AIRS/Aqua L3 Monthly Standard Physical Retrieval (AIRS+AMSU+HSB) 1 degree x 1 degree V006 (AIRH3STM) at GES DISC

The Atmospheric Infrared Sounder (AIRS) is a grating spectrometer (R = 1200) aboard the second Earth Observing System (EOS) polar-orbiting platform, EOS Aqua. In combination with the Advanced Microwave Sounding Unit (AMSU) and the Humidity Sounder for Brazil (HSB), AIRS constitutes an innovative atmospheric sounding group of visible, infrared, and microwave sensors. This product is similar to AIRX3STM. However, it contains science retrievals that use the Humidity Sounder for Brazil (HSB). Because the HSB instrument lived only from September 2002 through January 2003 when it terminally failed, the data set covers these five months only. The AIRS Level 3 Monthly Gridded Retrieval Product contains standard retrieval means, standard deviations and input counts. Each file covers a calendar month. The mean values are simply the arithmetic means of the daily products, weighted by the number of input counts for each day in that grid box. The geophysical parameters have been averaged and binned into 1 x 1 grid cells, from -180.0 to +180.0 deg longitude and from -90.0 to +90.0 deg latitude. For each grid map of 4-byte floating-point mean values there is a corresponding 4-byte floating-point map of standard deviation and a 2-byte integer grid map of counts. The counts map provides the user with the number of points per bin that were included in the mean and can be used to generate custom multi-day maps from the daily gridded products. The thermodynamic parameters are: Skin Temperature (land and sea surface), Air Temperature at the surface, Profiles of Air Temperature and Water Vapor, Tropopause Characteristics, Column Precipitable Water, Cloud Amount/Frequency, Cloud Height, Cloud Top Pressure, Cloud Top Temperature, Reflectance, Emissivity, Surface Pressure, Cloud Vertical Distribution. The trace gases parameters are: Total Amounts and Vertical Profiles of Carbon Monoxide, Methane, and Ozone. The actual names of the variables in the data files should be inferred from the Processing File Description document.

大气红外探测器（Atmospheric Infrared Sounder, AIRS）是搭载于第二代地球观测系统（Earth Observing System, EOS）极轨平台EOS Aqua上的光栅光谱仪（分辨率R=1200）。该设备与先进微波探测单元（Advanced Microwave Sounding Unit, AMSU）及巴西湿度探测器（Humidity Sounder for Brazil, HSB）协同工作，共同构成一套创新的可见光、红外及微波大气探测传感器组。
本数据集产品与AIRX3STM类似，但包含了依托巴西湿度探测器（HSB）完成的科学反演产品。由于HSB仅在2002年9月至2003年1月期间服役并最终失效，本数据集仅覆盖这五个月的数据。
AIRS三级月度网格化反演产品包含标准反演均值、标准差及有效输入计数。每个文件对应一个自然月。均值为对应网格框内每日产品的算术平均值，且以每日的有效输入计数作为权重进行加权计算。
地球物理参数已被平均并网格化至1°×1°的网格单元，经度范围为-180.0°至+180.0°，纬度范围为-90.0°至+90.0°。针对每张4字节浮点型均值网格图，均对应一张4字节浮点型标准差网格图，以及一张2字节整型有效计数网格图。该计数网格图可向用户提供每个网格箱内参与均值计算的样本点数，支持用户基于每日网格化产品自定义生成多日合成网格图。
数据集包含的热力学参数包括：地表（陆地与海洋）皮肤温度、地表气温、气温与水汽垂直廓线、对流层顶特征、大气柱可降水量、云量/云出现频率、云高、云顶气压、云顶温度、反照率、发射率、地表气压、云垂直分布。
痕量气体参数包括：一氧化碳、甲烷与臭氧的总含量及垂直廓线。数据文件内变量的实际命名需从《处理文件说明》（Processing File Description）文档中推断得出。