HadEX3: Global land-surface climate extremes indices v3.0.4 (1901-2018)

HadEX3 is a land-surface dataset of climate extremes indices available on a 1.875 x 1.25 longitude-latitude grid. These 29 indices have been developed by the World Meteorological Organization (WMO) Expert Team on Climate Change Detection and Indices (ETCCDI). Daily precipitation, as well as maximum and minimum temperature observations, are used to calculate these indices at each station. The daily data, as well as indices, have been supplied, quality controlled and combined to make a gridded set of NetCDF files covering 1901-2018 (inclusive). Spatial coverage is determined by the number of stations present at each time point as well as the spatial correlation structure between the stations for each index. The spatial coverage is lowest at the beginning of the dataset, rising until around 1960 where it plateaus, and then declines slightly after 2010. All indices are available as annual quantities, with a subset also available on a monthly basis. A number of the indices use a reference period to determine thresholds. For these, we provide two versions, one set using 1961-1990 and another using the more recent 1981-2010 (these reference periods have been indicated in the file name as either 'ref-6190' or 'ref-8110'). Version 3.0.4 was added due to an error in how the Rx1day and Rx5day data were being handled for one of the West African data sources. More details can be found in the HadEX3 blog under 'Details/Docs' tab. Additionally, an extension to HadEX3, comprising additional indices recommended by the WMO Expert Team on Sector-specific Climate Indices (ET-SCI), has been produced. These data are available in a separate dataset connected to this record, marked as supplemental to this dataset.HadEX3是一套地表气候极端指数数据集，采用1.875°×1.25°的经纬度网格格式。该数据集包含29项指数，由世界气象组织（World Meteorological Organization，WMO）气候变化检测与指数专家小组（Expert Team on Climate Change Detection and Indices，ETCCDI）制定。研究人员利用每日降水、最高与最低气温观测数据，在各气象站点处计算得到上述指数。随后将每日观测数据与计算得到的指数进行质量控制、整合，生成覆盖1901年至2018年（含首尾年份）的网格化NetCDF文件集。 空间覆盖范围由每个时间点的有效站点数量，以及各指数对应的站点间空间相关结构共同决定。数据集的空间覆盖范围在初始阶段最低，至1960年左右趋于平稳，随后在2010年后略有缩减。 所有指数均以年际尺度数据形式提供，其中部分子集还支持月度尺度发布。部分指数需借助参考时段确定阈值，针对此类指数提供两个版本：一组采用1961-1990年作为参考时段，另一组采用更近期的1981-2010年参考时段（两类参考时段已在文件名中分别标记为'ref-6190'与'ref-8110'）。 由于某一西非数据源的Rx1day与Rx5day数据处理存在错误，故推出了3.0.4版本。更多细节可参阅HadEX3博客的“Details/Docs”栏目。 此外，本数据集还延伸推出了包含世界气象组织（World Meteorological Organization，WMO）专门领域气候指数专家小组（Expert Team on Sector-specific Climate Indices，ET-SCI）推荐的新增指数的扩展数据集。该扩展数据作为本数据集的补充内容，收录于本记录关联的独立数据集中。

搜集汇总

背景与挑战

背景概述

HadEX3是一个全球陆地表面气候极端指数数据集，覆盖1901年至2018年，提供基于WMO ETCCDI定义的29个指数，这些指数使用每日降水、最高和最低温度数据计算，并以1.875 x 1.25度的网格格式存储为NetCDF文件。数据集的空间覆盖随时间变化，在1960年左右达到高峰后略有下降，所有指数均提供年度数据，部分有月度版本，并基于两个参考时期（1961-1990和1981-2010）提供两个版本，且包含针对数据错误的修复和扩展指数。