Desert Research Institute (DRI) cloud condensation nuclei (CCN) spectra. Version 1.0

The DRI CCN (Hudson 1989) data (ASCE) provides number concentrations per centimeter cubed normalized to surface pressure; i.e., these are mixing ratios. Data are recorded with a time stamp in each row. Time differences between adjacent rows are approximately equal to the integrated time of each measurement. Data gaps are denoted by blank lines. Data gaps are caused by calibrations, cloud penetrations, or malfunctions. All data is contained in ASCII text files. Documentation is in MSWORD .doc format.

DRI CCN（Hudson 1989）数据集（美国土木工程师协会（American Society of Civil Engineers，ASCE）收录）提供了归一化至地表气压的每立方厘米数浓度，即该数据为混合比。每条记录均带有时间戳，相邻行的时间差近似等于单次测量的积分时长。数据缺失段以空行标记，其成因包括仪器校准、穿云过程或设备故障。所有数据均存储于ASCII文本文件中，配套文档采用Microsoft Word的.doc格式。