Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC MORGENTHAU in the North Atlantic Ocean in support of the Integrated Global Ocean Services System (IGOSS) project from 01 February 1976 to 14 February 1976 (NODC Accession 7600672)

XBT data were collected from the USCGC MORGENTHAU in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the US Coast Guard (USCG) from 01 February 1976 to 14 February 1976. 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.本投放式温深仪（Expendable Bathythermograph，XBT）数据采集自美国海岸警卫队摩根索号（USCGC MORGENTHAU），用于支撑全球海洋综合服务系统（Integrated Global Ocean Services System，IGOSS）项目。数据由美国海岸警卫队（US Coast Guard，USCG）于1976年2月1日至1976年2月14日期间采集，后经国家海洋数据中心（National Oceanographic Data Center，NODC）处理为符合其标准的通用温深仪输出（Universal Bathythermograph Output，UBT）格式。完整格式说明可通过NODC官网www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。 UBT文件格式用于记录通过XBT获取的温度-深度剖面数据。标准型XBT可获取约450米或760米深度范围内的剖面数据；搭载专用仪器时，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。数据记录由多组温度-深度值对构成。与深度间隔固定为5米的机械式温深仪（Mechanical Bathythermograph，MBT）数据文件不同，本XBT数据文件的温度值对应的深度并非均匀分布，而是仅记录能够以可接受精度还原温度曲线所需的最少拐点（inflection points）。不过在输出环节，用户可选择按拐点位置或按均匀深度增量插值的方式获取温度值。