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Open research questions in Atmospheric Ozone and Climate

132 unresolved questions extracted from the limitations and future-work sections of 356 Atmospheric Ozone and Climate papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The study relies on model experiments, - The QBO is not internally generated in some models, but nudged instead, - The study only considers a limited number of models and experiments, - The characterisation of aerosol size distributions plays a crucial role in the emergence of the spread in the modelled temperature response

    Assessing the stratospheric temperature response to volcanic sulfate injections by Mt. Pinatubo: insights from the Interactive Stratospheric Aerosol Model Intercomparison Project · 2026 · DOI

  • Further research is needed to understand the impacts of varying injection amounts and heights on stratospheric temperature anomalies, - Studies should consider a larger number of models and experiments, - Research should focus on improving the characterisation of aerosol size distributions, - More work is needed to understand the sensitivity of the stratospheric temperature response to model selection

    Assessing the stratospheric temperature response to volcanic sulfate injections by Mt. Pinatubo: insights from the Interactive Stratospheric Aerosol Model Intercomparison Project · 2026 · DOI

  • The variability of the stratospheric aerosol layer can affect the measurements, - Multiple scattering is negligible for optically thin clouds but the uncertainty on the lidar ratio could be quite large, - The system has a limited range and can only measure clouds below 20 km

    Measuring cloud optical depth with a balloonborne microlidar operated from the stratosphere · 2026 · DOI

  • Further investigation of the variability of the stratospheric aerosol layer, - Development of methods to reduce the uncertainty on the lidar ratio, - Expansion of the system's range to measure clouds at higher altitudes

    Measuring cloud optical depth with a balloonborne microlidar operated from the stratosphere · 2026 · DOI

  • In this paper we identify disagreements, omissions, and gaps in the literature on infrared (IR) intensities of methanol ices, including unaddressed concerns that reach back several decades.

    Infrared Spectroscopic and Physical Properties of Methanol Ices—Reconciling the Conflicting Published Band Strengths of an Important Interstellar Solid · 2024 · DOI

  • Considering the recently observed increase in Cl-VSLS emissions and the ongoing strengthening of the East Asian summer monsoon under global warming, our results highlight that a reevaluation of the contribution of Cl-VSLS injection via the Asian monsoon to the total stratospheric chlorine budget is warranted.

    East Asian summer monsoon delivers large abundances of very short-lived organic chlorine substances to the lower stratosphere · 2024 · DOI

  • The reasons for lower reactive nitrogen values observed during the 2024/2025 mission compared to the 2015/2016 POLSTRACC mission are not clarified and require deeper analysis.

    Redistribution of total reactive nitrogen in the lowermost Arctic stratosphere in late winter 2024/2025: Comparison with the findings during the cold winter 2015/2 · 2026 · DOI

  • The mechanisms underlying the alternation between elevated reactive nitrogen concentrations and lower-than-expected concentrations during the ASCCI campaign are not fully explained and warrant further investigation.

    Redistribution of total reactive nitrogen in the lowermost Arctic stratosphere in late winter 2024/2025: Comparison with the findings during the cold winter 2015/2 · 2026 · DOI

  • The information on mixing and transport is difficult to extract from observed or simulated mole fractions in the UTLS.

    The CO2 seasonal signal as a transport diagnostic in the UTLS · 2026 · DOI

  • Statistical analyses are needed to assess whether AirCore observations can be used to constrain the CO2 seasonality in the UTLS, indicating uncertainty about the observational constraint capability.

    The CO2 seasonal signal as a transport diagnostic in the UTLS · 2026 · DOI

  • Validation of the derived AMFs and SCDs was performed only against pseudo-spherical radiative transfer models and MAX-DOAS measurements at two Antarctic sites, suggesting limited geographic and instrumental scope.

    UV/Vis Stratospheric Air Mass Factors considering photochemistry at Marambio and Belgrano Antarctic stations · 2026 · DOI

  • A lack of direct observations of tropical upwelling. A spread in upwelling structure across the modern reanalysis. Noise and sparsity of observations in the SWOOSH record prior to Aura MLS.

    Tropical stratospheric upwelling as seen in observations of the tape recorder signal · 2026 · DOI

  • Further study is needed to investigate the causes of individual peaks of strongly enhanced upwelling in the lower stratosphere. The relationship between tropical upwelling and other stratospheric tracers should be further explored. The method should be applied to other datasets to verify the results.

