Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC RUSH in the Coastal Waters of California in support of the Integrated Global Ocean Services System (IGOSS) project from 23 March 1976 to 01 May 1976 (NODC Accession 7601189)

XBT data were collected from the USCGC RUSH in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the US Coast Guard (USCG) from 23 March 1976 to 01 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“拉什号”巡逻舰（USCGC RUSH），服务于综合全球海洋服务系统（Integrated Global Ocean Services System, IGOSS）项目。该数据由美国海岸警卫队（US Coast Guard, USCG）于1976年3月23日至1976年5月1日期间采集，后由美国国家海洋数据中心（National Oceanographic Data Center, NODC）处理为符合NODC标准的抛弃式温深计输出（Universal Bathythermograph Output, UBT）格式。完整格式说明可通过NODC官方网站www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。

UBT文件格式用于存储通过抛弃式温深计（XBT）获取的温度-深度剖面数据。标准型XBT可获取约450米或760米深度的剖面数据；若配备专用测量仪器，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、观测日期与时间。数据记录由温度-深度值对组成。与机械温深计（MBT）数据文件不同，MBT数据文件的温度值按均匀5米间隔记录，而XBT数据文件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”。在输出环节，用户可选择按拐点位置输出温度值，或插值至均匀深度间隔后输出。