SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange V004

The Level-4 (L4) carbon product (SPL4CMDL) provides global gridded daily estimates of net ecosystem carbon (CO2) exchange derived using a satellite data based terrestrial carbon flux model informed by the following: Soil Moisture Active Passive (SMAP) L-band microwave observations, land cover and vegetation inputs from the Moderate Resolution Imaging Spectroradiometer (MODIS), Visible Infrared Imaging Radiometer Suite (VIIRS), and the Goddard Earth Observing System Model, Version 5 (GEOS-5) land model assimilation system. Parameters are computed using an Earth-fixed, global cylindrical 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) projection.

四级（L4）碳产品（SPL4CMDL）可提供全球网格化逐日净生态系统碳（CO₂）交换量估算结果，其基于卫星数据驱动的陆地碳通量模型生成，该模型的约束依据包括：土壤湿度主动被动（SMAP）L波段微波观测数据、中分辨率成像光谱仪（MODIS）、可见光红外成像辐射仪套件（VIIRS）提供的土地覆盖与植被输入数据，以及戈达德地球观测系统模型第5版（GEOS-5）陆地模型同化系统。数据集参数采用地球固定的全球圆柱9公里等面积可缩放地球网格第2.0版（EASE-Grid 2.0）投影进行计算。