Convective Transport of Trace Gases in Atmospheric Chemistry

Deep convection governs the vertical redistribution of minor atmospheric constituents by lifting air from the planetary boundary layer into the mid and upper troposphere. During convective ascent, surface-emitted trace gases – including nitrogen oxides, volatile organic compounds and aerosols – are rapidly transported to altitudes of 5–15 km, where they interact with enhanced ultraviolet radiation and altered temperature–humidity profiles. Detrainment of convective plumes injects these species into the freetropospheric flow, influencing regional ozone chemistry, oxidative capacity and long-range pollutant pathways. Convective transport thus links surface emissions, photochemical reaction networks and large-scale circulation, with implications for air quality, climate forcing and the interpretation of satellite retrievals. Accurate representation of updraft structure, entrainment–detrainment rates and the vertical distribution of convective sources (including lightning-produced NOx) is critical for global chemical models and for assessing the feedbacks between weather systems and atmospheric composition.

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Convective Transport of Trace Gases in Atmospheric Chemistry publication trend

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Technical terms

Convective transport: Vertical movement of air driven by buoyancy, carrying heat and chemical species upward.

Trace gases: Minor atmospheric constituents (e.g. ozone, NOx, VOCs) present at parts-per-billion to parts-per-million levels, critical to photochemistry.

Detrainment: The process by which air parcels leave a convective updraft and disperse into the surrounding troposphere.

Troposphere: The lowest layer of the atmosphere (surface to ~10–15 km) where most weather and convective activity occur.

Boundary layer: The lowest portion of the troposphere directly influenced by surface fluxes of heat, moisture and momentum.

References

1. Nitrogen oxides in the free troposphere: implications for tropospheric oxidants and the interpretation of satellite NO2 measurements. Atmospheric Chemistry and Physics (2023).
2. Lightning‐Produced Nitrogen Oxides Per Flash Length Obtained by Using TROPOMI Observations and the Ebro Lightning Mapping Array. Geophysical Research Letters (2023).
3. Thunderstorms and upper troposphere chemistry during the early stages of the 2006 North American Monsoon. Atmospheric Chemistry and Physics (2012).