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R2D2 v2.0: accounting for temporal dependences in multivariate bias correction via analogue rank resampling

机译:R2D2 V2.0:通过模拟等级重采样计算多变量偏置校正中的时间依赖性

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Over the last few years, multivariate bias correction methods have been developed to adjust spatial and/or inter-variable dependence properties of climate simulations. Most of them do not correct – and sometimes even degrade – the associated temporal features. Here, we propose a multivariate method to adjust the spatial and/or inter-variable properties while also accounting for the temporal dependence, such as autocorrelations. Our method consists of an extension of a previously developed approach that relies on an analogue-based method applied to the ranks of the time series to be corrected rather than to their “raw” values. Several configurations are tested and compared on daily temperature and precipitation simulations over Europe from one Earth system model. Those differ by the conditioning information used to compute the analogues and can include multiple variables at each given time, a univariate variable lagged over several time steps or both – multiple variables lagged over time steps. Compared to the initial approach, results of the multivariate corrections show that, while the spatial and inter-variable correlations are still satisfactorily corrected even when increasing the dimension of the conditioning, the temporal autocorrelations are improved with some of the tested configurations of this extension. A major result is also that the choice of the information to condition the analogues is key since it partially drives the capability of the proposed method to reconstruct proper multivariate dependences.
机译:在过去的几年中,已经开发了多变量偏压校正方法来调整气候模拟的空间和/或可变间依赖性。其中大多数都不正确 - 有时甚至降级 - 相关的时间特征。在这里,我们提出了一种多变量方法来调整空间和/或变量间属性,同时还考虑时间依赖性,例如自相关。我们的方法包括以前开发的方法的扩展,依赖于应用于校正的时间序列的基于模拟的方法而不是它们的“原始”值。从一个地球系统模型测试了几种配置,并比较了欧洲的日常温度和降水模拟。用于计算模拟的调节信息的调节信息不同,并且可以在每个给定时间内包括多个变量,一个单变量变量滞后于多个时间步长或两者 - 多个变量滞后随时间步骤滞后。与初始方法相比,多元校正的结果表明,虽然即使在增加调节的尺寸时,虽然即使在增加调节的尺寸时仍然令人满意地校正,但是随着该扩展的一些测试配置,即使在调节的尺寸上仍然令人满意地校正。主要结果也是要调节类似物的信息的选择是关键,因为它部分驱动了所提出的方法重建适当的多变量依赖性的能力。

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