Temperature profiles from XBT casts from the MARINE EVANGELINE as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project from 25 August 1981 to 26 August 1981 (NODC Accession 8100678)

Temperature profiles were collected from XBT casts from the MARINE EVANGELINE from 25 August 1981 to 26 August 1981. 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 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1981年8月25日至26日期间，由“海洋福音号（MARINE EVANGELINE）”搭载的抛弃式温深计（expendable bathythermograph, XBT）投放观测获取。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）项目的一部分采集获得，后由美国国家海洋数据中心（National Oceanographic Data Center, NODC）处理为通用温深计输出（Universal Bathythermograph Output, UBT）标准格式。完整的格式说明可从NODC官网的https://www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。
通用温深计输出（UBT）格式包含通过抛弃式温深计（XBT）仪器获取的温深剖面数据。每条观测记录均附带航次信息、观测位置、日期与时间。数据记录由多组温深数值对构成。XBT数据文件中的温度数值对应非均匀分布的深度，这些深度以精准刻画温度曲线所需的最少点数——即拐点（inflection points）——进行记录。标准型XBT可获取的剖面最大深度为450米或760米，特殊定制仪器则可将测量深度拓展至1830米。