On the Remapping Procedure of Daily Precipitation Statistics and Indices Used in Regional Climate Model Evaluation

Diaconescu, Emilia Paula; Gachon, Philippe et Laprise, René (2015). « On the Remapping Procedure of Daily Precipitation Statistics and Indices Used in Regional Climate Model Evaluation ». Journal of Hydrometeorology, 16(6), pp. 2301-2310.

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Résumé

Gridded estimates of precipitation using both satellite and observational station data are regularly used as reference products in the evaluation of basic climate fields and derived indices as simulated by regional climate models (RCMs) over the current period. One of the issues encountered in RCM evaluation is the fact that RCMs and reference fields are usually on different grids and often at different horizontal resolutions. A proper RCM evaluation requires remapping on a common grid. For the climate indices or other derived fields, the remapping can be done in two ways: either as a first-step operation on the original field with the derived index computed on the final/common grid in a second step, or to compute first the climate index on the original grid before remapping or regridding it as a last-step operation on the final/common grid. The purpose of this paper is to illustrate how the two approaches affect the final field, thus contributing to one of the Coordinated Regional Climate Downscaling Experiment (CORDEX) in Africa (CORDEX-Africa) goals of providing a benchmark framework for RCM evaluation over the West Africa monsoon area, using several daily precipitation indices. The results indicate the advantage of using the last-step remapping procedure, regardless of the mathematical method chosen for the remapping, in order to minimize errors in the indices under evaluation.

Type:	Article de revue scientifique
Mots-clés ou Sujets:	climate modeling, downscaling; precipitation (climatology), regional climate
Unité d'appartenance:	Centres institutionnels > Centre pour l'étude et la simulation du climat à l'échelle régionale (ESCER) Faculté des sciences > Département des sciences de la Terre et de l'atmosphère
Déposé par:	René Laprise
Date de dépôt:	30 mars 2016 15:24
Dernière modification:	19 avr. 2016 18:12
Adresse URL :	http://archipel.uqam.ca/id/eprint/8043

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