Temperature profiles from XBT casts from the SANTA CRUZ as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project from 17 May 1974 to 12 June 1974 (NODC Accession 7400570)

Temperature profiles were collected from XBT casts from the SANTA CRUZ from 17 May 1974 to 12 June 1974. Data were collected by Grace Prudential 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 permitted measurements to 1830 m.

1974年5月17日至6月12日期间，从“圣克鲁兹号（SANTA CRUZ）”搭载的投弃式温深仪（expendable bathythermograph, XBT）投放剖面获取了温度剖面数据。该数据由格雷斯保诚航运公司（Grace Prudential Lines）作为海洋资源监测、评估与预测（Marine Resources Monitoring, Assessment and Prediction, MARMAP）项目的组成部分完成采集。美国国家海洋数据中心（National Oceanographic Data Center, NODC）将数据标准化处理为通用温深仪输出（Universal bathythermograph Output, UBT）格式。完整的格式说明可从美国国家海洋数据中心官网的以下网址获取：www.nodc.noaa.gov/General/NODC-Archive/bt.html。

通用温深仪输出（UBT）格式存储了通过投弃式温深仪（XBT）采集的温度-深度剖面数据。每条观测记录均包含航次信息、观测位置、日期及时间。数据记录由温度与深度的数值对构成。XBT数据文件中的温度值对应非均匀分布的深度测点，这些测点仅选取了精准刻画温度变化曲线所需的最少数量，即拐点（inflection points）。

标准型投弃式温深仪可获取深度达450米或760米的温度剖面，特殊定制型号的仪器则可实现1830米深度的测量。