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Open research questions in Atmospheric Ozone and Climate

291 gap statements mined from Atmospheric Ozone and Climate papers in our 7.9M-paper local library, which holds 1,133 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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  • When the cloud optical depth is larger than 3 × 10−2, its relative uncertainty is smaller than 5 %. For very thin clouds this uncertainty can be as high as 90 %. Moreover on should also consider the uncertainty attached to choice of the lidar ratio when the retrieval of the lidar data is not constrained.

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

  • In the context of this research, future work should explore stratosphere –troposphere interactions particularly driven by the decline of Arctic sea ice, which reached a record-low seasonal maximum on 22 March 2025 (National Snow and Ice Data Center Reports, 2025) and ongoing stratospheric cooling from rising greenhouse gases.

    Troposphere–Stratosphere–Mesosphere Coupling and Ozone Response to Arctic Stratospheric Variability during the 2024/25 Winter Season · 2026 · DOI

  • The major limitations of this study are the following: (i) The CloudSat and CALIPSO observations made at 1:30 AM/1:30 PM underestimate the CPT-crossing clouds over the Amazon region and Central Africa, where the peak convection occurs in the evening.

    Tropical clouds near and overshooting the cold point tropopause: effect of the Hadley and Walker circulations observed using CloudSat and CALIPSO · 2026 · DOI

  • Given the importance of accurate simulation of oxidised N for many processes important to the climate, air quality, and wider environment, further investigation of these discrepancies in simulated NO2 in UKCA is required.

    Evaluating tropospheric nitrogen dioxide in UKCA using OMI satellite retrievals over south and east Asia · 2025 · DOI

  • However, the mechanism of SI effects on the atmospheric environment with the cross-layer transport of O3 from the stratosphere through the free troposphere to the atmospheric boundary layer has not been elucidated thoroughly.

    A mechanism of stratospheric O 3 intrusion into the atmospheric environment: a case study of the North China Plain · 2024 · DOI

  • Lessons learned Development of the retrieval method highlighted a number of features of the MT-DOAS retrieval of BrO: – The placement of the MT-DOAS above most atmospheric aerosol meant that aerosol at and above the instrument altitude were minimal to almost negligible; however, it also revealed the need to represent aerosol and cloud radiative effects below the instrument.

    Troposphere–stratosphere-integrated bromine monoxide (BrO) profile retrieval over the central Pacific Ocean · 2024 · DOI

  • However, little research has been performed on δ13CO2 in the stratosphere, and the mechanisms of its distribution and variations are not fully understood.

    Stratospheric δ 13 CO 2 observed over Japan and its governing processes · 2025 · DOI

  • However, whether the eruption could lead to surface climate changes via other, more indirect pathways remains not well understood.

    Indirect climate impacts of the Hunga eruption · 2026 · DOI

  • The ecological and evolutionary significance of this Antarctic-specific deletion warrants investigation.

    Transcontinental Spread of HPAI H5N1 from South America to Antarctica via Avian Vectors · 2025 · 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

  • 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

  • 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

  • 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

  • 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

  • However, the physical mechanisms responsible for this variability have been poorly investigated.

    Quasi-biennial oscillation modulation of stratospheric water vapour in the Asian monsoon · 2024 · 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

  • 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

  • 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 causes of these differences are not fully understood at this point but are at least partially attributable to algorithmic differences for SCDs, including algorithm settings…

    Version 1 NOAA-20/OMPS Nadir Mapper total column SO 2 product: continuation of NASA long-term global data record · 2024 · DOI

  • An important limitation comes from the use of reanalyzed winds to calculate all trajectories.

    Strateole 2 balloons reveal persistent errors in reanalyzed winds and trajectory calculations in the tropical lower stratosphere · 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

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Open questions raised by papers listed on this page include: (1) Whether the eruption could lead to surface climate changes via other, more indirect pathways remains not well understood (“Indirect climate impacts of the Hunga eruption”, 2026); (2) 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); (3) Further study is needed to investigate the causes of individual peaks of strongly enhanced upwelling in the lower stratosphere (“Tropical stratospheric upwelling as seen in observations of the tape recorder…”, 2026); (4) 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…”, 2026); (5) Little research has been performed on δ13CO2 in the stratosphere, and the mechanisms of its distribution and variations are not fully understood (“Stratospheric δ 13 CO 2 observed over Japan and its governing processes”, 2025). 291 gap statements have been mined from Atmospheric Ozone and Climate papers in our 7.9M-paper local library, which holds 1,133 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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