A wide range of California coastal stratus cloud droplet concentrations (N c ) were compared with CCN spectra to provide numerous estimates of cloud supersaturations (S). These revealed the predicted decrease of S with higher CCN concentrations (N CCN ). A significant result was frequent stratus cloud S significantly above 0.3%, especially for more maritime N CCN and N c (i.e., <300 cm −3 ). This means that much smaller and more numerous particles than previously considered interact with the most important clouds for the indirect aerosol effect.
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Hudson et al. (2010) studied this question.
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