Temperature profiles from expendable bathythermograph (XBT) casts from the KANE in the North Atlantic Ocean in support of the Integrated Global Ocean Services System (IGOSS) project from 27 September 1975 to 01 November 1975 (NODC Accession 7601750)

XBT data were collected from the KANE in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the US Navy; Naval Oceanographic Office (NAVOCEANO) from 27 September 1975 to 01 November 1975. 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）数据采集自凯恩号科考船，用于支撑全球海洋综合服务系统（Integrated Global Ocean Services System, IGOSS）项目。该批数据由美国海军海洋学办公室（Naval Oceanographic Office, NAVOCEANO）于1975年9月27日至1975年11月1日采集完成，随后由国家海洋数据中心（National Oceanographic Data Center, NODC）按照NODC标准抛弃式温深仪通用输出（Universal Bathythermograph Output, UBT）格式完成标准化处理。完整的格式说明文档可通过NODC官网获取：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仪（XBT）采集得到的温度-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；若配备专用仪器，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、观测日期与观测时间。数据记录由多组温度-深度值对构成。与机械式温深仪（MBT）数据文件不同——后者的温度值以均匀5米间隔进行记录——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拐点数量。但在数据输出环节，用户可自主选择获取拐点处的原始温度值，或通过插值得到均匀深度间隔下的温度数值。