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Open research questions in Atmospheric aerosols and clouds

686 gap statements mined from Atmospheric aerosols and clouds papers in our 7.9M-paper local library, which holds 3,005 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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What the literature leaves open

  • This study addresses key knowledge gaps in understanding the vertical structure of advected stratus in the Central Namib. Using ceilometer observations, it provides a comprehensive analysis of the patterns and variability of the fog/stratus base altitude at coastal and inland locations in the Central Namib Desert, and a verified approach to estimate CBH from near-surface relative humidity measurements.

    Cloud base height determines fog occurrence patterns in the Namib Desert · 2026 · DOI

  • Previous studies evaluating clouds over the GrIS in global models using CloudSat and CALIPSO data have reported contradictory results regarding ice and liquid cloud representation.

    Exploring new EarthCARE observations for evaluating Greenland clouds in the regional climate model RACMO2.4 · 2026 · DOI

  • A limitation of this study is that the current remote sensing capabilities at the NSA site do not provide vertical distribution of aerosols, which hinders the investigation of marine aerosol effects on LWP and IWP in conjunction to SIC changes.

    Western Arctic wintertime mixed-phase clouds: Observed modulation by sea ice conditions, long-term variabilities and trends · 2026 · DOI

  • As limitations of this study, we highlight the fact that the evaluation was conducted on only one AERONET station located in a tropical environment with strong climatic seasonality and AOD variability.

    Gap filling in long-term AOD time series using Iterative Singular Spectrum Analysis at a tropical AERONET site · 2026 · DOI

  • Most importantly, the effect on cloud microphysics from enhanced TO should be investigated. These results differ from recent aircraft studies, which reported larger HLD concentrations and used a different sampling period and INA analysis method yet they remain consistent with the broader evidence of conflicting results for volcanic HLD’s INA.

    Carbonaceous Aerosols and Ice Nucleation Activity in Iceland Environmental Samples · 2025 · DOI

  • In principle, the method could also be applied to the current satellite measurements (such as those of IASI) that are limited to the mid-infrared region.

    A new approach to crystal habit retrieval from far-infrared spectral radiance measurements · 2024 · DOI

  • These efforts have partially addressed the gaps in understanding surface LSRs in the UV and at non-nadir angles by Aeolus, thereby deepening the existing understanding provided by the CALIPSO studies mentioned above.

    Aeolus lidar surface return (LSR) at 355 nm as a new Aeolus Level-2A product · 2024 · DOI

  • However, the comparison is limited to the reported AOD magnitude and does not imply equivalence between the two events.

    Dust Event Characteristics, Transport Pathways, and Source Regions over Riyadh Using AERONET, HYSPLIT, and Surface Observations (2024–2025) · 2026 · DOI

  • The temperature-salinity effects on seawater refractive index, particularly for SWIR bands, remain to be assessed in future work.

    Error Budget Analysis of a Sun Glint Based In-Flight Polarization Calibration Method from Blue to SWIR Spectral Bands · 2026 · DOI

  • Also, while dust deposition fluxes are estimated in this work in connection to dust ecosystem impacts, the feedback of mineral-dependent dust deposition on ecosystems remains to be incorporated into future modeling works.

    Interconnected soil properties modulate compound hurricane-dust events that impact the Americas · 2026 · DOI

  • The complexity of aerosol compositions in the Indo-Gangetic Plain is not well understood. There is a need to identify dominant aerosol types and their seasonal variability. The study aims to address this gap by using a Gaussian Mixture Model.

    Identification of columnar aerosol types and seasonal disparity over urban sites in the Indo-Gangetic Plain using a Gaussian Mixture Model · 2026 · DOI

  • The present sampling verification is limited to a short quasi-two-dimensional setup.

    A Lagrangian particle tracking framework for the super-droplet method in SCALE-SDM 5.2.6-2.3.1: implementation and computational evaluation · 2026 · DOI

  • Closed-to-open cell mixed-phase cloud transitions within marine cold air outbreaks remain poorly understood despite their importance to high-latitude climate.

    A closed-to-open cell mixed-phase cloud transition observed over the Nordic Seas under high aerosol loading and strong surface fluxes · 2026 · DOI

  • The record-breaking 2023 Canadian wildfires attracted considerable attention; however, the bidirectional feedbacks between wildfires and meteorology remain unclear.

    Interactions among smoke, radiation, and meteorology in the Canadian wildfires · 2026 · DOI

  • In future, inclusion of more INPs to simulate cirrus clouds could clear uncertainties that were not explored in this study.

