Ozone Trends in the Upper Troposphere‐Lower Stratosphere Using Equivalent Latitude‐Potential Temperature Coordinates

Abstract We analyze ozone trends in the upper troposphere and lower stratosphere (UTLS, 300–50 hPa), using geographical (latitude‐pressure and latitude‐altitude) and, for the first time, dynamical (equivalent latitude‐potential temperature, EqL‐) coordinates. Trends are determined using linear least squares fits, multiple linear regression, and dynamical linear modeling. Regardless of the method, EqL‐ improves consistency between trends across the UTLS, reduces large UT tropical uncertainties, alters the magnitude of mid‐latitude trends, and, most notably, in the Southern polar lower stratosphere, reveals statistically significant trends exceeding 8% per decade during Antarctic Spring. This provides further evidence of Antarctic ozone recovery. These robust trends are not captured using geographical coordinates. We argue that EqL‐ enables more physically grounded interpretations of chemical ozone trends and their uncertainties, as EqL‐ accounts for the adiabatic (reversible) transport of ozone.

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Publication Details

Journal
Geophysical Research Letters
Published
2025-11-16
DOI
https://doi.org/10.1029/2025gl118651
Primary Topic
Atmospheric Ozone and Climate
Type
article
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article

Ozone Trends in the Upper Troposphere‐Lower Stratosphere Using Equivalent Latitude‐Potential Temperature Coordinates

Franziska Weyland, Luis Millán, Irina V. Petropavlovskikh, H. Ye et al.
Geophysical Research Letters
Atmospheric Ozone and Climate
article

Ozone Trends in the Upper Troposphere‐Lower Stratosphere Using Equivalent Latitude‐Potential Temperature Coordinates

Franziska Weyland, Luis Millán, Irina V. Petropavlovskikh, H. Ye, Michaela I. Hegglin, Paul S. Jeffery, Peter Hoor, Daniel Kunkel, Harald Bönisch, Kaley A. Walker, Terry LeBlanc, G. L. Manney
article en

Abstract

Abstract We analyze ozone trends in the upper troposphere and lower stratosphere (UTLS, 300–50 hPa), using geographical (latitude‐pressure and latitude‐altitude) and, for the first time, dynamical (equivalent latitude‐potential temperature, EqL‐) coordinates. Trends are determined using linear least squares fits, multiple linear regression, and dynamical linear modeling. Regardless of the method, EqL‐ improves consistency between trends across the UTLS, reduces large UT tropical uncertainties, alters the magnitude of mid‐latitude trends, and, most notably, in the Southern polar lower stratosphere, reveals statistically significant trends exceeding 8% per decade during Antarctic Spring. This provides further evidence of Antarctic ozone recovery. These robust trends are not captured using geographical coordinates. We argue that EqL‐ enables more physically grounded interpretations of chemical ozone trends and their uncertainties, as EqL‐ accounts for the adiabatic (reversible) transport of ozone.

Geophysical Research LettersVol. 52(22)
Karlsruhe Institute of Technology (DE), Jet Propulsion Laboratory (US), Cooperative Institute for Research in Environmental Sciences (US), University of Wuppertal (DE), Forschungszentrum Jülich (DE), University of Toronto (CA), Johannes Gutenberg University Mainz (DE), New Mexico Institute of Mining and Technology (US), Northwest Research Associates (US), University of Reading (GB)
Openalex Percentile: Top 59%
Atmospheric Ozone and Climate
DOIOpen Access PDFOpenAlex
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