ISIMIP3 land-sea masks

The Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) provides a framework for the collation of a consistent set of climate impact data across sectors and scales. It also provides a unique opportunity for considering interactions between climate change impacts across sectors through consistent scenarios. The ISIMIP3a part of the third simulation round is dedicated to i) impact model evaluation and improvement and ii) detection and attribution of observed impacts according to the framework of IPCC AR5 Working Group II Chapter 18. To this end all simulations are driven by observed socio-economic information combined with either observed (factual) climate data or a detrended (counterfactual) version of the observed climate allowing for the generation of a “no climate change” baseline. The ISIMIP3b part of the third simulation round is dedicated to a quantification of climate-related risks at different levels of global warming and socio-economic change. ISIMIP3b group I simulations are based on historical climate change as simulated in CMIP6 combined with observed historical socio-economic forcing. ISIMIP3b group II simulations are based on climate change according to the CMIP6 future projections combined with socio-economic forcings fixed at 2015 levels. ISIMIP3b group III simulations additionally account for future changes in socio-economic forcing. This dataset contains several land-sea masks to be used for ISIMIP3a and ISIMIP3b. The masks are binary on a 0.5° x 0.5° latitude-longitude grid. The main file (labeled landseamask) is the land-sea mask of the W5E5 dataset (Lange, 2019; Cucchi et al., 2020). Over all grid cells marked as land by this mask, all climate data that are based on W5E5 (GSWP3-W5E5 as well as climate data bias-adjusted using W5E5) represent climate conditions over land. The mask is also provided in a version without Antarctica. In addition, the generic land-sea mask from ISIMIP2b is provided to be used for global water simulations in ISIMIP3. It marks more grid cells as land than landseamask.

跨部门影响模型比较计划（Inter-Sectoral Impact Model Intercomparison Project，ISIMIP）提供了一套框架，用于整合不同部门、不同尺度下的一致性气候影响数据集。同时，其也为通过统一情景探讨跨部门气候变化影响间的相互作用提供了独特机遇。
第三轮模拟的ISIMIP3a部分，聚焦于两项任务：i）影响模型的评估与优化；ii）依据政府间气候变化专门委员会（Intergovernmental Panel on Climate Change, IPCC）第五次评估报告（Assessment Report 5, AR5）第二工作组第十八章的框架，对已观测到的气候影响开展检测与归因研究。为达成这一目标，所有模拟均以观测得到的社会经济信息为驱动，该信息或结合实测（实际）气候数据，或结合观测气候序列的去趋势（反事实）版本，由此可生成“无气候变化”的基准情景。
第三轮模拟的ISIMIP3b部分，旨在量化不同全球增温水平与社会经济变化情境下的气候相关风险。
ISIMIP3b第一组模拟基于耦合模式比较计划第六阶段（Coupled Model Intercomparison Project Phase 6, CMIP6）模拟的历史气候变化，结合观测得到的历史社会经济强迫数据。
ISIMIP3b第二组模拟基于耦合模式比较计划第六阶段（CMIP6）的未来气候投影，同时将社会经济强迫固定至2015年水平。
ISIMIP3b第三组模拟则额外纳入了社会经济强迫的未来变化情况。
本数据集包含多款适用于ISIMIP3a与ISIMIP3b的海陆掩膜产品。这些掩膜基于0.5°×0.5°的经纬度网格构建，采用二值格式。主文件（命名为landseamask）为W5E5数据集的海陆掩膜（Lange, 2019; Cucchi et al., 2020）。在该掩膜标记为陆地的所有网格单元中，所有基于W5E5的气候数据（包括GSWP3-W5E5以及采用W5E5进行偏差校正的气候数据）均代表陆地表面的气候状态。该掩膜还提供了剔除南极洲的版本。
此外，本数据集还附带ISIMIP2b的通用海陆掩膜，用于ISIMIP3中的全球水文模拟，其标记为陆地的网格单元数量多于landseamask。

搜集汇总

背景与挑战

背景概述

该数据集是ISIMIP3项目中的陆地-海洋掩膜集合，用于支持跨部门气候影响模拟，基于0.5° x 0.5°经纬度网格提供二进制掩膜数据。主要掩膜基于W5E5数据集，标识陆地网格以辅助气候数据分析，并包含不含南极洲的版本及ISIMIP2b的通用掩膜，适用于全球水模拟。数据集文件小巧，发布于2020年，旨在为气候影响研究提供一致的地理条件输入。