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MBC is an R
package for calibrating and applying univariate and multivariate bias
correction algorithms for climate model simulations of multiple climate
variables. Three iterative multivariate methods are supported: (i) MBC
Pearson correlation (MBCp), (ii) MBC rank correlation
(MBCr), and (iii) MBC N-dimensional probability density
function transform (MBCn). The first two, MBCp
and MBCr (Cannon, 2016), match marginal distributions and
inter-variable dependence structure. Dependence structure can be
measured either by the Pearson correlation (MBCp) or by the
Spearman rank correlation (MBCr). The energy distance score
(escore) is recommended for model selection. The third,
MBCn (Cannon, 2018), which operates on the full
multivariate distribution, is more flexible and can be considered to be
a multivariate analogue of univariate quantile mapping. All aspects of
the observed distribution are transferred to the climate model
simulations. In each of the three methods, marginal distributions are
corrected by the univariate change-preserving quantile delta mapping
(QDM) algorithm (Cannon et al., 2015). Finally, an
implementation of the Rank Resampling for Distributions and Dependences
(R2D2) method introduced by Vrac (2018) is also
included.
Cannon, A.J., 2018. Multivariate quantile mapping bias correction: An N-dimensional probability density function transform for climate model simulations of multiple variables. Climate Dynamics, 50(1-2):31-49. doi:10.1007/s00382-017-3580-6
Cannon, A.J., 2016. Multivariate bias correction of climate model output: Matching marginal distributions and inter-variable dependence structure. Journal of Climate, 29:7045-7064. doi:10.1175/JCLID-15-0679.1
Cannon, A.J., S.R. Sobie, and T.Q. Murdock, 2015. Bias correction of simulated precipitation by quantile mapping: How well do methods preserve relative changes in quantiles and extremes? Journal of Climate, 28:6938-6959. doi:10.1175/JCLI-D-14-00754.1
Francois, B., M. Vrac, A.J. Cannon, Y. Robin, and D. Allard, 2020. Multivariate bias corrections of climate simulations: Which benefits for which losses? Earth System Dynamics, 11:537-562. doi:10.5194/esd-11-537-2020
Vrac, M., 2018. Multivariate bias adjustment of high-dimensional climate simulations: the Rank Resampling for Distributions and Dependences (R2D2) bias correction. Hydrology and Earth System Sciences, 22:3175-3196. doi:10.5194/hess-22-3175-2018
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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