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Archive
by Augros, C., Caumont, O., Ducrocq, V., Gaussiat, N. and Tabary, P.
Abstract:
This paper describes a forward observation operator for polarimetric radar variables, developed within the research mesoscale non-hydrostatic model Meso-NH. The forward operator enables direct comparisons of atmospheric simulations with polarimetric radar observations and constitutes a first step towards the assimilation of polarimetric radar data. The parameters of the polarimetric forward operator were defined in order to be consistent (whenever possible) with the model microphysical parametrization. Subjective and quantitative comparisons between observations and simulations are analysed for S, C, and X-band radars for two convective cases that were observed in autumn 2012 in South-Eastern France during the first observing period (SOP1) of HyMeX campaign. The good consistency between the medians of the observed and simulated distributions of Zdr and Kdp as a function of Zhh, in rain and in dry snow, enables the validation of the parametrization of the polarimetric forward operator. However, the higher spread in observed Zdr and Zdp (due to noise and microphysical variability) reveals a need for a careful data quality control and pre-processing for use in assimilation. Comparisons between observed and simulated vertical profiles of Zhh, Zdp and Zdr in convective areas also show a generally good agreement. Some differences between observations and simulations are attributed to model limitations, in particular because of its one-moment microphysics scheme and its coarser resolution.
Reference:
Augros, C., Caumont, O., Ducrocq, V., Gaussiat, N. and Tabary, P., 2016: Comparisons between S-, C-, and X-band polarimetric radar observations and convective-scale simulations of the HyMeX first special observing periodQuarterly Journal of the Royal Meteorological Society, 142, 347-362.
Bibtex Entry:
@Article{Augros2016,
  Title                    = {Comparisons between S-, C-, and X-band polarimetric radar observations and convective-scale simulations of the HyMeX first special observing period},
  Author                   = {Augros, C. and Caumont, O. and Ducrocq, V. and Gaussiat, N. and Tabary, P.},
  Journal                  = {Quarterly Journal of the Royal Meteorological Society},
  Year                     = {2016},

  Month                    = {August},
  Number                   = {S1},
  Pages                    = {347-362},
  Volume                   = {142},

  Abstract                 = {This paper describes a forward observation operator for polarimetric radar variables, developed within the research mesoscale non-hydrostatic model Meso-NH. The forward operator enables direct comparisons of atmospheric simulations with polarimetric radar observations and constitutes a first step towards the assimilation of polarimetric radar data. The parameters of the polarimetric forward operator were defined in order to be consistent (whenever possible) with the model microphysical parametrization. Subjective and quantitative comparisons between observations and simulations are analysed for S, C, and X-band radars for two convective cases that were observed in autumn 2012 in South-Eastern France during the first observing period (SOP1) of HyMeX campaign. The good consistency between the medians of the observed and simulated distributions of Zdr and Kdp as a function of Zhh, in rain and in dry snow, enables the validation of the parametrization of the polarimetric forward operator. However, the higher spread in observed Zdr and Zdp (due to noise and microphysical variability) reveals a need for a careful data quality control and pre-processing for use in assimilation. Comparisons between observed and simulated vertical profiles of Zhh, Zdp and Zdr in convective areas also show a generally good agreement. Some differences between observations and simulations are attributed to model limitations, in particular because of its one-moment microphysics scheme and its coarser resolution.},
  Copublication            = {5: 5 Fr},
  Doi                      = {10.1002/qj.2572},
  ISSN                     = {1477-870X},
  Keywords                 = {Polarimetric; radar; forward operator; convective scale simulations;},
  Owner                    = {hymexw},
  Publisher                = {John Wiley \& Sons, Ltd},
  Timestamp                = {2016.08.26},
  Url                      = {http://dx.doi.org/10.1002/qj.2572}
}