Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC EVERGREEN in the North Atlantic Ocean in support of the Integrated Global Ocean Services System (IGOSS) from 25 July 1979 to 20 August 1979 (NODC Accession 7900273)

XBT data were collected from the USCGC EVERGREEN in support of the Integrated Global Ocean Services System (IGOSS). Data were collected by the US Coast Guard from 25 July 1979 to 20 August 1979. 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常青号（USCGC EVERGREEN），用于支撑全球海洋综合服务系统（Integrated Global Ocean Services System, IGOSS）。该数据由美国海岸警卫队于1979年7月25日至1979年8月20日期间采集。数据由美国国家海洋数据中心（National Oceanographic Data Center, NODC）按照NODC标准抛弃式温深计输出（Universal Bathythermograph Output, UBT）格式进行处理。完整的格式说明可从NODC获取，网址为www.nodc.noaa.gov/General/NODC-Archive/bt.html。

UBT文件格式用于存储通过XBT仪器获取的温度-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。每条观测记录均包含航次信息、观测位置、日期与时间。数据记录由温度-深度值对组成。与机械温深计（Mechanical Bathythermograph, MBT）数据文件不同——MBT数据文件以均匀5米间隔记录温度值，而XBT数据文件的温度值对应非均匀深度。这些深度点为将温度曲线记录至可接受精度所需的最少点数（即“拐点”）。但在数据输出时，用户可选择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。