contributor author | Bouttier, François | |
contributor author | Vié, Benoît | |
contributor author | Nuissier, Olivier | |
contributor author | Raynaud, Laure | |
date accessioned | 2017-06-09T17:30:04Z | |
date available | 2017-06-09T17:30:04Z | |
date copyright | 2012/11/01 | |
date issued | 2012 | |
identifier issn | 0027-0644 | |
identifier other | ams-86334.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4229881 | |
description abstract | stochastic physics scheme is tested in the Application of Research to Operations at Mesoscale (AROME) short-range convection-permitting ensemble prediction system. It is an adaptation of ECMWF?s stochastic perturbation of physics tendencies (SPPT) scheme. The probabilistic performance of the AROME model ensemble is found to be significantly improved, when verified against observations over two 2-week periods. The main improvement lies in the ensemble reliability and the spread?skill consistency. Probabilistic scores for several weather parameters are improved. The tendency perturbations have zero mean, but the stochastic perturbations have systematic effects on the model output, which explains much of the score improvement. Ensemble spread is an increasing function of the SPPT space and time correlations. A case study reveals that stochastic physics do not simply increase ensemble spread, they also tend to smooth out high-spread areas over wider geographical areas. Although the ensemble design lacks surface perturbations, there is a significant end impact of SPPT on low-level fields through physical interactions in the atmospheric model. | |
publisher | American Meteorological Society | |
title | Impact of Stochastic Physics in a Convection-Permitting Ensemble | |
type | Journal Paper | |
journal volume | 140 | |
journal issue | 11 | |
journal title | Monthly Weather Review | |
identifier doi | 10.1175/MWR-D-12-00031.1 | |
journal fristpage | 3706 | |
journal lastpage | 3721 | |
tree | Monthly Weather Review:;2012:;volume( 140 ):;issue: 011 | |
contenttype | Fulltext | |