Projected changes in droughts and extreme droughts in Great Britain are strongly influenced by the choice of drought index: UKCP18-based SPI and SPEI data

Standardised Precipitation Index (SPI; McKee et al., 1993) and Standardised Precipitation Evapotranspiration Index (SPEI; Vicente-Serrano et al., 2009) computed from UKCP18 Strand 3 simulations (Met Office Hadley Centre, 2018). This data was produced for the study by Reyniers et al. (<em>in prep</em>) analysing (diferences in) drought projections using these indicators. The methodology used to produce this data can be found there if/when the paper is accepted, however do not hesitate to reach out with any further questions. Please note the RCM data was bias adjusted prior to SPI and SPEI computation. There is one file per ensemble member containing the full simulated period on a monthly time step, using aggregation periods of 1, 3, 6, 12, 24 and 36 months for the computation of SP(E)I. <strong>References</strong> McKee, T. B., Doesken, N. J., Kleist, J., et al.: The relationship of drought frequency and duration to time scales, in: Proceedings of the 8th Conference on Applied Climatology, vol. 17, pp. 179–183, Boston, 1993 Met Office Hadley Centre (2018): UKCP18 Regional Projections on a 12km grid over the UK for 1980-2080. Centre for Environmental Data Analysis, <em>date of citation</em>. https://catalogue.ceda.ac.uk/uuid/589211abeb844070a95d061c8cc7f604 Reyniers, N., Osborn, T. J., Addor, N., Darch, G.: Projected changes in droughts and extreme droughts in Great<br> Britain are strongly influenced by the choice of drought index. Hydrology and Earth System Sciences, <em>in prep. for HESS</em> Vicente-Serrano, S. M., Beguería, S., and López-Moreno, J. I.: A Multiscalar Drought Index Sensitive to Global Warming: The Standardized Precipitation Evapotranspiration Index, Journal of Climate, 23, 1696–1718, https://doi.org/10.1175/2009JCLI2909.1, 2009.标准化降水指数（Standardised Precipitation Index, SPI；McKee等，1993）与标准化降水蒸散指数（Standardised Precipitation Evapotranspiration Index, SPEI；Vicente-Serrano等，2009），基于英国气候预测18（UKCP18）第3序列（Strand 3）模拟数据（英国气象局哈德利中心，2018）计算得到。 本数据集由Reyniers等人（论文待刊）的研究衍生而来，该研究旨在利用上述两类指数开展干旱预估差异相关分析。该数据集的生成方法将在论文录用后正式刊发，如有任何后续疑问，欢迎随时联系咨询。 请注意：在计算SPI与SPEI之前，已对区域气候模式（Regional Climate Model, RCM）数据进行了偏差校正。每个集合成员对应一个数据文件，包含完整模拟时段的逐月数据；计算SP(E)I时采用了1、3、6、12、24及36个月的聚合时长。 **参考文献** McKee, T. B., Doesken, N. J., Kleist, J. 等：干旱频率与持续时长对时间尺度的响应，收录于：第8届应用气候学会议论文集，第17卷，第179–183页，波士顿，1993年 英国气象局哈德利中心（2018）：1980–2080年英国本土12km分辨率格点的UKCP18区域气候预估报告，环境数据分析中心，<引用日期>，https://catalogue.ceda.ac.uk/uuid/589211abeb844070a95d061c8cc7f604 Reyniers, N., Osborn, T. J., Addor, N., Darch, G.：英国本土干旱及极端干旱的预估变化受干旱指数选择的显著影响，《水文学与地球系统科学》，为HESS期刊待刊 Vicente-Serrano, S. M., Beguería, S., López-Moreno, J. I.：一款适用于全球变暖背景的多尺度干旱指数：标准化降水蒸散指数，《气候杂志》，第23卷，第1696–1718页，https://doi.org/10.1175/2009JCLI2909.1，2009年