High-spatial-resolution (0.0083° × 0.0083°) and long-term (1982 to 2010) monthly gridded wetland CH4 flux product for the Southeastern United States

This dataset presents monthly gridded methane emissions from subtropical freshwater wetlands across the Southeastern United States spanning from 1982 to 2010, measured in nmol m-2 s-1. Each grid cell's methane flux prediction was adjusted based on the fractional wetland extent within that cell, utilizing data from the National Wetland Inventory (NWI) and the Wetland Area and Dynamics for Methane Modeling (WAD2M) product. The dataset includes mean monthly fluxes with no adjustment for wetland area (i.e., fluxes assuming hypothetical 100% wetland cover), as well as mean monthly fluxes adjusted for wetland area based on NWI or WAD2M, along with their respective standard deviations of the daily emissions for each month. Data are provided in NetCDF4 format. Lat: 25-40°N Lon: 95-75°W Period: 198201-201012 (for "CH4_Monthly_SEUS_unweighted.nc" and "CH4_Monthly_SEUS_NWI.nc") and 200001-201012 (for "CH4_Monthly_SEUS_WAD2M.nc") Temporal resolution: Monthly Spatial resolution: 0.0083° × 0.0083° (~1 km × 1 km) Unit: nmol m-2 s-1 Fill value: -9999本数据集涵盖1982年至2010年美国东南部亚热带淡水湿地的网格化月度甲烷排放数据，单位为纳摩尔每平方米每秒（nmol m⁻² s⁻¹）。各网格单元的甲烷通量预测值均依据该网格内的湿地占比完成校正，校正所用数据来自国家湿地清单（National Wetland Inventory, NWI）与甲烷模拟用湿地面积及动态数据集（Wetland Area and Dynamics for Methane Modeling, WAD2M）。 本数据集包含两类月均甲烷通量：其一为未针对湿地面积进行校正的通量（即假设湿地覆盖率达100%的理论通量）；其二为基于NWI或WAD2M的湿地面积数据完成校正的月均通量，同时附带各月每日排放量的对应标准差。数据以NetCDF4格式存储。 ### 数据集详细参数 - 纬度范围：25°N~40°N - 经度范围：75°W~95°W - 时间周期：文件"CH4_Monthly_SEUS_unweighted.nc"与"CH4_Monthly_SEUS_NWI.nc"的时间跨度为198201-201012；文件"CH4_Monthly_SEUS_WAD2M.nc"的时间跨度为200001-201012 - 时间分辨率：月度 - 空间分辨率：0.0083° × 0.0083°（约1 km × 1 km） - 单位：nmol m⁻² s⁻¹ - 填充值：-9999