Application of Wavelet Transform for Bias Correction and Predictor Screening of Climate Data

Abstract

Climate model (CM) statistical downscaling requires quality and quantity modifications of the CM’s outputs to increase further modeling accuracy. In this respect, multi-resolution wavelet transform (WT) was employed to determine the hidden resolutions of climate signals and eliminate bias in a CM. The results revealed that the newly developed discrete wavelet transform (DWT)-based bias correction method can outperform the quantile mapping (QM) method. In this study, wavelet coherence analysis was utilized to assess the high common powers and the multi-scale correlation between the predictors and predictand as a function of time and frequency. Thereafter, to rate the most contributing predictors based on potential periodicity, the average variance was calculated, which is named the Scaled Average (SA) measure. Consequently, WT along with Artificial Neural Network (ANN) were applied for bias correction and identifying the dominant predictors for statistical downscaling. The CAN-ESM5 data of Canadian climate models and INM-CM5 data of Russian climate models over two climatic areas of Iran with semi-arid (Tabriz) and humid (Rasht) weather were applied. The projection of future precipitation revealed that Tabriz will experience a 3.4–6.1% decrease in precipitation, while Rasht’s precipitation will decrease by 1.5–2.5%. These findings underscore the importance of refining CM data and employing advanced techniques to assess the potential impacts of climate change on regional precipitation patterns.

El Niño-Induced Drought Impacts on Reservoir Water Resources in South Africa

“…The WTC technique has frequency and phase variation analysis capabilities across time in a signal at several scales [45,46]. Since climatic variables vary over space and time, the authors of [47] suggested that WTC offers improved analyses of climate time series as these features can be identified through the frequency domain. Therefore, the Morlet Carlo wavelet and coherence analysis was used to quantify the relationship between El Niñoinduced drought and water resources for the current study.…”

Covid-19 and Uncertainty Effects on Tunisian Stock Market Volatility: Insights from GJR-GARCH, Wavelet Coherence, and ARDL

“…It is particularly valuable for handling challenges related to discreteness and non-stationarity in signals, offering a robust tool for understanding the dynamics of time-varying processes. In this part, we follow this approach (e.g., Dhanya and Gupta, 2014;Hosseini et al, 2023).…”