CTD data 2012

Conductivity temperature depth (CTD) data for lines 2, 4, and 6. This data set contains the raw .hex files and the .cnv from conductivity temperature depth (CTD) casts conducted near Barrow, AK from August 29 - September 10, 2012. Details of the latitude, longitude, date, and time are listed in the event log that is archived at this site. Date, time, position, bottom depth, and project sample line also are listed in each file. Each CTD file is named sequentially; corresponding station numbers are listed in the event log. Data were collected from the research vessel R/V Ukpik using a SeaBird (SBE) 19+ CTD sensor equipped with a Wetlabs WetStar WS3S fluorometer and Biospherical Instrument Inc. Model QSP2300 PAR/irradiance sensor sensor. No post-processing of the data was done. Fluorescence is reported as mg/m3 chlorophyll a, with conversion from volts according to factory calibrations. These values were ground-truthed to extracted chlorophyll from samples collected using Niskin bottles. The reported chlorophyll a values in the CTD files need to be corrected according to the equation: Y=0.5793X - 0.1108 for WetLabs Fluorometer values less than or equal to 10. Y=X for Wetlabs Fluometer values greater than 10. Where X is the value from the WetLabs Fluorometer and Y is the corrected value in mg/m3.

2、4、6号测线的电导率-温度-深度（Conductivity Temperature Depth, CTD）数据集。本数据集包含2012年8月29日至9月10日在阿拉斯加州巴罗（Barrow, AK）附近开展的CTD站位观测获取的原始.hex文件与.cnv格式文件。测站的纬度、经度、日期与时间信息详见本站点归档的事件日志；每个数据文件中也已记录日期、时间、站位坐标、海底深度以及项目测线信息。所有CTD数据文件均按顺序命名，对应的测站编号可在事件日志中查询。本数据集采集自"Ukpik"号科考船（R/V Ukpik），搭载的观测设备包括海鸟（SeaBird, SBE）19+型CTD传感器、Wetlabs WetStar WS3S型荧光计，以及Biospherical Instrument Inc. QSP2300型PAR/辐照度传感器。原始数据未经过任何后处理操作。荧光强度以mg/m³为单位报告叶绿素a浓度，该浓度根据工厂校准曲线由电压值转换得到。上述荧光值已通过尼斯金采水器（Niskin bottles）采集的样本提取的叶绿素浓度进行了实地验证。CTD数据文件中报告的叶绿素a浓度需按以下公式进行校正：当WetLabs荧光计读数≤10时，校正公式为Y=0.5793X−0.1108；当读数>10时，校正公式为Y=X。其中X为WetLabs荧光计的原始读数，Y为校正后的mg/m³单位叶绿素a浓度。