Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC RELIANCE in the East Coast - US/Canada in support of the Integrated Global Ocean Services System (IGOSS) project from 05 December 1975 to 08 December 1975 (NODC Accession 7600023)

XBT data were collected from the USCGC RELIANCE in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the US Coast Guard (USCG) from 05 December 1975 to 08 December 1975. 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 file format is used for temperature-depth profile data obtained using expendable bathythermograph (XBT) instruments. Standard XBTs can obtain profiles at depths of about 450 or 760 m. With special instruments, measurements can be obtained to 1830 m. Cruise information, position, date, and time are reported for each observation. The data record comprises pairs of temperature-depth values. Unlike the MBT data file, in which temperature values are recorded at uniform 5m intervals, the XBT Data File contains temperature values at non-uniform depths. These depths are at a minimum number of points ("inflection points") required to record the temperature curve to an acceptable degree of accuracy. On output, however, the user may request temperature values either at inflection points or interpolated to uniform depth increments.

抛弃式温深计（Expendable Bathythermograph，XBT）数据采集自美国海岸警卫队"信赖号"巡逻舰（USCGC RELIANCE），用于支撑全球海洋综合服务系统（IGOSS）项目。此项数据由美国海岸警卫队（United States Coast Guard，USCG）于1975年12月5日至1975年12月8日期间采集。数据由国家海洋数据中心（National Oceanographic Data Center，NODC）处理为符合NODC标准的通用温深计输出（Universal Bathythermograph Output，UBT）格式。完整格式说明可通过NODC官网的https://www.nodc.noaa.gov/General/NODC-Archive/bt.html查阅。

UBT文件格式用于存储通过抛弃式温深计（XBT）仪器获取的温度-深度剖面数据。标准型XBT可获取深度约450米或760米处的剖面数据；若配备专用仪器，测量深度可达1830米。每份观测记录均包含航次信息、观测位置、日期与时间。数据记录由多组温度-深度值对构成。与机械温深计（Mechanical Bathythermograph，MBT）数据文件不同——后者以固定5米间隔记录温度值——XBT数据文件中的温度值对应非均匀深度。这些深度点为以可接受精度记录温度曲线所需的最少拐点。在数据输出时，用户可选择获取拐点处的温度值，或通过插值得到均匀深度增量下的温度值。