Abstract
The potential for atmospheric aerosol particles to exist as metastable aqueous droplets instead of in their thermodynamically favoured crystalline solid phase has many implications for atmospheric physics and chemistry. Aqueous droplets are larger than their dry counterparts1 and generally scatter more light2,3. Also, the existence of an aqueous phase influences the oxidation, equilibrium vapour pressure and mass-transfer kinetics of trace gases4–9. Here we report observations at three urban and rural sites, showing that metastable droplets existed more than 50% of the time when the ambient relative humidity was between ∼45 and 75%. At one site, more than 10% of the aerosol's light-scattering coefficient was attributed to metastable liquid H2O when the relative humidity was greater than 55%. These results indicate that metastable droplets are ubiquitous in nature, although the full ramifications of these observations are still unclear.
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References
Orr, C., Hurd, F. K. & Corbett, W. J. J. Colloid Sci. 13, 472–482 (1958).
Toon, O. B. & Pollack, J. B. J. appl. Met. 15, 225–246 (1976).
Sloane, C. S. Atmos. Envir. 18, 871–878 (1984).
Larson, T. V. & Taylor, G. S. Atmos. Envir. 17, 2489–2495 (1983).
Freiberg, J. Envir. Sci. Technol. 8, 731–734 (1974).
Cadle, R. D. & Robbins, R. C. Discuss. Faraday Soc. 30, 155–166 (1961).
Brock, J. R. & Durham, J. L. in SO2, NO and NO2 Oxidation Mechanisms: Atmospheric Considerations (ed. Calvert, J. G.) 209–249 (Ann Arbor Science, Boston, 1984).
Hoffman, M. R. & Jacob, D. J. in SO2, NO and NO2 Oxidation Mechanisms: Atmospheric Considerations (ed. Calvert, J. G.) 101–172 (Ann Arbor Science, Boston, 1984).
Penkett, S. A., Jones, B. M. R., Brice, K. A. & Eggleton, A. E. J. Atmos. Envir. 13, 123–137 (1979).
Pruppacher, H. R. & Klett, J. D. Microphysics of Clouds and Precipitation 73 (Reidel, London, 1980).
Brosset, C. Atmos. Envir. 12, 25–38 (1978).
Ono, A. Atmos. Envir. 12, 753–757 (1978).
Dessens, H. Q. J. R. met. Soc. 75, 23–26 (1949).
Junge, C. Air Chemistry and Radioactivity 133 (Academic Press, New York, 1963).
Winkler, P. Aerosol Sci. 4, 373–387 (1973).
Hänel, G. Adv. Geophys. 3, 73–188 (1976).
Tang, I. N. in Generation of Aerosols and Facilities for Exposure Experiments (ed. Willeke, K.) 153–167 (Ann Arbor Science, Ann Arbor, 1980).
Spann, J. F. & Richardson, C. B. Atmos. Envir. 19, 819–825 (1985).
Larson, T. V., Ahlquist, N. C., Weiss, R. E., Covert, D. S. & Waggoner, A. P. Atmos. Envir. 16, 1587–1590 (1982).
Rood, M. J., Covert, D. S. & Larson, T. V. Tellus 39B, 383–397 (1987).
Rood, M. J., Covert, D. S. & Larson, T. V. Aerosol Sci. Technol. 7, 57–65 (1987).
Malm, W. C. & Molenar, J. V. J. Air Pollut. Control Ass. 34 (9) 899–904 (1984).
Ferek, R. J., Farber, R. J. & Bhardwaja, P. S. in Trans. Visibility Conf., Research and Policy Aspects (ed. Bhardwaja, P. S.) 57–75 (1987).
Larson, S. M. & Cass, G. R. Envir. Sci. Technol. (in the press).
Waggoner, A. P. & Weiss, R. E. Atmos. Envir. 14, 623–626 (1980).
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Rood, M., Shaw, M., Larson, T. et al. Ubiquitous nature of ambient metastable aerosol. Nature 337, 537–539 (1989). https://doi.org/10.1038/337537a0
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DOI: https://doi.org/10.1038/337537a0
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