    Tropical stratospheric upwelling as seen in observations of the tape recorder signal · 2026 · DOI

  • Future abundances of HFCs may have a larger impact on in-atmosphere HFC-23 production than future HFO emissions, requiring better understanding of how HFC phase-out under the Kigali Amendment will affect these processes.

    Further constraining the role of in-atmosphere production on the global HFC-23 budget · 2026 · DOI

  • The importance of understanding the atmospheric fate of HFO species cannot be understated, as their adoption without sufficient consideration of long-term impacts could echo previous unintended consequences from policy changes concerning fluorinated species.

    Further constraining the role of in-atmosphere production on the global HFC-23 budget · 2026 · DOI

  • Collecting whole air samples from the stratosphere is challenging due to the high altitude and limited access. Analyzing the samples using GC-MS requires specialized equipment and expertise. Estimating stratospheric lifetimes using observational data is complex due to the many factors that influence CFC concentrations.

    Observationally-derived Fractional Release Factors, Ozone Depletion Potentials, and Stratospheric Lifetimes of Four Long-Lived CFCs: CFC-13 (CClF 3 ), CFC-114 (C 2 Cl 2 F 4 ), CFC-114a (CF 3 CCl 2 F), and CFC-115 (C 2 ClF 5 ) · 2026 · DOI

  • The study only covered mid and high latitudes in the northern hemisphere. The analysis did not include uncertainties in tropospheric entry mixing ratios. The study used a limited number of samples from each campaign.

    Observationally-derived Fractional Release Factors, Ozone Depletion Potentials, and Stratospheric Lifetimes of Four Long-Lived CFCs: CFC-13 (CClF 3 ), CFC-114 (C 2 Cl 2 F 4 ), CFC-114a (CF 3 CCl 2 F), and CFC-115 (C 2 ClF 5 ) · 2026 · DOI

  • Further study of the variability of chemical heating rates in the UMLT region. Investigation of the impact of the diurnal tide on chemical and physical processes in the UMLT region. Development of improved models of the upper mesosphere-lower thermosphere region.

    A new data set of nighttime chemical heating rates in the upper mesosphere and lower thermosphere derived from SCIAMACHY OH (9–6) emissions and SABER profiles · 2026 · DOI

  • The quantification of chemical heating remains uncertain. There is a need for a new data set of chemical heating rates for the upper mesosphere-lower thermosphere region.

    A new data set of nighttime chemical heating rates in the upper mesosphere and lower thermosphere derived from SCIAMACHY OH (9–6) emissions and SABER profiles · 2026 · DOI

  • Accurate monitoring of tropospheric nitrogen dioxide is challenging. The WRF-Chem model and TROPOMI tropospheric NO2 columns have biases and uncertainties. The lack of ceilometer data prevents the diagnosis of potentially overestimated vertical mixing.

    Validation of TROPOMI and WRF-Chem NO 2 across seasons using SWING+ and surface observations over Bucharest · 2026 · DOI

  • The study is limited to the Bucharest area. The model is run at a relatively coarse resolution of 1 km. The lack of ceilometer data prevents the diagnosis of potentially overestimated vertical mixing.

    Validation of TROPOMI and WRF-Chem NO 2 across seasons using SWING+ and surface observations over Bucharest · 2026 · DOI

  • Future research should focus on improving the representation of stratospheric transport in CCMs. Future research should focus on evaluating the impact of the biases found in this study on ozone layer projections.

    Evaluation of stratospheric transport in three generations of Chemistry-Climate Models · 2026 · DOI

  • The study identifies a gap in the evaluation of stratospheric transport in CCMs. The study identifies a gap in the understanding of the Antarctic 'ozone hole' variability.

    Evaluation of stratospheric transport in three generations of Chemistry-Climate Models · 2026 · DOI

  • Understanding the QBO signal in water vapor is challenging due to its complex interactions with other climate variables. Simulating the QBO signal in water vapor is difficult due to its high variability. Observing the QBO signal in water vapor is limited by the availability of datasets.

    Seasonality of the Quasi-biennial Oscillation signal in water vapor in the tropical stratosphere · 2026 · DOI

  • The CMIP6 models tend to underestimate the water vapor amplitude, and the seasonal contrast is underrepresented in most models. The study uses a limited dataset, from 1959 to 2019 for ERA5 and 1992-2019 for SWOOSH.

    Seasonality of the Quasi-biennial Oscillation signal in water vapor in the tropical stratosphere · 2026 · DOI

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132 open questions have been extracted from the limitations and future-work passages of 356 Atmospheric Ozone and Climate papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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