Oceanographic station data from bottle and CTD casts from the MINNETONKA from Ocean Weather Station N (OWS-N) in the North Pacific Ocean from 01 August 1973 to 23 August 1973 (NODC Accession 7400095)

Oceanographic station data were collected from the MINNETONKA 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 01 August 1973 to 23 August 1973. 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.

本数据集为海洋站观测数据，采集自“明尼通卡”号（MINNETONKA），观测范围覆盖N号海洋气象站（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，缩写USCG）于1973年8月1日至1973年8月23日采集完成，后由国家海洋数据中心（National Oceanographic Data Center，缩写NODC）处理为NODC标准站数据II输出格式（Station Data II Output Format，缩写SD2）。完整格式说明可通过NODC官方网址www.nodc.noaa.gov/General/NODC-Archive/sd2.html获取。

SD2格式存储了离散深度层记录的物理化学海洋学观测数据。绝大多数观测采用多瓶式南森采水作业或其他类型水体采样器完成，仅约5%的观测数据由电子电导率-温度-深度仪（conductivity-temperature-depth，缩写CTD）或盐度-温度-深度记录仪（salinity-temperature-depth，缩写STD）获取。需说明的是，CTD/STD数据上报至NODC时的深度层级与南森采水作业的深度层级保持一致，因此其处理与存储方式与南森采样数据完全相同。每个观测站均记录有航行作业信息（如船舶、所属国家及机构）、站位坐标、观测日期与时间。主要观测参数为温度与盐度，同时可能包含溶解氧、磷酸盐、总磷、硅酸盐、硝酸盐、亚硝酸盐及pH值等数据。观测作业当时的气象条件（如气温、气压、风向风速、海浪情况）也可能被记录，此外还可能包含水体颜色（福勒-尤勒色标，Forel-Ule scale）、水体透明度（塞氏盘深度，Secchi disk depth）及海底深度等辅助数据。研究人员可通过实测参数计算得到密度距平（sigma-t）、声速及动态深度异常等指标。每个观测站既包含实测深度层的观测数据，也包含插值至标准深度层级的数据集。