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Archive
by Scheffknecht, P., Richard, E. and Lambert, D.
Abstract:
In the framework of the Hydrological Cycle of the Mediterranean Experiment (HyMeX), the high precipitation event (HPE) of 23 October 2012 is investigated. In the morning, a highly localized convective system developed over the southeast of Corsica, close to Porto-Vecchio. Its precipitation maximum is estimated at over 100 mm within six hours. The Meso-NH model is used with a grid spacing of 2.5 km to simulate the HPE. Different input data sets and starting times are used to assess the predictability of the event. The large spread of this initial condition ensemble indicates low predictability. Among the nine ensemble members only one captures the timing and location of the event.The HPE shows some sensitivity to an increase in horizontal resolution. When the grid spacing is reduced to 500 m, precipitation is more widespread, maximum values are lower, and individual cells are smaller. Random perturbations to model physics are used to obtain a second ensemble, which shows less spread than the initial condition ensemble. The HPE over Porto-Vecchio is present in all members of the physics ensemble with varying intensity while precipitation away from orography is more sensitive. Flattening the Corsican orography removes the HPE while blocking the cold northerly inflow into the Mediterranean basin increases its duration and intensity.From the analyses and simulations it is shown that the HPE of 23 October 2012 was located over a convergence line resulting from flow splitting and lee side convergence of the northerly boundary layer flow impinging the Corsican mountains. Moist air located east of the island was fed into this convergence line by northerly low-level winds and southeasterly winds aloft advected the cells inland along the stationary convergence line, allowing large precipitation accumulations over a relatively small area.
Reference:
Scheffknecht, P., Richard, E. and Lambert, D., 2016: A highly localized high-precipitation event over CorsicaQuarterly Journal of the Royal Meteorological Society, 142, 206-221.
Bibtex Entry:
@Article{Scheffknecht2016,
  Title                    = {A highly localized high-precipitation event over Corsica},
  Author                   = {Scheffknecht, P. and Richard, E. and Lambert, D.},
  Journal                  = {Quarterly Journal of the Royal Meteorological Society},
  Year                     = {2016},

  Month                    = {August},
  Number                   = {S1},
  Pages                    = {206-221},
  Volume                   = {142},

  Abstract                 = {In the framework of the Hydrological Cycle of the Mediterranean Experiment (HyMeX), the high precipitation event (HPE) of 23 October 2012 is investigated. In the morning, a highly localized convective system developed over the southeast of Corsica, close to Porto-Vecchio. Its precipitation maximum is estimated at over 100 mm within six hours. The Meso-NH model is used with a grid spacing of 2.5 km to simulate the HPE. Different input data sets and starting times are used to assess the predictability of the event. The large spread of this initial condition ensemble indicates low predictability. Among the nine ensemble members only one captures the timing and location of the event.The HPE shows some sensitivity to an increase in horizontal resolution. When the grid spacing is reduced to 500 m, precipitation is more widespread, maximum values are lower, and individual cells are smaller. Random perturbations to model physics are used to obtain a second ensemble, which shows less spread than the initial condition ensemble. The HPE over Porto-Vecchio is present in all members of the physics ensemble with varying intensity while precipitation away from orography is more sensitive. Flattening the Corsican orography removes the HPE while blocking the cold northerly inflow into the Mediterranean basin increases its duration and intensity.From the analyses and simulations it is shown that the HPE of 23 October 2012 was located over a convergence line resulting from flow splitting and lee side convergence of the northerly boundary layer flow impinging the Corsican mountains. Moist air located east of the island was fed into this convergence line by northerly low-level winds and southeasterly winds aloft advected the cells inland along the stationary convergence line, allowing large precipitation accumulations over a relatively small area.},
  Copublication            = {3: 3 Fr},
  Doi                      = {10.1002/qj.2795},
  ISSN                     = {1477-870X},
  Keywords                 = {HyMeX; Corsica; high precipitation event; Meso-NH; deep moist onvection; orographic precipitation; ensemble simulations; Mediterranean;},
  Owner                    = {hymexw},
  Publisher                = {John Wiley \& Sons, Ltd},
  Timestamp                = {2016.08.26},
  Url                      = {http://dx.doi.org/10.1002/qj.2795}
}