Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC GALLATIN in the North Atlantic Ocean in support of the Integrated Global Ocean Services System (IGOSS) from 18 April 1976 to 09 May 1976 (NODC Accession 7601162)

XBT data were collected from the USCGC GALLATIN in support of the Integrated Global Ocean Services System (IGOSS). Data were collected by the US Coast Guard from 18 April 1976 to 09 May 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.

抛弃式温深计（expendable bathythermograph, XBT）数据采集自美国海岸警卫队加兰廷号（USCGC GALLATIN），用于支撑全球海洋综合服务系统（Integrated Global Ocean Services System, IGOSS）。本次数据由美国海岸警卫队于1976年4月18日至1976年5月9日期间采集完成。数据经美国国家海洋数据中心（National Oceanographic Data Center, NODC）处理，符合其制定的通用温深计输出（Universal Bathythermograph Output, UBT）标准格式。完整的格式说明可通过NODC官方链接https://www.nodc.noaa.gov/General/NODC-Archive/bt.html查阅获取。

UBT文件格式用于存储通过XBT采集的温度-深度剖面数据。标准型XBT可获取深度约450米或760米处的剖面数据；若配备特制仪器，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、观测日期与时间。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）数据文件按5米等间隔记录温度值的模式不同，XBT数据文件中的温度值对应非均匀深度。这些非均匀深度点为将温度曲线记录至可接受精度所需的最少采样点，即“拐点”。在数据输出环节，用户可自行选择获取拐点处的原始温度值，或通过插值计算得到均匀深度间隔下的温度数值。