Abstract
HadISDH.extremes is an annually updated global gridded monthly monitoring product of wet and dry bulb temperature-based extremes indices, from January 1973 to December 2022. Data quality, including spatial and temporal stability, is a key focus. The hourly data are quality controlled. Homogeneity is assessed on monthly means and used to score each gridbox according to its homogeneity rather than to apply adjustments. This enables user-specific screening for temporal stability and avoids errors from inferring adjustments from monthly means for the daily maximum values. For general use, a score (HQ Flag) of 0 to 6 is recommended. A range of indices are presented, aligning with existing standardised indices. Uniquely, provision of both wet and dry bulb indices allows exploration of heat event character — whether it is a “humid and hot”, “dry and hot” or “humid and warm” event. It is designed for analysis of long-term trends in regional features. HadISDH.extremes can be used to study local events, but given the greater vulnerability to errors of maximum compared to mean values, cross-validation with independent information is advised.
摘要
HadISDH.extremes 是一套逐年更新的基于干/湿球温度的全球格点化逐月极端指数监测产品, 时间范围为1973年1月至2022年12月. 重点关注包括时空平稳性在内的数据质量. 对小时尺度数据作质量控制, 随后评估其在月平均尺度上的均一性并作标记. 因此, 用户可以根据数据的质量标记进行自主筛选, 以避免从每月平均值推断每日最大值的转换过程中引入新的误差. 一般而言, 建议使用标记为0–6的数据. 该数据集提供了一系列与现有标准化指数相一致的指标, 例如, 结合所提供的湿球和干球指数, 可开展“湿热”“干热”“湿暖”等热事件特征分析. 该数据是为了分析长期趋势而设计的, 同时可用于研究区域事件, 但考虑到与平均值相比, 区域事件的极值更容易受误差影响, 因此建议在研究时结合独立数据集进行交叉验证.
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Acknowledgements
This work and its contributors (Kate WILLETT) were supported by the UK–China Research & Innovation Partnership Fund through the Met Office Climate Science for Service Partnership (CSSP) China as part of the Newton Fund.
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This paper is a contribution to the 2nd Special Issue on Climate Science for Service Partnership China.
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Willett, K.M. HadISDH.extremes Part I: A Gridded Wet Bulb Temperature Extremes Index Product for Climate Monitoring. Adv. Atmos. Sci. 40, 1952–1967 (2023). https://doi.org/10.1007/s00376-023-2347-8
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DOI: https://doi.org/10.1007/s00376-023-2347-8