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New particle formation (NPF) has been investigated intensively during thelast 2 decades because of its influence on aerosol population and thepossible contribution to cloud condensation nuclei. However, intensivemeasurements and modelling activities on this topic in urban metropolitanareas in China with frequent high-pollution episodes are still very limited.This study provides results from a comprehensive modelling study on theoccurrence of NPF events in the western part of the Yangtze River Delta (YRD)region, China. The comprehensive modelling system, which combines theWRF-Chem (the Weather Research and Forecasting model coupled with Chemistry)regional chemical transport model and the MALTE-BOX sectional box model (themodel to predict new aerosol formation in the lower troposphere), was shownto be capable of simulating atmospheric nucleation and subsequent growth.Here we present a detailed discussion of three typical NPF days, during whichthe measured air masses were notably influenced by either anthropogenicactivities, biogenic emissions, or mixed ocean and continental sources.Overall, simulated NPF events were generally in good agreement with thecorresponding measurements, enabling us to get further insights into NPFprocesses in the YRD region. Based on the simulations, we conclude thatbiogenic organic compounds, particularly monoterpenes, play an essential rolein the initial condensational growth of newly formed clusters through theirlow-volatility oxidation products. Although some uncertainties remain in thismodelling system, this method provides a possibility to better understandparticle formation and growth processes

Comprehensive modelling study on observed new particle formation at the SORPES station in Nanjing, China