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Geographic, seasonal, and precipitation chemistry influence on the abundance and activity of biological ice nucleators in rain and snow

Christner, Brent C ; Cai, Rongman ; Morris, Cindy E ; McCarter, Kevin S ; Foreman, Christine M ; Skidmore, Mark L ; Montross, Scott N ; Sands, David C

Proceedings of the National Academy of Sciences - PNAS, 2008-12, Vol.105 (48), p.18854-18859 [Periódico revisado por pares]

United States: National Academy of Sciences

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  • Título:
    Geographic, seasonal, and precipitation chemistry influence on the abundance and activity of biological ice nucleators in rain and snow
  • Autor: Christner, Brent C ; Cai, Rongman ; Morris, Cindy E ; McCarter, Kevin S ; Foreman, Christine M ; Skidmore, Mark L ; Montross, Scott N ; Sands, David C
  • Assuntos: Antarctic Regions ; Atmospherics ; Bacteria ; Biological Sciences ; Chemical Precipitation ; Clouds ; Cluster Analysis ; Cold Climate ; Crystallization ; Environmental Sciences ; France ; Freezing ; Geography ; Global Changes ; Ice ; Ice nuclei ; Louisiana ; Montana ; Nucleation ; Physical Sciences ; Precipitation ; Rain ; Rain - chemistry ; Rain - microbiology ; Seasons ; Snow ; Snow - chemistry ; Snow - microbiology ; Statistical analysis ; Temperature ; Water - analysis ; Yukon Territory
  • É parte de: Proceedings of the National Academy of Sciences - PNAS, 2008-12, Vol.105 (48), p.18854-18859
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    Author contributions: B.C.C., C.E.M., and D.C.S. designed research; B.C.C., R.C., and C.E.M. performed research; C.M.F., M.L.S., and S.N.M. contributed new reagents/analytic tools; B.C.C., R.C., and K.S.M. analyzed data; and B.C.C. wrote the paper.
    Communicated by P. Buford Price, Jr., University of California, Berkeley, CA, October 7, 2008
    2Present address: Department of Plant Pathology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061.
  • Descrição: Biological ice nucleators (IN) function as catalysts for freezing at relatively warm temperatures (warmer than -10 °C). We examined the concentration (per volume of liquid) and nature of IN in precipitation collected from Montana and Louisiana, the Alps and Pyrenees (France), Ross Island (Antarctica), and Yukon (Canada). The temperature of detectable ice-nucleating activity for more than half of the samples was greater-than-or-equal -5 °C based on immersion freezing testing. Digestion of the samples with lysozyme (i.e., to hydrolyze bacterial cell walls) led to reductions in the frequency of freezing (0-100%); heat treatment greatly reduced (95% average) or completely eliminated ice nucleation at the measured conditions in every sample. These behaviors were consistent with the activity being bacterial and/or proteinaceous in origin. Statistical analysis revealed seasonal similarities between warm-temperature ice-nucleating activities in snow samples collected over 7 months in Montana. Multiple regression was used to construct models with biogeochemical data [major ions, total organic carbon (TOC), particle, and cell concentration] that were accurate in predicting the concentration of microbial cells and biological IN in precipitation based on the concentration of TOC, Ca²⁺, and NH[Formula: see text], or TOC, cells, Ca²⁺, NH[Formula: see text], K⁺, PO[Formula: see text], SO[Formula: see text], Cl⁻, and HCO[Formula: see text]. Our results indicate that biological IN are ubiquitous in precipitation and that for some geographic locations the activity and concentration of these particles is related to the season and precipitation chemistry. Thus, our research suggests that biological IN are widespread in the atmosphere and may affect meteorological processes that lead to precipitation.
  • Editor: United States: National Academy of Sciences
  • Idioma: Inglês
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