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Observational Constraint on Cloud Susceptibility Weakened by Aerosol Retrieval Limitations
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Observational Constraint on Cloud Susceptibility Weakened by Aerosol Retrieval Limitations
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Journal Article
Observational Constraint on Cloud Susceptibility Weakened by Aerosol Retrieval Limitations
2018
Overview
Aerosol-cloud interactions remain a major uncertainty in climate research. Studies have indicated that model estimates of cloud susceptibility to aerosols frequently exceed satellite estimates, motivating model reformulations to increase agreement. Here we show that conventional ways of using satellite information to estimate susceptibility can serve as only a weak constraint on models because the estimation is sensitive to errors in the retrieval procedures. Using instrument simulators to investigate differences between model and satellite estimates of susceptibilities, we find that low aerosol loading conditions are not well characterized by satellites, but model clouds are sensitive to aerosol perturbations in these conditions. We quantify the observational requirements needed to constrain models, and find that the nighttime lidar measurements of aerosols provide a better characterization of ten- uous aerosols. We conclude that observational uncertainties and limitations need to be accounted for when assessing the role of aerosols in the climate system.
Publisher
Nature Research,Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
