Methane Flux

Methane (CH4) flux is the net rate of methane exchange between an ecosystem and the atmosphere. Data of this variable were generated by the USGS LandCarbon project using the General Ensemble Biogeochemical Modeling System (GEMS) based on modelled Land-Use/Land-Cover data and selected IPCC emission scenarios. The spatial extent is the conterminous United States and the temporal extent is from 1992 through 2050. Units of measure are expressed in g CH4/m2/yr. Data are projected to Albers Equal Area in the NAD83 datum at a resolution of 2000 meters and are spatially gridded in GeoTiff format.

甲烷（CH₄）通量是生态系统与大气之间甲烷交换的净速率。该变量的数据由美国地质调查局（USGS）陆地碳项目（LandCarbon Project）生成，基于模拟得到的土地利用/土地覆被数据与选定的政府间气候变化专门委员会（IPCC）排放情景，通过通用集合生物地球化学建模系统（General Ensemble Biogeochemical Modeling System，GEMS）完成构建。数据集的空间覆盖范围为美国本土连续区域，时间跨度为1992年至2050年。计量单位为克甲烷每平方米每年（g CH₄/m²/yr）。数据采用NAD83基准面下的阿尔伯斯等面积（Albers Equal Area）投影方式，分辨率为2000米，并以GeoTiff格式进行空间网格化存储。