«THE stable carbon isotopic (13C / 12C) record
of twentieth - century tree rings has been examined1 - 3 for evidence
of the
effects of the input
of isotopically
lighter fossil fuel CO2 (δ 13C ~ -25 ‰ relative to the
primary PDB standard4), since the onset
of major fossil fuel combustion during the mid-nineteenth century, on the 13C / 12C ratio
of atmospheric CO2 (δ 13C ~ -7 ‰), which is assimilated by trees by photosynthesis.
Topics that I work on or plan to work in the future include studies
of: + missing aerosol species and sources, such as the
primary oceanic aerosols and their importance on the remote marine atmosphere, the in - cloud and aerosol water aqueous formation
of organic aerosols that can lead to brown carbon formation, the
primary terrestrial biological particles, and the organic nitrogen + missing aerosol parameterizations, such as the
effect of aerosol mixing on cloud condensation nuclei and aerosol absorption, the semi-volatility
of primary organic aerosols, the importance
of in - canopy processes on natural terrestrial aerosol and aerosol precursor sources, and the mineral dust iron solubility and bioavailability + the change
of aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas - phase chemistry via photolysis rates changes and heterogeneous reactions in the atmosphere, as well as their
effect on key gas - phase species like ozone + the physical and optical properties
of aerosols, which affect aerosol transport, lifetime, and
light scattering and absorption, with the latter being very sensitive to the vertical distribution
of absorbing aerosols + aerosol - cloud interactions, which include cloud activation, the aerosol indirect
effect and the impact
of clouds on aerosol removal + changes on climate and feedbacks related with all these topics In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance
of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climate.