Gridded U.S. Anthropogenic Methane Greenhouse Gas Inventory (gridded GHGI)

**** THE FOLLOWING DATA HAVE NOT BEEN PEER-REVIEWED **** *** This repository will be updated upon peer-review and final publication of an associated manuscript. For questions and answers about previous versions of this dataset, please visit previously published Zenodo records: https://zenodo.org/records/8367082 *** About The gridded U.S. anthropogenic methane greenhouse gas inventory (gridded GHGI) includes spatially and temporally resolved (gridded) maps of annual anthropogenic methane emissions (0.1°×0.1°) for the contiguous United States (CONUS). Total gridded methane emissions for each source sector are consistent with national annual U.S. anthropogenic methane emissions reported in the Inventory of U.S. Greenhouse Gas Emissions and Sinks (U.S. GHGI). This repository is an update to the gridded GHGI version 2, previously described in Maasakkers, et al., 2023 and available at: https://zenodo.org/records/8367082 This work was led by RTI International, funded by contract number: 68HERH19D0030/68HERH24F0030. This repository contains the follow data: Gridded GHGI v3 (2 file types). Gridded annual U.S. anthropogenic methane emissions for 2012-2022 for 34 source categories. This dataset is developed to be consistent with the national U.S. GHGI published in April 2024 (U.S. EPA, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990 - 2022. U.S. Environmental Protection Agency, 2024, EPA 430-R-24-004, https://www.epa.gov/system/files/documents/2024-04/us-ghg-inventory-2024-main-text_04-18-2024.pdf).This dataset includes 2 file types: a. Annual methane emission fluxes for 34 inventory source categories. Files contain one year of emissions per source category and include a time dimension variable to make the data suitable (COARDS-compliant) for atmospheric models.(Dimensions: longitude x latitude x time; units: molecules CH­4 cm-2 s-1): - Gridded_GHGI_Methane_v3_YYYY.ncb. Monthly emission scaling factors for inventory source categories with interannual variability (see 'Data Details' below). To use these factors to calculate absolute monthly methane emission fluxes, multiply the scaling factors for each relevant source category by the corresponding emission fluxes in the annual flux files. (Dimensions: longitude x latitude x month; units: dimensionless): - Gridded_GHGI_Methane_v3_Monthly_Scale_Factors_YYYY.nc**** 以下数据尚未经过同行评议 **** *** 本仓库将在相关稿件完成同行评议并正式发表后更新。若需查询本数据集过往版本的相关问题，请访问已发布的Zenodo记录：https://zenodo.org/records/8367082 *** ## 数据集概况 网格化美国人为源甲烷温室气体清单（gridded GHGI）包含美国本土（CONUS）逐年、空间分辨率为0.1°×0.1°的人为源甲烷排放网格化图谱。各排放源类别的网格化甲烷排放总量，与《美国温室气体排放与汇清单》（U.S. GHGI）中公布的美国全国年度人为源甲烷排放量保持一致。 本仓库为网格化GHGI第二版的更新版本，第二版此前已在Maasakkers等人2023年的研究中进行说明，可通过以下链接获取：https://zenodo.org/records/8367082 本工作由RTI国际研究院主导开展，资助合同编号为：68HERH19D0030/68HERH24F0030。 本仓库包含以下数据： ### 网格化GHGI第三版（共2类文件格式） 包含2012-2022年美国本土34个排放源类别的逐年人为源甲烷网格化排放数据。本数据集与2024年4月发布的《美国温室气体排放与汇清单：1990-2022》（U.S. EPA，美国环境保护署，2024年，EPA 430-R-24-004，详见链接：https://www.epa.gov/system/files/documents/2024-04/us-ghg-inventory-2024-main-text_04-18-2024.pdf）中的全国官方清单保持一致。 本数据集包含2种文件类型： a. 34个清单排放源类别的年度甲烷排放通量文件。每个文件对应单一年份、单一排放源类别的排放量，且包含时间维度变量，以适配大气模型（符合COARDS标准）。（维度：经度×纬度×时间；单位：甲烷分子·厘米⁻²·秒⁻¹）： - Gridded_GHGI_Methane_v3_YYYY.nc b. 具备年际变化特征的清单排放源类别月度排放缩放因子文件（详见下文「数据详情」部分）。若需通过该因子计算绝对月度甲烷排放通量，需将各相关排放源类别的缩放因子与年度通量文件中对应排放通量相乘。（维度：经度×纬度×月份；单位：无量纲）： - Gridded_GHGI_Methane_v3_Monthly_Scale_Factors_YYYY.nc