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Measurement report: Ice nucleating particles variability across a megacity
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DOI：10.5194/acp-26-8295-2026.png)
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Abstract
En 中文
Abstract. Megacities are a major source of urban aerosol particles; which can impact cloud formation and the local hydrological cycle. However; the aerosol-cloud interaction above megacities; especially in their different microclimates; is poorly understood. In the present study; the physicochemical and biological properties of urban aerosol particles; along with their ice nucleating particle (INP) concentration via immersion freezing and as a function of particle size (0.56–10 µm); were simultaneously characterized at two sites across the Mexico City Metropolitan Area (MCMA). We found differences in the chemical composition; criteria pollutants (PM2.5; O3; CO; NOx; and SO2); and biological content between northern and southern MCMA; separated by 16 km. The collected urban MCMA aerosol particles were found to act as INPs; with average concentrations ranging between 0.04±0.04L-1 (at −15 °C) and 24.9±18L-1 (at −30 °C). Although the measured INP concentrations were similar in both sites; the southern samples showed a higher INP concentration for larger aerosol particles (i.e.; particles between 5.6–10 µm). Although the urban aerosol's physicochemical properties; biological content; and its sources were found to differ at both sites; it did not strongly impact the INP concentrations; with the exception of the largest measured particles. This highlights the importance of considering that aerosol-cloud interactions above a megacity may vary; especially when assessing the role of INPs in cloud formation.
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