| Abstract : | In my talk, I shall present selected research highlights acquired using the IISER Mohali Atmospheric Chemistry Facility that houses India’s first PTR-MS and self-built OH reactivity device. The focus will be on recent methods developed and applied by our group for quantitative source apportionment based on chemical fingerprinting of sources, development of emission inventories for use in chemical transport models on a collaborative basis as well as the discovery of surprisingly high ambient concentrations of nitrogen-containing organics and a new terrestrial source that emits dimethyl sulphide. Additionally, findings from field intensives carried out by my group in Delhi and Kathmandu will also be shared. I shall also discuss how emissions from post-harvest agricultural crop residue fires in the northwest Indo Gangetic Plain (N.W. IGP), perturb ozone formation chemistry, and ambient hydroxyl radical reactivity through the photochemical formation of rarely measured nitrogen-containing organic compounds in summer and emission of toxic aromatic compounds in the post-monsoon season. The chemical mechanisms responsible for the formation of such compounds in the ambient air will be presented along with suggestions to constrain the atmospheric chemistry perturbations in atmospheric chemistry models more realistically in such biomass fire impacted atmospheric environments globally. Finally, the missing feedback from cropland trees that are required for accurate model simulations of land-atmosphere heat fluxes, temperature, boundary layer height, and ozone will be emphasized.
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