Temperature profiles from XBT casts from the GULF SHIPPER as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project from 12 February 1973 to 25 March 1973 (NODC Accession 7300433)

Temperature profiles were collected from XBT casts from the GULF SHIPPER from 12 February 1973 to 25 March 1973. Data were collected by the Lykes Brothers Lines 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 permit measurements to 1830 m.

1973年2月12日至1973年3月25日期间，研究人员从“海湾货轮（GULF SHIPPER）”上通过投弃式温深仪（expendable bathythermograph, XBT）投放作业获取了温度廓线数据。该数据由莱克兄弟航运公司（Lykes Brothers Lines）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。美国国家海洋数据中心（National Oceanographic Data Center, NODC）将这批数据处理为符合NODC标准的通用温深仪输出格式（Universal Bathythermograph Output, UBT）。完整格式说明可从NODC获取，网址为www.nodc.noaa.gov/General/NODC-Archive/bt.html。

UBT格式包含使用投弃式温深仪（XBT）获取的温深廓线数据。每份观测记录均包含航次信息、站位坐标、观测日期与时间。数据记录由温度-深度值对组成。XBT数据文件包含非等深测点的温度值，这些深度测点以准确刻画温度曲线所需的最少点数（拐点）进行记录。

标准型XBT可获取深度达450米或760米的温深廓线，特殊型号仪器则可实现1830米深度的测量。