HIPPO-4 Airborne Oxygen Instrument. Version 2.0

The NCAR Airborne Oxygen Instrument (AO2) was mounted on the NCAR GV during the HIPPO-4 project. The submitted AO2 data are in 1 flat ascii text file per flight. Each file contains running 10-second medians (of the original ~ 2.5-second data) at 1 Hz matching the times in the RAF data files. The files are in NASA Ames 1001 format, with a final comment line of variable names (UT CO2_AO2orig O2_AO2orig APO_AO2orig CO2_AO2 O2_AO2 APO_AO2), spaces separating columns, and 9999.99 for missing data. The reported times correspond to when the air entered the inlet. This instrument measures O2/N2 ratio as well as CO2 concentration.

NCAR机载氧气分析仪（Airborne Oxygen Instrument, AO2）在HIPPO-4项目期间被搭载于NCAR GV研究机上。本次提交的AO2数据集按单次飞行架次存储为单个纯ASCII文本文件。每个文件包含由原始约2.5秒采样频率的数据计算得到的滑动10秒中值，输出频率为1赫兹，其时间戳与RAF数据文件中的时间戳完全匹配。该批文件采用NASA艾姆斯1001格式存储，文件末尾的注释行包含变量名列表：UT、CO2_AO2orig、O2_AO2orig、APO_AO2orig、CO2_AO2、O2_AO2、APO_AO2，列间以空格分隔，缺失数据以9999.99标记。所记录的时间戳对应空气进入采样进气口的时刻。该仪器可同时测量氧气与氮气的比值以及二氧化碳浓度。