Editorial Type:
Article
Article Type:
Research Article

Cloud Activation Characteristics of Airborne Erwinia carotovora Cells

Gary D. Franc Department of Plant Sciences, University of Wyoming, Laramie, Wyoming

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Paul J. DeMott Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado

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Print Publication:
01 Oct 1998
DOI:
https://doi.org/10.1175/1520-0450(1998)037<1293:CACOAE>2.0.CO;2
Page(s):
1293–1300
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Abstract

Several strains of plant pathogenic bacteria, Erwinia carotovora carotovora and E. carotovora atroseptica, were observed to be active as cloud condensation nuclei (CCN). The CCN supersaturation spectra of bacterial aerosols were measured in the laboratory and compared to the activity of ammonium sulfate. Approximately 25%–30% of the aerosolized bacterial cells activated droplets at 1% water supersaturation compared to 80% activation of the ammonium sulfate aerosol. Physical and numerical simulations of cloud droplet activation and growth on bacteria were also performed. Both simulations predict that aerosolized bacteria will be incorporated into cloud droplets during cloud formation. Results strongly support the hypothesis that significant numbers of the tested bacterial strains are actively involved in atmospheric cloud formation and precipitation processes following natural aerosolization and vertical transport to cloud levels.

Corresponding author address: Gary D. Franc, Department of Plant Sciences, University of Wyoming, P.O. Box 3354, Laramie, WY 82071-3354.

Abstract

Several strains of plant pathogenic bacteria, Erwinia carotovora carotovora and E. carotovora atroseptica, were observed to be active as cloud condensation nuclei (CCN). The CCN supersaturation spectra of bacterial aerosols were measured in the laboratory and compared to the activity of ammonium sulfate. Approximately 25%–30% of the aerosolized bacterial cells activated droplets at 1% water supersaturation compared to 80% activation of the ammonium sulfate aerosol. Physical and numerical simulations of cloud droplet activation and growth on bacteria were also performed. Both simulations predict that aerosolized bacteria will be incorporated into cloud droplets during cloud formation. Results strongly support the hypothesis that significant numbers of the tested bacterial strains are actively involved in atmospheric cloud formation and precipitation processes following natural aerosolization and vertical transport to cloud levels.

Corresponding author address: Gary D. Franc, Department of Plant Sciences, University of Wyoming, P.O. Box 3354, Laramie, WY 82071-3354.

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  • Blanchard, D. C., and L. D. Syzdek, 1982: Water-to-air transfer and enrichment of bacteria in drops from bursting bubbles. Appl. Environ. Microbiol.,43, 1001–1005.

  • DeMott, P. J., and D. C. Rogers, 1990: Freezing nucleation rates of dilute solution droplets measured between −30° and −40°C in laboratory simulations of natural clouds. J. Atmos. Sci.,47, 1056–1064.

  • Franc, G. D., 1988: Long distance transport of Erwinia carotovora in the atmosphere and surface water. Ph.D. dissertation, Colorado State University, Fort Collins, CO, 131 pp. [Available from Dept. of Bioagricultural Sciences and Pest Management, Fort Collins, CO 80523–1177.].

  • ——, 1994: Atmospheric transport of Erwinia carotovora. Proc. 21st Conf. on Agricultural and Forest Meteorology and 11th Conf. on Biometeorology and Aerobiology, San Diego, CA, Amer. Meteor. Soc., 435–437.

  • ——, M. D. Harrison, and M. L. Powelson, 1985: The dispersal of phytopathogenic bacteria. The Movement and Dispersal of Agriculturally Important Biotic Agents, D. R. MacKenzie, C. S. Barfield, G. C. Kennedy, R. D. Berger, and D. J. Taranto, Eds., Claitors, 37–49.

  • Graham, D. C., C. E. Quinn, I. A. Sells, and M. D. Harrison, 1979:Survival of strains of soft rot coliform bacteria on microthreads exposed in the laboratory and in the open air. J. Appl. Bacteriol.,46, 367–376.

  • Harrison, M. D., and L. W. Nielsen, 1981: Blackleg and bacterial soft rot. Compendium of Potato Diseases, W. J. Hooker, Ed., American Phytopathological Society, 27–29.

