A simple model of ozone–temperature coupling in the tropical lower stratosphere
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Published:2021-12-21
Issue:24
Volume:21
Page:18531-18542
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Randel William J.ORCID, Wu Fei, Ming AlisonORCID, Hitchcock PeterORCID
Abstract
Abstract. Observations show strong correlations between large-scale ozone
and temperature variations in the tropical lower stratosphere across a wide
range of timescales. We quantify this behavior using monthly records of
ozone and temperature data from Southern Hemisphere Additional Ozonesonde (SHADOZ) tropical balloon measurements
(1998–2016), along with global satellite data from Aura microwave limb sounder and GPS radio
occultation over 2004–2018. The observational data demonstrate strong
in-phase ozone–temperature coherence spanning sub-seasonal, annual and
interannual timescales, and the slope of the temperature–ozone relationship
(T / O3) varies as a function of timescale and altitude. We compare the
observations to idealized calculations based on the coupled zonal mean
thermodynamic and ozone continuity equations, including ozone radiative
feedbacks on temperature, where both temperature and ozone respond in a
coupled manner to variations in the tropical upwelling Brewer–Dobson
circulation. These calculations can approximately explain the observed
(T / O3) amplitude and phase relationships, including sensitivity to timescale and altitude, and highlight distinct balances for “fast” variations
(periods < 150 d, controlled by transport across background
vertical gradients) and “slow” coupling (seasonal and interannual
variations, controlled by radiative balances).
Funder
Earth Sciences Division
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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