Extreme Temperature and Dew Point Events in North America

This dataset is the compilation of four different seasonally-relative extreme events for North America: extreme warm events (XWEs), extreme cold events (XCEs), extreme humid events (XHEs), and extreme dry events (XDEs). Each of these extreme events are calculated on a daily basis from 1979-2016 for 18,661 locations in North America. All extremes are relative to the time of year - essentially a seasonal curve of the 95th and 5th percentiles of the data at each location were created, and days that had 2-meter temperatures (or 2-meter dew points) that were >95th percentile were deemed XWEs (or XHEs for dew points), and days that were <5th percentile were considered XCEs (or XDEs for dew points). The article detailing the development of this dataset is: Lee, CC, Obarein O, Sheridan SC, Smith ET, Adams R. 2020. Examining trends in multiple parameters of seasonally-relative extreme temperature and dew point events across North America (Manuscript currently in peer review). Each dataset is organized as follows: The first two rows are column headers showing the latitude and longitude of the 18,661 land-based gridpoints (from the North American Regional Reanalysis dataset) in the study domain (23°N to 83°N, 46°W to 167°W). The first three columns are row headers showing date information (year, month, and day) for each day in the study period. The rest of the data are binaries (0 or 1) signifying whether each day is an extreme event day (1) or not an extreme event day (0) for each location. The four datasets (one for each type of extreme event) are in a single compressed (.zip) folder and each dataset/file is in comma separated value format (uncompressed size of each file is approximately 506MB). The research leading to the development of this dataset was supported by federal award number NA17OAR4310159, entitled “Developing extreme event climate change indicators related to human thermal comfort” from the National Oceanic and Atmospheric Administration’s Climate Program Office.本数据集汇编了北美地区四类与季节相关的极端事件，分别为极端高温事件（Extreme Warm Events, XWEs）、极端低温事件（Extreme Cold Events, XCEs）、极端潮湿事件（Extreme Humid Events, XHEs）以及极端干旱事件（Extreme Dry Events, XDEs）。所有四类极端事件均基于1979年至2016年间北美地区18661个站点的逐日观测数据计算得到。所有极端事件的判定均与所在季节挂钩：研究人员首先为每个站点构建对应季节的百分位曲线，即分别计算各站点时序数据的95th与5th百分位数；当日2米气温（或2米露点温度）高于95th百分位数时，记为极端高温事件（若为露点温度则为极端潮湿事件，XHEs）；当日2米气温（或2米露点温度）低于5th百分位数时，记为极端低温事件（若为露点温度则为极端干旱事件，XDEs）。详细阐述本数据集构建流程的文献如下：Lee CC、Obarein O、Sheridan SC、Smith ET、Adams R. 2020. 《北美地区季节相关极端气温与露点事件多参数趋势分析》（该手稿目前处于同行评审阶段）。各数据集的组织结构统一如下：前两行为列标题，标注了研究区域内18661个陆面格点（北美区域再分析数据集，North American Regional Reanalysis dataset）的经纬度信息，本次研究的区域范围为北纬23°至83°、西经46°至167°。前三列为行标题，标注了研究时段内每日的日期信息（年、月、日）。其余数据均为二值变量（0或1），用于表征对应日期是否为各站点的极端事件日：取值为1时代表当日为极端事件日，取值为0则代表非极端事件日。四类极端事件分别对应一个独立数据集，所有数据集均打包至单个压缩（.zip）文件夹中，每个数据集均采用逗号分隔值（CSV）格式存储，单文件未压缩大小约为506MB。本数据集研发相关的研究工作，得到美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）气候项目办公室的联邦资助，资助编号为NA17OAR4310159，资助项目名称为“构建与人类热舒适相关的极端事件气候变化指标”。