Parameters from discrete bottle samples on a hydrographic CTD (Conductivity Temperature Depth) cast during CCE LTER P0904 student cruise, April 2009.

Hydrographic CTD (Conductivity Temperature Depth) measurements from discrete water samples are taken on individual CTD rosette casts, deployed on CCE P0904 student cruise in the Southern California region. Seawater is collected in up to 24 Niskin bottles at specific depths (up to 1000m), determined by the chlorophyll maximum and mixed layer depth as the instrument is lowered through the water column. The samples are filtered and analyzed at sea and used to assess the CTD sensor data quality. Measurements include depth, temperature, salinity, density (sigma theta), oxygen, O2 saturation, PAR (radiation, surface radiation and irradiance), fluorescence and transmission. Salinity checks are performed with a salinometer back at the lab.

本数据集包含离散水样的水文温盐深仪（CTD, Conductivity Temperature Depth）测量数据，采集自单次温盐深仪采水罗塞塔架下放作业，布放于南加州海域的CCE P0904学生科考航次。当仪器沿水体柱向下投放时，依据叶绿素最大值层与混合层深度确定采样深度，最大采样深度可达1000米，单次最多可通过24个尼斯金采水瓶采集不同深度的海水样本。采集的水样将在现场完成过滤与分析，用于评估温盐深仪传感器的数据质量。本次测量涵盖深度、温度、盐度、密度（sigma theta，位势密度）、溶解氧、氧饱和度、光合有效辐射（PAR，含表面辐射与辐照度）、荧光强度与透射率。后续将在实验室使用盐度计完成盐度复核检测。