ISIMIP3b population input data

This dataset contains the national and gridded historical population data for ISIMIP3b (Frieler et al. 2024, in prep.). Estimates are available for total as well as urban and rural population counts.<br>With version 1.1, we provide gridded population data, that is based on HYDE v3.3 (private communication with K. Klein Goldewijk, to be published) rescaled to the national population counts from the 2019 revision of the UN World Population Prospects (WPP) database (United Nations, 2019). Just like the original dataset we provide total, rural and urban population per grid cell. The data for the historical period is identical to the corresponding ISIMIP3a data, adjusted for the different start and end years.<br>Version 1.2 extends the national data to 1850. The additional years were derived from the gridded historic population map by means of the fractional ISIMIP country mask.<br>Note: Combining time series of the gridded population from ISIMIP3b with the historical gridded population data provided under ISIMIP3a needs to be done with caution: On the grid-cell level inconsistencies in the transition between the observational period and the projections (2015-2016) arise, due to differences in the spatial population distribution in HYDE v3.3 and the observational basis dataset (Gridded Population of the World version 3) used for the NCAR projections.

本数据集包含针对ISIMIP3b（Frieler等人，2024，待刊）的国家级与网格化历史人口数据，可提供总人口、城镇人口与乡村人口的统计估算值。
在1.1版本中，本数据集提供基于HYDE v3.3（与K. Klein Goldewijk的私人通信，待刊）的网格化人口数据，该数据已被重新缩放至联合国《世界人口展望（World Population Prospects, WPP）》2019年修订版数据集（联合国，2019）中的国家级人口统计数据。与原始数据集一致，本数据集为每个网格单元提供总人口、乡村人口与城镇人口数据。
历史时段的数据与对应的ISIMIP3a数据集完全一致，仅针对不同的起止年份进行了调整。
1.2版本将国家级人口数据的时间范围延展至1850年，新增年份的人口数据通过比例化ISIMIP国家掩码（fractional ISIMIP country mask）从网格化历史人口地图中提取得到。
注意事项：将ISIMIP3b的网格化人口时间序列与ISIMIP3a提供的历史网格化人口数据进行合并时需谨慎：由于HYDE v3.3与美国国家大气研究中心（National Center for Atmospheric Research, NCAR）预测所用的基础观测数据集——《世界网格化人口第三版（Gridded Population of the World version 3, GPWv3）》在空间人口分布上存在差异，观测时段与预测时段（2015-2016年）的过渡阶段在网格单元层面会出现不一致性。

搜集汇总

背景与挑战

背景概述

该数据集为ISIMIP3b项目提供历史和网格化的人口数据，包括总人口、城市和农村人口数量，基于HYDE v3.3和UN World Population Prospects数据库，并提供了国家级别和网格级别的数据。