Oceanographic station data from bottle casts from the PONTCHARTRAIN from Ocean Weather Station N (OWS-N) in the North Pacific Ocean 26 May 1969 to 17 June 1969 (NODC Accession 6900878)

Oceanographic station data were collected from the PONTCHARTRAIN within a 1-mile radius of Ocean Weather Station N (3000N 14000W) and in transit. Data were collected by the United States Coast Guard (USCG) from 26 May 1969 to 17 June 1969. Data were processed by NODC to the NODC standard Station Data II Output Format (SD2). Full format description is available from NODC at www.nodc.noaa.gov/General/NODC-Archive/sd2.html.

The SD2 format contains physical-chemical oceanographic data recorded at discrete depth levels. Most of the observations were made using multi-bottle Nansen casts or other types of water samplers. A small amount (about 5 percent) were obtained using electronic CTD (conductivity-temperature-depth) or STD (salinity-temperature-depth) recorders. The CTD/STD data were reported to NODC at depth levels equivalent to Nansen cast data, however, and have been processed and stored the same as the Nansen data. Cruise information (e.g., ship, country, institution), position, date, and time, and reported for each station. The principal measured parameters and temperature and salinity , but dissolved oxygen, phosphate, total phosphorus, silicate, nitrate, nitrite, and pH may be reported. Meteorological conditions at the time of the cast (e.g., air temperature and pressure, wind, waves) may also be reported, as well as auxiliary data such as water color (Forel-Ule scale), water transparency (Secchi disk depth), and depth to bottom. Values of density (sigma-t) sound velocity, and dynamic depth anomaly are computed from measured parameters. Each station contains the measurements taken at the observed depth levels, but also includes data values interpolated to a set of standard depth levels.

本数据集的海洋站数据采集自庞恰特雷恩号（PONTCHARTRAIN），覆盖海洋气象站N（30°00′N，140°00′W）周边1英里海域及航行途中。数据由美国海岸警卫队（United States Coast Guard, USCG）于1969年5月26日至1969年6月17日采集完成，后经国家海洋数据中心（National Oceanographic Data Center, NODC）处理为NODC标准站数据II输出格式（Station Data II Output Format, SD2）。完整格式说明可通过NODC官网的https://www.nodc.noaa.gov/General/NODC-Archive/sd2.html 查询获取。

SD2格式存储了离散深度层级下记录的物理化学海洋学数据。绝大多数观测采用多瓶尼斯金采水器（multi-bottle Nansen cast）或其他类型水体采样器完成，仅约5%的观测数据通过电子电导率-温度-深度仪（conductivity-temperature-depth, CTD）或盐度-温度-深度仪（salinity-temperature-depth, STD）记录仪获取。不过，CTD/STD数据以与尼斯金采水采样数据一致的深度层级上报至NODC，其处理与存储流程与尼斯金采样数据完全一致。每个测站均附带航行信息（如船舶、所属国家、研究机构）、位置、日期与时间等元数据。核心测量参数为温度与盐度，同时也可记录溶解氧、磷酸盐、总磷、硅酸盐、硝酸盐、亚硝酸盐及pH值等指标。采样时的气象条件（如气温、气压、风速、浪况）亦可被记录，此外还可附带辅助数据，例如水色（福尔-乌勒色标，Forel-Ule scale）、水体透明度（塞氏盘深度，Secchi disk depth）及海底水深。密度（sigma-t）、声速及动态深度异常值可通过实测参数计算得到。每个测站既包含实测深度层级下的原始观测数据，同时也附带经插值得到的标准深度层级数据集。