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Zusammenfassung:
Comprehending the intricate interplay between atmospheric aerosols and water vapour in subsaturated regions is vital for
accurate modelling of aerosol–cloud–radiation–climate dynamics. But the microphysical mechanisms governing these inter-
actions with ambient aerosols remain inadequately understood. Here we report results from high-altitude, relatively pristine
site in Western-Ghats of India during monsoon, serving as a baseline for climate processes in one of the world’s most pol-
luted regions. Utilizing a novel quartz crystal microbalance (QCM) approach, we conducted size-resolved sampling to anal-
yse humidity-dependent growth factors, hygroscopicity, deliquescence behaviour, and aerosol liquid water content (ALWC).
Fine-mode aerosols ([?]2.5 μm) exhibited size-dependent interactions with water vapour, contributing significantly to ALWC.
Deliquescence was observed in larger aerosols (>180 nm), influenced by organic species, with deliquescence relative humidity
(DRH) lower than that of pure inorganic salts. This research highlights the significance of understanding ambient aerosol-water
interactions and hygroscopicity for refining climate models in subsaturated conditions.
