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Hygroscopicity and cloud droplet activation of mineral dust aerosol
Open accessAbstract
Hygroscopicity and cloud condensation nucleus (CCN) activity were measured for three mineral dust samples: one from the Canary Islands, representing North African dust transported across the Atlantic; one from outside Cairo, representing North African dust transported to the eastern Mediterranean; and Arizona Test Dust, representing dust in the southwestern United States. To reaerosolize bulk samples, dust samples were either suspended in high purity water and particles generated by atomization, or samples were resuspended in dry air using a fluidized bed. Only the Canary Island sample generated from aqueous suspension showed appreciable hygroscopic growth at subsaturated conditions; all other samples exhibited diameter growth factors of less than 1.1 for relative humidities ≤90%. Despite their low hygroscopicities at subsaturated conditions, all samples activated as cloud droplets at supersaturations lower than required for insoluble particles. We suggest that the CCN activity of these mineral dusts are well‐represented using the hygroscopicity parameter 0.01 ≤ κ ≤ 0.08.
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Prenni, A. J., Siefert, R. L., Onasch, T. B., Tolbert, M. A., & Demott, P. J. (2000) · Aerosol Science and Technology · doi:10.1080/027868200303588 · Cited by 23
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Hatch, C. D., Wiese, J. S., Crane, C. C., Harris, K. J., Kloss, H. G., & Baltrusaitis, J. (2012) · Langmuir · doi:10.1021/la2042873 · Cited by 290
Climatic impacts of stratospheric geoengineering with sulfate, black carbon and titania injection
Jones, A. C., Haywood, J. M., & Jones, A. (2016) · Atmospheric Chemistry and Physics · doi:10.5194/acp-16-2843-2016 · Cited by 67
Metadata
- Authors
- Koehler, K. A., Kreidenweis, S. M., DeMott, P. J., Petters, M. D., Prenni, A. J., & Carrico, C. M.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2009-04
- Volume
- 36
- Issue
- 8
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1981410232
- Cited by
- 211
- References
- 1
- FWCI
- 11.40
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Koehler, K. A., Kreidenweis, S. M., DeMott, P. J., Petters, M. D., Prenni, A. J., & Carrico, C. M. (2009). Hygroscopicity and cloud droplet activation of mineral dust aerosol. Geophysical Research Letters. https://doi.org/10.1029/2009gl037348
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