Temperature profiles from XBT casts from the BLUENOSE as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project from 19 October 1976 (NODC Accession 7700137)

Temperature profiles were collected from XBT casts from the BLUENOSE from 19 October 1976. Data were collected by the National Marine Fisheries Service (NMFS) as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project. Data were processed by NODC to the NODC standard Universal bathythermograph Output (UBT) format. Full format description is available from NODC at www.nodc.noaa.gov/General/NODC-Archive/bt.html.

The UBT format contains temperature-depth profile data obtained using expendable bathythermograph (XBT) instruments. Cruise information, position, date and time were reported for each observation. The data records are comprised of pairs of temperature-depth values. The XBT data files contain temperature values at non-uniform depths. These depths were recorded at the minimum number of points (''''inflection points'''') required to accurately define the temperature curve. Standard XBTs can obtain profiles to depths of 450 m or 760 m. Special instruments permitted measurements to 1830 m.

本数据集的温度剖面数据采集自1976年10月19日BLUENOSE号科考船投放的抛弃式温深仪（expendable bathythermograph, XBT）剖面测量数据。该数据由美国国家海洋渔业局（National Marine Fisheries Service, NMFS）作为海洋资源监测、评估与预测（Marine Resources Monitoring, Assessment and Prediction, MARMAP）项目的组成部分采集获取。美国国家海洋数据中心（National Oceanographic Data Center, NODC）已将所有数据处理为符合NODC标准的通用温深仪输出（Universal bathythermograph Output, UBT）格式。完整格式说明可通过NODC官网www.nodc.noaa.gov/General/NODC-Archive/bt.html查阅。

UBT格式存储了使用抛弃式温深仪（XBT）获取的温度-深度剖面数据。每条观测记录均附带航次信息、观测位置、观测日期与时间。数据记录由温度-深度值对构成。XBT数据文件中的温度值对应非均匀分布的深度，仅记录了精准刻画温度变化曲线所需的最少数量的“拐点（inflection points）”。标准型XBT可获取深度达450米或760米的海洋剖面，特殊定制型号则可实现1830米深度的测量。