Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC CAMPBELL in the North Pacific Ocean in support of the Integrated Global Ocean Services System (IGOSS) from 17 July 1978 to 21 July 1978 (NODC Accession 7800795)

XBT data were collected from the USCGC CAMPBELL in support of the Integrated Global Ocean Services System (IGOSS). Data were collected by the US Coast Guard from 17 July 1978 to 21 July 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.

本数据集的抛弃式温深计（expendable bathythermograph，XBT）数据采集自美国海岸警卫队坎贝尔号（USCGC CAMPBELL），用于支撑综合全球海洋服务系统（Integrated Global Ocean Services System，IGOSS）。数据由美国海岸警卫队于1978年7月17日至1978年7月21日完成采集。美国国家海洋数据中心（National Oceanographic Data Center，NODC）已将这批数据处理为符合NODC标准的通用抛弃式温深计输出（Universal Bathythermograph Output，UBT）格式。完整的格式说明可通过NODC官网（www.nodc.noaa.gov/General/NODC-Archive/bt.html）获取。

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XBT可获取深度约为450米或760米的剖面数据；若配备专用仪器，测量深度可达1830米。每条观测记录均包含巡航信息、观测位置、日期及时间。数据记录由温度-深度值对构成。与以5米均匀间隔记录温度值的机械式温深计（MBT）数据文件不同，XBT数据文件中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”。不过在数据输出时，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。