비의류제품

new primary ice-nucleation parametrizations in an explicit cloud model

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 481
two new primary ice-nucleation parameterizations are examined in the regional atmospheric modeling system (rams) cloud model via sensitivity tests on a wintertime precipitation event in the sierra nevada region. a model combining the effects of deposition and condensation-freezing nucleation is formulated based on data obtained from continuous-flow diffusion chambers. the data indicate an exponential variation of ice-nuclei concentrations with ice supersaturation reasonably independent of temperatures between -7 degrees and -20 degrees c. predicted ice concentrations from these measurements exceed values predicted by the widely used temperature-dependent fletcher approximation by as much as one order of magnitude at temperatures warmer than -20 degrees c. a contact-freezing nucleation model is also formulated based on laboratory data gathered by various authors using techniques that isolated this nucleation mode
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