Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC ACUSHNET in the Gulf of Mexico in support of the Integrated Global Ocean Services System (IGOSS) from 14 December 1977 to 19 December 1977 (NODC Accession 7800066)

XBT data were collected from the USCGC ACUSHNET in support of the Integrated Global Ocean Services System (IGOSS). Data were collected by the US Coast Guard from 14 December 1977 to 19 December 1977. 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.本数据集的投弃式温深计（Expendable Bathythermograph，XBT）数据采集自美国海岸警卫队“阿库什尼特”号（USCGC ACUSHNET），用于支撑全球海洋综合服务系统（Integrated Global Ocean Services System，IGOSS）的运行。本次数据采集工作由美国海岸警卫队于1977年12月14日至19日期间完成。数据由美国国家海洋数据中心（National Oceanographic Data Center，NODC）按照其通用温深计输出格式（Universal Bathythermograph Output，UBT）标准进行处理。完整格式说明可从NODC官网的https://www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。 UBT文件格式用于存储通过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米的剖面数据；若使用专用仪器，则可将测量深度拓展至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-深度数值对构成。与机械温深计（Mechanical Bathythermograph，MBT）数据文件不同——后者以固定5米间隔记录温度数值——XBT数据文件中的温度数值对应非均匀分布的深度。这些深度点仅为以可接受精度记录温度曲线所需的最少数量的“拐点”。但在数据输出时，用户可选择获取拐点处的原始温度数值，或通过插值得到均匀深度间隔下的温度数据。