Atmospheric Ammonia (NH3) total columns from the FY-4A Geostationary Interferometric Infrared Sounder (GIIRS)

This dataset includes the ammonia (NH3) total columns (in molecules cm^-2) obtained from the FY-4A Geostationary Interferometric Infrared Sounder (GIIRS) satellite observations between November 2019 and October 2020. It also includes a an NH3 uncertainty estimate and a cloud flag. Data has been set to NaN when clouds are detected or in the case of poor measurement sensitivity. Description of the product and retrieval method can be found in Clarisse et al. (2021).本数据集包含2019年11月至2020年10月期间，由风云四号A星（FY-4A）静止轨道干涉式红外探测仪（Geostationary Interferometric Infrared Sounder，GIIRS）卫星观测反演得到的氨（NH3）总柱量，单位为分子·厘米⁻²。本数据集同时附带氨（NH3）不确定性估计值与云标记。当检测到云覆盖或测量灵敏度不足时，对应数据将被赋值为非数值（NaN）。该产品与反演方法的详细说明可参见Clarisse等人（2021）的研究成果。