precipitation bias correction of very high resolution regional climate models
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ID: 128289
2013
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Abstract
Regional climate models are prone to biases in precipitation that are
problematic for use in impact models such as hydrology models. A large number
of methods have already been proposed aimed at correcting various moments of
the rainfall distribution. They all require that the model produce the same
or a higher number of rain days than the observational data sets, which are
usually gridded data sets. Models have traditionally met this condition
because their spatial resolution was coarser than the observational grids.
But recent climate simulations use higher resolution and the models are
likely to systematically produce fewer rain days than the gridded
observations.
In this study, model outputs from a simulation at 2 km resolution are compared with gridded and in situ observational data sets to determine whether the new scenario calls for revised methodologies. The gridded observations are found to be inadequate to correct the high-resolution model at daily timescales, because they are subjected to too frequent low intensity precipitation due to spatial averaging. A histogram equalisation bias correction method was adapted to the use of station, alleviating the problems associated with relative low-resolution observational grids. The wet-day frequency condition might not be satisfied for extremely dry biases, but the proposed approach substantially increases the applicability of bias correction to high-resolution models. The method is efficient at bias correcting both seasonal and daily characteristic of precipitation, providing more accurate information that is crucial for impact assessment studies.
In this study, model outputs from a simulation at 2 km resolution are compared with gridded and in situ observational data sets to determine whether the new scenario calls for revised methodologies. The gridded observations are found to be inadequate to correct the high-resolution model at daily timescales, because they are subjected to too frequent low intensity precipitation due to spatial averaging. A histogram equalisation bias correction method was adapted to the use of station, alleviating the problems associated with relative low-resolution observational grids. The wet-day frequency condition might not be satisfied for extremely dry biases, but the proposed approach substantially increases the applicability of bias correction to high-resolution models. The method is efficient at bias correcting both seasonal and daily characteristic of precipitation, providing more accurate information that is crucial for impact assessment studies.
| Reference Key |
argeso2013hydrologyprecipitation
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|---|---|
| Authors | ;D. Argüeso;J. P. Evans;L. Fita |
| Journal | materials research bulletin |
| Year | 2013 |
| DOI |
10.5194/hess-17-4379-2013
|
| URL | |
| Keywords | Keywords not found |
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