  • ——, G. D. Franc, D. A. Maddox, J. E. Michaud, and N. J. McCarter-Zorner, 1987: Presence of Erwinia carotovora in surface water in North America. J. Appl. Bacteriol.,62, 565–570.

  • Hobbs, P. V., D. A. Bowdle, and L. F. Radke, 1985: Particles in the lower troposphere over the high plains of the United States. Part II: Cloud condensation nuclei. J. Climate Appl. Meteor.,24, 1358–1369.

  • Jensen-Leute, T. L., and S. M. Kreidenweis, 1993: Studies of the relationship between submicron aerosol and initial marine stratus properties. Department of Atmospheric Science Paper No. 545, Colorado State University, Fort Collins, CO, 182 pp. [Available from Dept. of Atmospheric Science, Colorado State University, Fort Collins, CO 80523.].

  • Levin, Z., S. A. Yankofsky, D. Pardes, and M. Magal, 1987: Possible application of bacterial condensation freezing to artificial rainfall enhancement. J. Climate Appl. Meteor.,26, 1188–1197.

  • Martin, J. J., P. K. Wang, and H. R. Pruppacher, 1980: A theoretical determination of the efficiency with which aerosol particles are collected by simple ice crystal plates. J. Atmos. Sci.,37, 1628–1638.

  • McCarter-Zorner, N. J., G. D. Franc, M. D. Harrison, J. E. Michaud, C. E. Quinn, I. A. Sells, and D. C. Graham, 1984: Soft rot Erwinia bacteria in surface and underground waters in southern Scotland and in Colorado, United States. J. Appl. Bacteriol.,57, 95–105.

  • Mitra, S. K., U. Barth, and H. R. Pruppacher, 1990: A laboratory study of the efficiency with which aerosol particles are scavenged by snow flakes. Atmos. Environ.,24A, 1247–1254.

  • Nimitz, K. S., and M. Plooster, 1980: Atmospheric Cloud Physics Laboratory (ACPL) simulation system mathematical description. Huntsville Operations, General Electric Co., Huntsville, AL, 89 pp. [Available from Dept. of Atmospheric Science, Colorado State University, Fort Collins, CO 80523.].

  • Plooster, M. N., 1985: Computer models for simulation of experiments in the Atmospheric Cloud Physics Laboratory (ACPL). Rep. 5-31701, Denver Research Institute, University of Denver, Denver, CO, 78 pp. [Available from Denver Research Institute, 2050 E. Iliff Ave., Denver, CO 80208.].

  • Pruppacher, H. R., and J. D. Klett, 1978: Microphysics of Clouds and Precipitation. D. Reidel, 714 pp.

  • Radke, L. F., and P. V. Hobbs, 1969: An automatic cloud condensation nuclei counter. J. Appl. Meteor.,8, 105–109.

  • Rauber, R. M., 1987: Characteristics of cloud ice and precipitation during wintertime storms over the mountains of northern Colorado. J. Climate Appl. Meteor.,26, 488–524.

  • ——, and L. O. Grant, 1986: The characteristics and distribution of cloud water over the mountains of northern Colorado during wintertime storms. Part II: Spatial distribution and microphysical characteristics. J. Climate Appl. Meteor.,25, 489–504.

  • Slinn, W. G. N., 1974: Rate-limiting aspects of in-cloud scavenging. J. Atmos. Sci.,31, 1172–1174.

  • Snider, J. R., R. G. Layton, G. Caple, and D. Chapman, 1985: Bacteria as condensation nuclei. J. Rech. Atmos.,19, 139–145.

  • Song, N., and D. Lamb, 1994: Experimental investigations of ice in supercooled clouds. Part II: Scavenging of an insoluble aerosol. J. Atmos. Sci.,51, 104–116.

  • Ward, P. J., and P. J. DeMott, 1989: Preliminary experimental evaluation of Snomax™, Pseudomonas syringae, as an artificial ice nucleus for weather modification. J. Wea. Mod.,21, 9–13.

  • Young, K. C., 1974: The role of contact nucleation in ice phase initiation in clouds. J. Atmos. Sci.,31, 768–776.

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