Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC MIDGETT in the North Pacific Ocean in support of the Integrated Global Ocean Services System (IGOSS) project from 08 January 1977 to 10 May 1977 (NODC Accession 7700414)

XBT data were collected from the USCGC MIDGETT in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the US Coast Guard (USCG) from 08 January 1977 to 10 May 1977. 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.

投弃式温深计（XBT）数据采集自美国海岸警卫队米杰特号（USCGC MIDGETT），服务于全球海洋综合服务系统（Integrated Global Ocean Services System, IGOSS）项目。该数据由美国海岸警卫队（USCG）于1977年1月8日至1977年5月10日期间采集，经国家海洋数据中心（NODC）处理为符合NODC标准的通用温深计输出（Universal Bathythermograph Output, UBT）格式。完整的格式说明可通过NODC官网获取，网址为www.nodc.noaa.gov/General/NODC-Archive/bt.html。

通用温深计输出（UBT）文件格式用于存储通过投弃式温深计（Expendable Bathythermograph, XBT）仪器获取的温度-深度剖面数据。标准XBT可获取约450米或760米深度的剖面数据；配置专用仪器时，测量深度可达1830米。每条观测记录均包含航次信息、观测位置、日期及时间，数据主体由温度-深度值对构成。与机械式温深计（Mechanical Bathythermograph, MBT）数据文件不同——后者的温度值以均匀5米间隔记录——XBT数据文件中的温度值对应非均匀深度。这些深度点为记录温度曲线至可接受精度所需的最少拐点（inflection points）。在数据输出阶段，用户可按需获取拐点处的原始温度值，或通过插值得到均匀深度增量下的温度值。