Temperature profiles from expendable bathythermograph (XBT) casts from the NOAA Ship OCEANOGRAPHER in the North Pacific Ocean in support of the Integrated Global Ocean Services System (IGOSS) project from 06 February 1974 to 20 February 1974 (NODC Accession 7400203)

XBT data were collected from the NOAA Ship OCEANOGRAPHER in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the National Ocean Service (NOS) from 06 February 1974 to 20 February 1974. 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）数据由美国国家海洋和大气管理局（NOAA）“OCEANOGRAPHER”号科考船采集，用于支持综合全球海洋服务系统（Integrated Global Ocean Services System, IGOSS）项目。该数据由国家海洋服务局（National Ocean Service, NOS）于1974年2月6日至1974年2月20日期间采集，随后由国家海洋数据中心（National Ocean Data Center, NODC）处理为符合NODC标准的抛弃式温深计通用输出（Universal Bathythermograph Output, UBT）格式。完整格式说明可从NODC官网获取，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可获取深度约450米或760米的温度剖面；配备专用仪器时，测量深度可达1830米。每一条观测记录均附带航次信息、观测位置、观测日期与时间。数据记录由多组温度-深度值对组成。与以5米均匀间隔记录温度值的机械温深计（MBT）数据文件不同，XBT数据文件中的温度值对应非均匀分布的深度。这些深度点为以可接受精度完整记录温度曲线所需的最少点数，即“拐点”。不过在数据输出环节，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数值。