*This item and others will be in the monthly “Solar Geoengineering Updates Substack” newsletter:* https://solargeoengineeringupdates.substack.com/ -----------------------------------------------------------------
https://essopenarchive.org/doi/full/10.22541/essoar.170067095.53864217/v1 *Authors* Kevin Mitchell Smalley,Matthew Lebsock,Ryan Eastman *22 November 2023* *Cite as*: Kevin Mitchell Smalley, Matthew Lebsock, Ryan Eastman. Diurnal Patterns in the Observed Cloud Liquid Water Path Response to Droplet Number Perturbations. ESS Open Archive . November 22, 2023. DOI: 10.22541/essoar.170067095.53864217/v1 *Abstract* A key uncertainty in Aerosol-cloud interactions is the cloud liquid water path (LWP) response to increased aerosols (λ). LWP can either increase due to precipitation suppression or decrease due to entrainment-drying. Previous research suggests that precipitation suppression dominates in thick clouds, while entrainment-drying prevails in thin clouds. The time scales of the two competing effects are vastly different, requiring temporally resolved observations. We analyze 3-day Lagrangian trajectories of stratocumulus clouds over the southeast Pacific using geostationary data. We find that clouds with a LWP exceeding 200 g m-2 exhibit a positive response, while clouds with lower LWP show a negative response. We observe a significant diurnal cycle in λ, indicating a more strongly negative daytime adjustment driven by entrainment-drying. In contrast, at night, precipitation suppression can occasionally fully counteract the entrainment-drying mechanism. The time-integrated adjustment appears weaker than previously suggested in studies that do not account for the diurnal cycle. *Source: ESS OPEN ARCHIVE* -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAHJsh98A%2B4BYNmV1J5aUrBxhLe7n9hiPKVioWm%3DMy8CVNp7MaA%40mail.gmail.com.
