Preprints
https://doi.org/10.5194/egusphere-2024-1178
https://doi.org/10.5194/egusphere-2024-1178
03 May 2024
 | 03 May 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Examining ENSO related variability in tropical tropospheric ozone in the RAQMS-Aura chemical reanalysis

Maggie Bruckner, R. Bradley Pierce, and Allen Lenzen

Abstract. The El Niño-Southern Oscillation (ENSO) is a major driver of interannual variability in both tropical and mid-latitudes and has been found to have a strong impact on the distribution of tropospheric ozone in the tropical Pacific in satellite observational datasets, chemical transport models, and chemistry-climate simulations. Here we analyze interannual variability in tropical tropospheric ozone by applying composite analysis, empirical orthogonal function (EOF) analysis and multiple linear regression to the Real-time Air Quality Modeling System (RAQMS) Aura chemical reanalysis. As shown in similar studies, the dominant mode of interannual variability in tropical tropospheric ozone is driven by ENSO. ENSO composites show that the ENSO signature in tropospheric ozone is strongest near the tropopause. We also show an enhancement in tropical ozone over the maritime continent below 700 hPa during El Niño that is dependent on the magnitude of the biomass burning emissions in the region. We reconstruct the ENSO variability in tropical tropospheric ozone through a multiple linear regression of principal components for precipitation and CO. The multiple linear regression quantifies that variability in biomass burning contributes to ENSO variability in tropical tropospheric ozone though the dominant driver is convection.

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Maggie Bruckner, R. Bradley Pierce, and Allen Lenzen

Status: open (until 14 Jun 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-1178', Anonymous Referee #1, 17 May 2024 reply
Maggie Bruckner, R. Bradley Pierce, and Allen Lenzen
Maggie Bruckner, R. Bradley Pierce, and Allen Lenzen

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Short summary
We analyze interannual variability in tropical tropospheric ozone by applying composite analysis, empirical orthogonal function (EOF) analysis and multiple linear regression to the Real-time Air Quality Modeling System (RAQMS) Aura chemical reanalysis. We find that variability in biomass burning emissions contributes to ENSO variability in tropical tropospheric ozone though the dominant driver is convection.