Abstract
Global warming upsets the environmental balance and leads to more frequent and severe climatic events. These extreme events include floods, droughts, and heatwaves. These widespread extreme events disrupt various sectors of ecosystems directly. However, among all these events, drought is one of the most prolonged climatic events that significantly destroys the ecosystem. Therefore, accurate and efficient assessment of droughts is necessary to mitigate their detrimental impacts. In recent years, several drought indices based on global climate models (GCMs) of Coupled Model Intercomparison Project Phase 6 (CMIP6) have been proposed to quantify and monitor droughts. However, each index has its advantages and limitations. As each index ensembles different models by using different statistical approaches, it is well known that the margin of error is always a part of statistics. Therefore, this study proposed a new drought index to reduce the uncertainty involved in the assessment of droughts. The proposed index named the Ridge Ensemble Standardized Drought Index (RESDI) is based on the innovative ensemble approach termed ridge parameters and distance-based weighting (RDW) scheme. And the development of this RDW scheme is based on two types of methods i.e., ridge regression and divergence-based method. In this research, we ensemble 18 different GCMs of CMIP6 using the RDW scheme. A comparative analysis of the RDW scheme is performed against the simple model average (SMA) and Bayesian model averaging (BMA) schemes at 32 locations on the Tibetan plateau. The comparison revealed that RDW has less mean absolute error (MAE) and root-mean-square error (RMSE). Therefore, the developed RESDI based on RDW is used to project drought properties under three distinct shared socioeconomic pathway (SSP) scenarios: SSP1-2.6, SSP2-4.5, and SSP5-8.5, across seven different time scales (1, 3, 7, 9, 12, 24, and 48). The projected data is then standardized by using the K-components Gaussian mixture model (K-CGMM). In addition, the study employs steady-state probabilities (SSPs) to determine the long-term behavior of drought. The outcome of this research shows that “normal drought (ND)” has the highest probability of occurrence under all scenarios and time scales.
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The data and codes used for the preparation of the manuscript are available with the corresponding author and can be provided upon request.
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Acknowledgements
The authors extend their appreciation to Taif University, Saudi Arabia, for supporting this work through project number (TU-DSPP-2024-94).
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Mahrukh Yousaf and Zulfiqar Ali conceived the idea. Abdul Baseer provided technical assistance in programming. Zulfiqar Ali supervised the writing, grammar, and overall restructuring of the paper. Olayan Albalawi and Emad E. Mahmoud, as a subject expert, significantly contributed by providing detailed consultations to address reviewer comments pertaining to statistical aspects, thereby improving the technical content. Sadia Qamar undertook the responsibility of overseeing and enhancing the language, grammar, and statistical aspects. These contributions collectively strengthened the quality and comprehensibility of the manuscript, justifying the inclusion of these authors in the revised authorship. All authors made equal contributions to the study.
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Yousaf, M., Baseer, A., Ali, Z. et al. Development of Ridge Ensemble Standardized Drought Index (RESDI) for improving drought characterization and future assessment. Environ Monit Assess 196, 614 (2024). https://doi.org/10.1007/s10661-024-12796-8
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DOI: https://doi.org/10.1007/s10661-024-12796-8