Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC BIBB in the North Atlantic Ocean in support of the Integrated Global Ocean Services System (IGOSS) from 10 June 1975 to 28 July 1975 (NODC Accession 7500769)

XBT data were collected from the USCGC BIBB in support of the Integrated Global Ocean Services System (IGOSS). Data were collected by the US Coast Guard from 10 June 1975 to 28 July 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.投弃式温深仪（expendable bathythermograph，XBT）数据采集自美国海岸警卫队比布号（USCGC BIBB），用于支撑综合全球海洋服务系统（Integrated Global Ocean Services System，IGOSS）的相关工作。该数据集由美国海岸警卫队于1975年6月10日至1975年7月28日期间采集，经国家海洋数据中心（National Oceanographic Data Center，NODC）处理为符合其标准的通用投弃式温深仪输出（Universal Bathythermograph Output，UBT）格式。完整格式说明可通过NODC官方网站www.nodc.noaa.gov/General/NODC-Archive/bt.html查询获取。 UBT文件格式专用于存储通过投弃式温深仪（XBT）获取的温度-深度剖面数据。标准型XBT可获取约450米或760米深度的剖面数据；若配备专用仪器，测量深度可达1830米。每份观测记录均附带航次信息、观测位置、日期与时间。数据记录由温度-深度值对构成。与机械投弃式温深仪（Mechanical Bathythermograph，MBT）数据文件不同——后者的温度值以固定5米间隔进行记录，XBT数据文件中的温度值则对应非均匀分布的深度。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数量。不过在输出环节，用户可选择按拐点提取温度值，或通过插值得到均匀深度步长下的温度数据。