HadEX3: Global land-surface climate extremes indices v3.0.1 (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'). In September 2020, a user identified some issues in the DTR and TN90p (61-90) indices. These were found to have arisen from erroneous values in a few stations which were not picked up by any quality control checks. These stations were noted on the bad list and these two indices re-run, hence v3.0.1.

HadEX3是一款地表气候极端指数数据集，采用1.875×1.25经纬度网格布设。该数据集包含29项气候极端指数，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）研发。研究依托每日降水、最高气温与最低气温观测数据，对每个气象站点计算得到上述指数。随后将每日观测数据与计算生成的指数进行质量控制、整合，最终得到覆盖1901年至2018年（含首尾年份）的NetCDF格式网格化数据集。数据集的空间覆盖范围取决于各时间点的有效站点数量，以及各指数对应站点间的空间相关结构。其空间覆盖范围在数据集初期最低，至1960年左右趋于平稳后逐步提升，2010年后则略有下降。所有指数均提供年际尺度数据，其中部分子集还支持月度尺度输出。部分指数需借助参考时段确定阈值，针对这类指数，本数据集提供两个版本：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（两类参考期已通过文件名中的'ref-6190'或'ref-8110'进行标识）。2020年9月，有用户反馈DTR与TN90p（61-90）指数存在异常。经排查，该问题源于少数未被现有质量控制流程检出的站点数据错误。相关站点已被纳入无效站点列表，随后重新计算了这两类指数，即版本v3.0.1。

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，包含29个指数，基于1901-2018年的每日温度和降水数据计算，以网格形式提供。数据集经过质量控制，部分指数提供月度数据，并针对v3.0.1版本修正了部分数据问题。