Temperature profiles from XBT casts from the DELTA NORTE as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project from 20 September 1975 to 24 October 1975 (NODC Accession 7501108)

Temperature profiles were collected from XBT casts from the DELTA NORTE from 20 September 1975 to 24 October 1975. Data were collected by the Delta Steamship Co. 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 either 450 or 760 m. Special instruments permitted measurements to be obtained to 1830 m.

本数据集的温度剖面数据采集自1975年9月20日至1975年10月24日期间，“德尔塔诺特号（DELTA NORTE）”开展的投弃式温深仪（Expendable Bathythermograph，简称XBT）投放作业。该数据由德尔塔航运公司（Delta Steamship Co.）作为海洋资源监测、评估与预测（Marine Resources Monitoring, Assessment and Prediction，简称MARMAP）项目的组成部分完成采集。后续由美国国家海洋数据中心（National Oceanographic Data Center，简称NODC）将数据处理为符合其规范的通用温深仪输出（Universal Bathythermograph Output，简称UBT）格式。完整的格式说明文档可通过美国国家海洋数据中心（NODC）的官方网址www.nodc.noaa.gov/General/NODC-Archive/bt.html查阅获取。
通用温深仪输出（UBT）格式包含通过投弃式温深仪（XBT）获取的温度-深度剖面数据。每份观测记录均涵盖航次信息、站位坐标、观测日期与时间。数据记录由温度-深度值对构成。XBT数据文件存储了非等间距深度下的温度数值，这些深度点仅记录了精准刻画温度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米的温度剖面，特殊定制的XBT设备则可实现最大深度1830米的测量。