Temperature profiles from expendable bathythermograph (XBT) casts from the NOAA ship Researcher in the North Atlantic Ocean in support of the Integrated Global Ocean Services System (IGOSS) project from 06 June 1974 to 16 June 1974 (NODC Accession 7400481)

XBT data were collected from the NOAA ship Researcher in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the US DOC; NOAA; National Ocean Service - Miami from 06 June 1974 to 16 June 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.

本数据集的抛弃式温深仪（expendable bathythermograph，XBT）数据采集自美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）的"Researcher"号科考船，用于支撑综合全球海洋服务系统（Integrated Global Ocean Services System，IGOSS）项目。数据由美国商务部（US DOC）、NOAA、国家海洋服务局迈阿密分局于1974年6月6日至1974年6月16日期间采集完成，后由国家海洋数据中心（National Oceanographic Data Center，NODC）处理为NODC标准的通用抛弃式温深仪输出（Universal Bathythermograph Output，UBT）格式。完整格式说明可通过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XBT仪器获取的温度-深度剖面数据。标准XBT设备可采集约450米或760米深度的剖面数据；搭配专用仪器时，最大测量深度可达1830米。每条观测记录均附带航次信息、观测位置、日期与时间。数据记录由温度-深度值对构成。与MBT数据文件不同——MBT数据文件以固定5米间隔记录温度值，XBT数据文件中的温度值对应非均匀深度，这些深度点为以可接受精度记录温度曲线所需的最少"拐点"数量。不过在输出环节，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值。