Temperature profile data collected using XBTs from the PRESIDENT JEFFERSON from the Pacific Ocean during the Thermal Structure Monitoring Program in the Pacific (TRANSPAC) project, 08 August 1976 to 12 August 1976 (NODC Accession 8100169)

Temperature profile data were collected using bathythermograph (BT/XBT) casts from PRESIDENT JEFFERSON in the Pacific Ocean from August 8, 1976 to August 12, 1976. Data were submitted by Scripps Institution of Oceanography as part of the Thermal Structure Monitoring Program in the Pacific (TRANSPAC) project. Data were processed by NODC to the NODC standard Universal Bathythermograph Output (UBT) format. Full BT descriptions are available at http://www.nodc.noaa.gov/General/NODC-Archive/bt.html.

The UBT format contains temperature-depth profile data obtained using expendable bathythermograph (XBT) instruments. Cruise information, position, date and time were reported for each observation. The data record was comprised of pairs of temperature-depth values. Unlike the MBT Data File, in which temperature values were recorded at uniform 5 m intervals, the XBT data files contained temperature values at non-uniform depths. These depths were recorded at the minimum number of points (''inflection points'') required to accurately define the temperature curve. Standard XBTs can obtain profiles to depths of either 450 or 760 m. With special instruments, measurements can be obtained to 1830 m.

1976年8月8日至12日，“杰斐逊总统号”（PRESIDENT JEFFERSON）科考船于太平洋海域通过温深仪（bathythermograph, BT/XBT）走航观测获取了温度剖面数据。该数据由斯克里普斯海洋研究所（Scripps Institution of Oceanography）作为太平洋热结构监测计划（TRANSPAC项目）的组成部分提交。数据由国家海洋数据中心（National Oceanographic Data Center, NODC）处理为NODC标准通用温深仪输出（Universal Bathythermograph Output, UBT）格式。温深仪的完整说明可访问网址：http://www.nodc.noaa.gov/General/NODC-Archive/bt.html。

UBT格式存储了通过投弃式温深仪（expendable bathythermograph, XBT）获取的温度-深度剖面数据。每条观测记录均包含航次信息、观测位置、日期与时间，数据记录由温度-深度值对构成。与以5米均匀间隔记录温度值的机械温深仪（Mechanical Bathythermograph, MBT）数据文件不同，XBT数据文件中的温度值对应非均匀深度。这些深度以精准刻画温度曲线所需的最少测点（即“拐点”）进行记录。标准XBT可获取最大深度为450米或760米的温度剖面；若使用专用仪器，测量深度可达1830米。