Temperature profiles from XBT casts from the EVERGREEN and other platforms as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project from 31 March 1978 to 19 August 1978 (NODC Accession 7800707)

Temperature profiles were collected from XBT casts from the EVERGREEN and other platforms from 31 March 1978 to 19 August 1978. 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1978年3月31日至1978年8月19日期间，由"EVERGREEN"号及其他作业平台投放的投弃式深水测温仪（expendable Bathythermograph, XBT）所获取的观测剖面。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）项目的一部分采集完成，后由美国国家海洋数据中心（National Oceanographic Data Center, NODC）处理为NODC标准通用深水测温仪输出（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获取。

UBT格式存储了通过投弃式深水测温仪（expendable Bathythermograph, 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点，这些深度点以准确刻画温度曲线所需的最少数量的拐点（inflection points）进行记录。标准型XBT可获取深度达450米或760米的温度剖面，特殊定制仪器则可实现深度达1830米的剖面测量。