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DESCRIPTION:Atmospheric and Oceanic Sciences Departmental Seminar Series\n
 \npresents\n\nTowards a New Paradigm of Parameterizing Ice-Phase Microphys
 ics in Atmospheric Models\n\na talk by\n\nJason Milbrandt\n	Research Scient
 ist\,\n	Atmospheric Numerical Weather Prediction Research Section\, Meteoro
 logical Research Division\, Environment and Climate Change Canada \n\nThe 
 representation of cloud and precipitation microphysics in atmospheric mode
 ls – both for research and numerical weather prediction – has advanced con
 siderably in the past four decades. In 3D models\, the most common approac
 h is to use a bulk microphysics scheme (BMS)\, in which the size distribut
 ions of each of the various hydrometeor categories is represented by an an
 alytic function and through the prediction of one or more moments of the d
 istribution\, where the moments are related to bulk physical quantities (e
 .g. the mass mixing ratio). The early BMSs were single-moment schemes with
  a limited number of hydrometeor categories and microphysical processes. O
 ver the years\, these schemes have become more complex and with many more 
 categories\, prognostic moments\, and parameterized processes. This includ
 es the detailed\, triple-moment Milbrandt-Yau BMS\, developed at 91���� ne
 arly 20 years ago.\n\nIn the past decade\, there has been a shift in think
 ing amongst model developers on how best to represent ice-phase hydrometeo
 rs. The shift has been a move away from the traditional notion of includin
 g more and more representative categories (e.g. graupel) and towards incre
 ased emphasis on the prediction of physical properties (e.g. density). As 
 part of this shift\, we have developed a new BMS that completely abandons 
 the use of pre-defined categories and uses one or more “free” categories t
 o represent all ice-phase hydrometeors. Each category has between four and
  six prognostic variables from which a variety of physical properties of i
 ce can be computed. Unlike traditional schemes in which such properties ar
 e prescribed and often fixed\, the ice properties in the new scheme evolve
  continuously and more realistically due to microphysical processes. As su
 ch\, we refer to this new parameterization as the Predicted Particle Prope
 rties (P3) microphysics scheme.\n\nA general background on the concepts of
  representing cloud microphysics in models will be given along with some h
 istorical details of the evolution of the development towards detailed tra
 ditional microphysics schemes. An overview of the P3 microphysics scheme w
 ill be provided\, along with illustrations of the benefits of the “free” c
 ategory approach.\n\nMonday Jan 27/ 3:30 PM/ Burnside Hall/ Room 934\n
DTSTART:20200127T203000Z
DTEND:20200127T220000Z
LOCATION:Room 934
SUMMARY:Towards a New Paradigm of Parameterizing Ice-Phase Microphysics in 
 Atmospheric Models
URL:/meteo/channels/event/towards-new-paradigm-paramet
 erizing-ice-phase-microphysics-atmospheric-models-308849
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