Atmospheric Ozone and Climate

Study reveals tropical isoprene varies by region: Amazonia emission-controlled, Maritime Continent chemistry-controlled, and equatorial Africa intermediate, requiring region-specific atmospheric.

Atmospheric methane growth peaked in 2020 driven by declining hydroxyl radicals and increased tropical wetland emissions in Africa and Asia, before declining through 2023.

Study models how expanded rocket launches could impact stratospheric ozone recovery, finding that 10-52 fold increases in chlorine emissions would cause modest but measurable ozone depletion.

21-year satellite inventory shows global atmospheric chlorine declining since 2004, though emerging short-lived substances offset some gains from CFC phase-out regulations.

Evaluation of UKESM1.1 against ATom aircraft data reveals missing marine aerosol formation pathways involving iodine, amines, and organic vapours in remote regions.

Controlled chamber study of PFAS aerosol formation reveals size-dependent inhalation deposition patterns. Most PFAS show fine-mode aerosols with peaks at 0.3 micrometers, while bacterial seed.

Entropy-based analysis of aerosol mixing state and CCN activity reveals distinct seasonal and geographic patterns, with heightened sensitivity in externally-mixed regimes at inland and coastal sites.

Computational kinetic study of OH radical reactions with gamma-heptalactone, establishing reaction mechanisms, rate coefficients, and product formation pathways relevant to atmospheric chemistry.

Study quantifies how free-tropospheric Saharan dust over the North Atlantic modulates low-level cloud cover via longwave-induced cloud-top warming that counteracts shortwave-driven cloud enhancement.