The hydroxyl radical, OH, initiates the removal of the majority of trace gases in the
atmosphere, and together with the closely coupled species, the hydroperoxy radical, HO2, is …

The Amazon Basin plays key roles in the carbon and water cycles, climate change,
atmospheric chemistry, and biodiversity. It has already been changed significantly by human …

Particulate nitrate (pNO 3−) has long been considered a permanent sink for NO x (NO and
NO2), removing a gaseous pollutant that is central to air quality and that influences the …

Ozone holds a certain fascination in atmospheric science. It is ubiquitous in the atmosphere,
central to tropospheric oxidation chemistry, yet harmful to human and ecosystem health as …

We present a simulation of the global present-day composition of the troposphere which
includes the chemistry of halogens (Cl, Br, I). Building on previous work within the GEOS …

Long-term monitoring of data of ambient mercury (Hg) on a global scale to assess its
emission, transport, atmospheric chemistry, and deposition processes is vital to …

Is wind direction an adequate marker of air mass history? This review looks at the evolution
of methods for assessing the effect of the origin and pathway of air masses on composition …

Volcanic eruptions can cause significant disruption to society, and numerical models are
crucial for forecasting the dispersion of erupted material. Here we assess the skill and …

We present a global simulation of tropospheric iodine chemistry within the GEOS-Chem
chemical transport model. This includes organic and inorganic iodine sources, standard gas …

Desert dust is increasingly recognized as a major air pollutant affecting respiratory health.
Since desert dust exposure cannot be regulated, the hazardousness of its components must …