GEOS-Chem Model

We use the GEOS-Chem global chemical transport model to simulate tropospheric chemistry, with a focus on tropospheric sulfur and reactive halogen chemistry. We also develop the sulfate oxygen isotope version of GEOS-Chem to investigate sulfate formation mechanisms in the atmosphere.

[Chen et al., 2018ACP; 2017GRL; 2016ACP]

Chemical Ionization Mass Spectrometry

We use chemical ionization mass spectrometry (CIMS) to measure reactive halogen and nitrogen species (e.g. ClNO₂, Cl₂, HOCl, N₂O₅, HONO) in laboratory experiments and in the field. The Atmospheric Research Lab at PolyU houses many beautiful instruments/equipments for determining the abundances of chemical species that are important for air quality and climate.

Isotope-ratio Mass Spectrometry

We collaborate with other groups to measure isotopic composition of sulfate aerosol and H₂ with isotope-ratio mass spectrometry. A GRF proposal was recently funded to collaborate with UW to measure oxygen isotopes of sulfate in aerosol samples collected in the field.

[Chen et al., 2016ACP; 2015ACP]