    Prior heterogeneous ice nucleation events shape homogeneous freezing during the evolution of synoptic cirrus · 2025 · DOI

  • Whether this climate-state dependence is reversible under aerosol reductions remains unresolved and warrants further investigation using aerosol reduction experiments under different background warming levels.

    Contrasting impacts of Asian sulfate aerosols on regional summer extreme precipitation under different climate backgrounds · 2026 · DOI

  • Further extension of the mission beyond September 2026 requires approval via a NASA senior review in early 2026, indicating uncertainty in long-term operational continuity.

    A New Era of Air Quality Monitoring from Space over North America with TEMPO:Mission Status from Early Years in Orbit · 2026 · DOI

  • The relatively coarse spatial resolution of hyperspectral geostationary sensors limits their ability to resolve fine-scale spatial heterogeneity in air pollution. The trade-off between spectral fidelity and spatial resolution remains a fundamental limitation of single-sensor satellite-based air quality monitoring.

    Deep learning-based super-resolution of GEMS hyperspectral data using GOCI-II fusion: Advancing high-resolution air quality monitoring · 2026 · DOI

  • There is a pressing need to quantitatively resolve the complex process of aerosol-cloud-precipitation interaction. Significant uncertainties remain regarding the modulating role of dust aerosols within the aerosol-cloud-precipitation interaction system.

    Response of extreme precipitation to dust aerosols in the Tarim Basin over the past 50 years · 2026 · DOI

  • There is a need to assess the spatiotemporal evolution of dust emissions, deposition, and associated radiative effects in Central Asia. There is a need to project future trends based on multiple scenarios. There is a need to evaluate the impact of climate policy on dust emissions.

    Assessment and prediction of dust emissions, deposition and radiation forcing in Central Asia · 2026 · DOI

  • By removing the influence of TCC and combining PLSR and RF models, the contributions and mechanisms of aerosol/precursors to SSR variations were quantified under both linear and nonlinear frameworks. The key findings are as follows: At the national scale, both the original and cloud cover-adjusted SSR series exhibit a ‘‘dimming-brightening’’ reversal trend over the past half-century, analogous to the global scale.

    Evolution and drivers of surface solar radiation over China since the mid-twentieth century · 2026 · DOI

  • The study validates against original GEMS L1C data, but the practical implementation and robustness of the fusion approach across different seasons and atmospheric aerosol loading scenarios needs additional exploration.

    Deep learning-based super-resolution of GEMS hyperspectral data using GOCI-II fusion: Advancing high-resolution air quality monitoring · 2026 · DOI

  • Investigation of aerosol ageing processes, - Study of aerosol transport pathways across South and East…

    Identification of columnar aerosol types and seasonal disparity over urban sites in the Indo-Gangetic Plain using a Gaussian Mixture Model · 2026 · DOI

  • Its 1° × 1° resolution allows better alignment with other gridded datasets, facilitating further studies on driving factors, precipitation efficiency, and radiative effects (shortwave and longwave).

    A global classification dataset of daytime and nighttime marine low-cloud mesoscale morphology based on deep-learning methods · 2025 · DOI

  • An open question is whether the onset of incoming radiation at sunrise also…

    EarthCARE reveals details on the role of rain in closed-to-open cell transitions · 2026 · DOI

Most-cited papers in Atmospheric aerosols and clouds

Most recent work

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Open questions raised by papers listed on this page include: (1) The temperature-salinity effects on seawater refractive index, particularly for SWIR bands, remain to be assessed in future work (“Error Budget Analysis of a Sun Glint Based In-Flight Polarization Calibration…”, 2026); (2) The complexity of aerosol compositions in the Indo-Gangetic Plain is not well understood (“Identification of columnar aerosol types and seasonal disparity over urban…”, 2026); (3) Closed-to-open cell mixed-phase cloud transitions within marine cold air outbreaks remain poorly understood despite their importance to high-latitude climate (“A closed-to-open cell mixed-phase cloud transition observed over the Nordic…”, 2026); (4) The record-breaking 2023 Canadian wildfires attracted considerable attention; however, the bidirectional feedbacks between wildfires and meteorology remain unclear (“Interactions among smoke, radiation, and meteorology in the Canadian wildfires”, 2026); (5) Whether this climate-state dependence is reversible under aerosol reductions remains unresolved and warrants further investigation using aerosol reduction experiments under different background warming levels (“Contrasting impacts of Asian sulfate aerosols on regional summer extreme…”, 2026). 686 gap statements have been mined from Atmospheric aerosols and clouds papers in our 7.9M-paper local library, which holds 3,005 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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