Ozone Transport‐Radiation Feedbacks in the Tropical Tropopause Layer

Charlesworth, Edward; Birner, Thomas; Albers, John R.

doi:10.1029/2019gl084679

Cited by 9 publications

(12 citation statements)

References 34 publications

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“…9b-c) time scales, enhancing confidence in a simple understanding. We note that the frequency-dependent O3-T behavior shown here is consistent with the results of Charlesworth et al (2019), which indicate larger ozone radiative impacts on tropopause temperatures for low frequencies. 350…”

Section: Summary and Discussionsupporting

confidence: 89%

“…Our goal is to explain the salient features of ozone-temperature (O3-T) coupling from observations in a relatively simple framework, including the frequency and altitude dependences of the (O3/T) amplitude and phase relationships. These results are a complement to the recent analyses of 50 Birner and Charlesworth (2017) and Charlesworth et al (2019), based on a very different model.…”

Section: Introductionsupporting

confidence: 67%

“…Birner and Charlesworth (2017) and Dacie et al (2019) have demonstrated strong sensitivity of tropical stratospheric temperatures to ozone using idealized onedimensional model calculations, following the earlier results of Thuburn and Craig (2002). Charlesworth et al (2019) extended that work to study transient ozone-temperature feedbacks, highlighting larger effects for low frequency variations 35 (periods longer than about half a year).…”

Section: Introductionmentioning

confidence: 59%

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A simple model of ozone-temperature coupling in the tropical lower stratosphere

Randel

Ming

et al. 2021

Preprint

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Abstract. Observations show strong correlations between large-scale ozone and temperature variations in the tropical lower stratosphere across a wide range of time scales. We quantify this behavior using monthly records of ozone and temperature data from SHADOZ tropical balloon measurements (1998–2016), along with global satellite data from Aura MLS and GPS radio occultation over 2004–2018. The observational data demonstrate strong in-phase ozone-temperature coherence spanning sub-seasonal, annual and interannual time scales, and the slope of the ozone-temperature relationship (O3/T) varies as a function of time scale 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 (O3/T) amplitude and phase relationships, including sensitivity to time scale and altitude, and highlight distinct balances for ‘fast’ variations (periods < 150 days, controlled by transport across background vertical gradients) and ‘slow’ coupling (seasonal and interannual variations, controlled by radiative balances).

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Section: Summary and Discussionsupporting

confidence: 89%

Section: Introductionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 59%

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A simple model of ozone-temperature coupling in the tropical lower stratosphere

Randel

Ming

et al. 2021

Preprint

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“…Previous studies have suggested that dynamical feedbacks other than the ozone-radiation feedback highlighted here may affect tropical stratospheric temperature variability. For example, changes in the stratification of the atmosphere affect vertical motion and its influence on adiabatic temperature change (Birner and Charlesworth 2017;Fueglistaler et al 2011), and variations in the dynamical and radiative time scales affect stratospheric temperature variance (Charlesworth et al 2019). Importantly, the differences in stratospheric temperature variance revealed here do not seem to derive from changes in the variance of stratospheric dynamics, that is, the variance of the temperature tendency due to vertical motion (vS) is roughly unchanged in the tropical stratosphere between the FR and SC-WACCM simulations (not shown).…”

Section: Discussionmentioning

confidence: 99%

The Key Role of Coupled Chemistry–Climate Interactions in Tropical Stratospheric Temperature Variability

et al. 2020

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The purpose of this study is to quantify the effects of coupled chemistry–climate interactions on the amplitude and structure of stratospheric temperature variability. To do so, the authors examine two simulations run on version 4 of the Whole Atmosphere Coupled Climate Model (WACCM): a “free-running” simulation that includes fully coupled chemistry–climate interactions and a “specified chemistry” version of the model forced with prescribed climatological-mean chemical composition. The results indicate that the inclusion of coupled chemistry–climate interactions increases the internal variability of temperature by a factor of ~2 in the lower tropical stratosphere and—to a lesser extent—in the Southern Hemisphere polar stratosphere. The increased temperature variability in the lower tropical stratosphere is associated with dynamically driven ozone–temperature feedbacks that are only included in the coupled chemistry simulation. The results highlight the fundamental role of two-way feedbacks between the atmospheric circulation and chemistry in driving climate variability in the lower stratosphere.

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“…These species induce local and non‐local changes to the radiative balance. Several studies have focused on this interaction in the tropical lower stratosphere, in the time mean and for the seasonal cycle (Charlesworth et al., 2019; Forster et al., 1997; Ming et al., 2017). These studies make use of single column radiative calculations, typically assuming that the dynamical heating is fixed, and have proved to be instrumental in understanding the contribution of radiative transfer to temperature variability in this region.…”

Section: Introductionmentioning

confidence: 99%

What Contributes to the Inter‐Annual Variability in Tropical Lower Stratospheric Temperatures?

Ming

Hitchcock

2021

JGR Atmospheres

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The inter-annual variability of temperatures in the tropical lower stratosphere is of interest since temperature in this region controls the entry of water vapor into the stratosphere which can then modify the surface radiative balance (Fueglistaler et al., 2014). The chemical composition of the stratosphere is strongly impacted by the balance reached between the circulation, radiation and chemistry in this region. A number of trace species including ozone, water vapor, and stratospheric aerosols in this region have significant climate impacts. Temperatures in the tropical lower stratosphere are closely coupled to these trace species and thus to their influence on the energy balance of the climate system. Despite their importance, temperatures in this region exhibit more uncertainty in reanalysis datasets than in any other region in the atmosphere below 10 hPa (see Hersbach et al., 2020, their Figure 11). A detailed understanding of the processes that determine temperatures in this region is thus desirable.The inter-annual variability in dynamical heating arising from changes in upwelling in the Brewer-Dobson circulation has been identified as a main contributor to this temperature variability (Fueglistaler et al., 2014). An increase in upwelling decreases temperature below radiative equilibrium by adiabatic cooling. It also changes the transport of ozone, water vapor and aerosol-all radiatively active trace species. These species induce local and

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Ozone Transport‐Radiation Feedbacks in the Tropical Tropopause Layer

Cited by 9 publications

References 34 publications

A simple model of ozone-temperature coupling in the tropical lower stratosphere

A simple model of ozone-temperature coupling in the tropical lower stratosphere

The Key Role of Coupled Chemistry–Climate Interactions in Tropical Stratospheric Temperature Variability

What Contributes to the Inter‐Annual Variability in Tropical Lower Stratospheric Temperatures?

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