán, Peter Hoor, Michaela I. Hegglin, Gloria L. Manney, Harald Boenisch, Paul Jeffery, Daniel Kunkel, Irina Petropavlovskikh, Hao Ye, Thierry Leblanc, and Kaley Walker

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-144', Anonymous Referee #1, 05 Mar 2024
    • AC2: 'Reply on RC1', Luis Millan, 17 Apr 2024
  • RC2: 'Comment on egusphere-2024-144', Juan Antonio Añel, 08 Mar 2024
    • AC1: 'Reply on RC2', Luis Millan, 17 Apr 2024
  • RC3: 'Comment on egusphere-2024-144', Anonymous Referee #3, 11 Mar 2024
    • AC4: 'Reply on RC3', Luis Millan, 17 Apr 2024
  • RC4: 'Comment on egusphere-2024-144', Anonymous Referee #4, 08 Apr 2024
    • AC3: 'Reply on RC4', Luis Millan, 17 Apr 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-144', Anonymous Referee #1, 05 Mar 2024
    • AC2: 'Reply on RC1', Luis Millan, 17 Apr 2024
  • RC2: 'Comment on egusphere-2024-144', Juan Antonio Añel, 08 Mar 2024
    • AC1: 'Reply on RC2', Luis Millan, 17 Apr 2024
  • RC3: 'Comment on egusphere-2024-144', Anonymous Referee #3, 11 Mar 2024
    • AC4: 'Reply on RC3', Luis Millan, 17 Apr 2024
  • RC4: 'Comment on egusphere-2024-144', Anonymous Referee #4, 08 Apr 2024
    • AC3: 'Reply on RC4', Luis Millan, 17 Apr 2024
Luis F. Millán, Peter Hoor, Michaela I. Hegglin, Gloria L. Manney, Harald Boenisch, Paul Jeffery, Daniel Kunkel, Irina Petropavlovskikh, Hao Ye, Thierry Leblanc, and Kaley Walker
Luis F. Millán, Peter Hoor, Michaela I. Hegglin, Gloria L. Manney, Harald Boenisch, Paul Jeffery, Daniel Kunkel, Irina Petropavlovskikh, Hao Ye, Thierry Leblanc, and Kaley Walker

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Short summary
As part of the Observed Composition Trends And Variability in the UTLS (OCTAV-UTLS) SPARC activity, we have mapped multi-platform ozone datasets into different coordinate systems to systematically evaluate the influence of these coordinates on binned climatological variability. This effort unifies the previously disparate work of numerous studies that focused on individual coordinate system variability. Our goal was to create the most comprehensive assessment of this topic.