Ensemble estimate of global Wetland Methane (CH4) Emissions (2000-2020)

# Global Carbon Project Methane Budget Wetland Synthesis (GCP-CH4 wetland) ## 2025 Data Release ## Contact: Zhen Zhang ([e-mail] or [e-mail]) Dataset Overview: This dataset contains global wetland CH₄ flux and dynamic wetland extent outputs from ensemble simulations of multiple process-based wetland models. These data form part of the coordinated effort under the Global Carbon Project (GCP) Methane Budget Wetland Synthesis. The inundation dynamics are simulated using each model’s internal prognostic wetland dynamics module, which represents the temporal evolution of wetland extent based on surface hydrology and climate forcing. Data Description: The data are stored in a [NetCDF](https://www.unidata.ucar.edu/software/netcdf/) and have the following attributes: - Spatial extent: Entire Earth - Spatial reference system (SRS): Unprojected (geographic, WGS84)* - Spatial resolution: model-specific - Temporal extent: 2000-2020/2000-2019/2000-2016 - Temporal resolution: Monthly * For a subset of wetland models coupled with climate models, Longitude between 0 and 360 is used Additional summary files are provided in CSV format for regional aggregates by Global, Tropics (<30N), Temperate (30N-60N), Boreal (>60N). **Variables included in this release** | Variable | Description | Unit | -------------- | -----------| ----- | totflux | wetland net CH4 flux per grid cell area | kg CH4 m-2 s-1 | fw | inundation extent | fraction Data Sharing and Authorship Policy: - Please cite the following publication when using the dataset: Zhang, Z. et al. (2025). Ensemble estimates of global wetland methane emissions over 2000–2020. Biogeosciences, 22, 305–321, https://doi.org/10.5194/bg-22-305-2025, 2025. - Co-authorship for model contributors is encouraged when a model’s data play a substantial role in a specific study’s results or interpretation. - Authorship and acknowledgement decisions should be communicated early in the research process with the dataset coordinators to ensure transparency and mutual agreement. - Users should acknowledge and cite both this dataset and the primary publication listed above. Acknowledgements: We thank all contributing modeling groups and institutions participating in the GCP-CH₄ Wetland Synthesis for providing model results and scientific support.全球碳项目甲烷预算湿地综合数据集（GCP-CH4湿地数据集） 2025版数据发布 联系方式：张震（电子邮箱：[e-mail] 或 [e-mail]） 数据集概述： 本数据集收录了多套基于过程的湿地模型集合模拟所得的全球湿地甲烷（CH₄）通量与动态湿地范围输出结果，系全球碳项目（Global Carbon Project, GCP）甲烷预算湿地综合计划的协同研究成果之一。各模型通过内置的预报型湿地动态模块模拟淹没动态，该模块基于地表水文过程与气候强迫，刻画湿地范围的时间演变特征。 数据说明： 数据以网络通用数据格式（Network Common Data Form, NetCDF）存储（详见：https://www.unidata.ucar.edu/software/netcdf/），并具备以下属性： - 空间覆盖范围：全球范围 - 空间参考系统（Spatial Reference System, SRS）：无投影（地理坐标系，WGS84）* - 空间分辨率：因模型而异 - 时间覆盖范围：2000-2020、2000-2019、2000-2016 - 时间分辨率：月度 *注：对于部分与气候模型耦合的湿地模型，采用0°~360°的经度范围。 此外，本数据集还提供了按全球、热带（北纬<30°）、温带（北纬30°~60°）、寒带（北纬>60°）划分的区域汇总CSV格式摘要文件。 本次发布包含以下变量： | 变量名 | 变量说明 | 单位 | | ------ | -------- | ---- | | totflux | 单网格单元面积的湿地甲烷（CH₄）净通量 | kg CH₄ m⁻² s⁻¹ | | fw | 淹没范围占比 | 无量纲（比例） | 数据共享与署名政策： 1. 使用本数据集时，请引用以下核心文献： 张震等（2025）. 2000–2020年全球湿地甲烷排放的集合估算结果. 生物地球科学, 22卷, 305–321页, https://doi.org/10.5194/bg-22-305-2025, 2025. 2. 若某模型的数据对特定研究的结果或解读起到关键支撑作用，鼓励将该模型的贡献者列为共同作者。 3. 作者身份与致谢相关事宜应在研究初期与数据集协调团队沟通，以确保流程透明且双方达成一致。 4. 用户需同时致谢并引用本数据集与上述核心文献。 致谢： 感谢所有参与GCP-CH₄湿地综合计划的建模团队与机构提供模型结果与学术支持。