CCN activity of six pollenkitts and the influence of their surface activity
| Autor: | J. Carson Meredith, Jack J. Lin, Sara Purdue, Nønne L. Prisle, Athanasios Nenes, Haisheng Lin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Ammonium sulfate Aqueous solution 010504 meteorology & atmospheric sciences Salt (chemistry) 010501 environmental sciences medicine.disease_cause 01 natural sciences Surface tension chemistry.chemical_compound chemistry Chemical engineering Pulmonary surfactant Pollen medicine Dispersion (chemistry) Chemical composition 0105 earth and related environmental sciences |
| DOI: | 10.5194/acp-2018-394 |
| Popis: | Pollenkitt is a viscous material that coats grains of pollen and plays important roles in pollen dispersion and plant reproduction. It may also be an important contributor to pollen water uptake and CCN activity. The chemical composition of pollenkitt varies between species, but has been found to comprise complex organic mixtures including oxygenated, lipid, and aliphatic functionalities. The mix of functionalities suggests that pollenkitt may display aqueous surface activity, which could significantly impact pollen interactions with atmospheric water. Here, we study the surface activity of pollenkitt from six different species and its impact on pollenkitt hygroscopicity. We measure cloud activation and concentration dependent surface tension of pollenkitt and its mixtures with ammonium sulfate salt. Experiments are compared to predictions from several thermodynamic models, taking aqueous surface tension reduction and surfactant surface partitioning into account in various ways. We find a clear reduction of surface tension by pollenkitt in aqueous solution and evidence for impact of both surface tension and surface partitioning mechanisms on cloud activation potential and hygroscopicity. In addition, we find indication of significant impact of complex non-ideal solution effects in systematic and consistent size dependency of pollenkitt hygroscopicity. |
| Databáze: | OpenAIRE |
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