Oceanographic station data from bottle casts from the KLAMATH from Ocean Weather Station N (OWS-N) in the North Pacific Ocean 06 October 1968 to 25 October 1968 (NODC Accession 6900099)

Oceanographic station data were collected from the KLAMATH 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 06 October 1968 to 25 October 1968. 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克拉马斯号（KLAMATH）作业海域，覆盖范围包括海洋气象站N（30°00′N，140°00′W）周边1英里范围内的海域及航行途中的观测区域。数据由美国海岸警卫队（United States Coast Guard, USCG）于1968年10月6日至1968年10月25日采集完成。所有数据均由美国国家海洋数据中心（National Oceanographic Data Center, NODC）整理为NODC标准站数据II输出格式（Station Data II Output Format, SD2）。该格式的完整说明文档可通过NODC官方网站https://www.nodc.noaa.gov/General/NODC-Archive/sd2.html获取。

SD2格式存储了在离散深度层级获取的物理化学海洋学观测数据。绝大多数观测采用多瓶南森采水剖面（multi-bottle Nansen casts）或其他类型的水样采集装置完成。约5%的少量观测数据则通过电子CTD（电导率-温度-深度，conductivity-temperature-depth, CTD）或STD（盐度-温度-深度，salinity-temperature-depth, STD）记录仪获取。不过，CTD/STD数据在上报至NODC时，其深度层级与南森采水剖面数据保持统一，因此其后续处理与存储流程与南森数据完全一致。每个海洋站均附带航次相关信息，包括船舶、所属国家、研究机构、站位坐标、观测日期及时间。核心观测参数为温度与盐度，同时可能记录溶解氧、磷酸盐、总磷、硅酸盐、硝酸盐、亚硝酸盐及pH值等指标。采水作业时的气象条件，如气温、气压、风向风速、海浪状况，也可能被记录；此外还包含辅助观测数据，如水色（福尔-尤勒色级，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。每个海洋站既包含实测深度层级的原始观测数据，同时也包含经插值得到的标准深度层级数据集。