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 June 1978 to 24 June 1978 (NODC Accession 7800546)

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 June 1978 to 24 June 1978. 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“米吉特”号（USCGC MIDGETT），用于支撑全球海洋综合服务系统（Integrated Global Ocean Services System, IGOSS）项目。该批数据由美国海岸警卫队（US Coast Guard, USCG）于1978年6月8日至1978年6月24日期间采集，后由国家海洋数据中心（National Oceanographic Data Center, NODC）按照其标准通用温深计输出（Universal Bathythermograph Output, UBT）格式完成处理。完整格式说明可通过国家海洋数据中心官网www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。
UBT文件格式用于存储通过抛弃式温深计（XBT）获取的温度-深度剖面数据。标准型XBT可获取约450米或760米水深的剖面数据；配置专用仪器时，测量水深可达1830米。每条观测记录均包含航次信息、站位坐标、观测日期与时间。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——后者的温度值按均匀5米间隔记录，XBT数据文件的温度值对应非均匀水深。这些水深点为将温度曲线记录至可接受精度所需的最少关键点（即“拐点”）。不过在输出环节，用户可选择按拐点输出温度值，或插值至均匀深度间隔后进行输出。