Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC JARVIS in the North Pacific Ocean in support of the Integrated Global Ocean Services System (IGOSS) from 05 July 1976 to 23 August 1976 (NODC Accession 7601738)

XBT data were collected from the USCGC JARVIS in support of the Integrated Global Ocean Services System (IGOSS). Data were collected by the US Coast Guard from 05 July 1976 to 23 August 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.

投弃式海温剖面仪（Expendable Bathythermograph，以下简称XBT）数据采集自美国海岸警卫队“贾维斯”号（USCGC JARVIS），服务于全球海洋综合服务系统（Integrated Global Ocean Services System，简称IGOSS）。本次数据由美国海岸警卫队于1976年7月5日至1976年8月23日期间采集完成。数据由美国国家海洋数据中心（National Oceanographic Data Center，简称NODC）按照其通用海温剖面仪输出（Universal Bathythermograph Output，简称UBT）标准格式进行处理。完整的格式说明可通过NODC官方网址www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。

UBT文件格式用于存储通过投弃式海温剖面仪采集的温度-深度剖面数据。标准型XBT可获取最大深度约450米或760米的剖面数据；若使用特制型号仪器，最大测量深度可达1830米。每份观测记录均包含航次信息、观测位置、观测日期与时刻。数据记录由多组温度-深度数值对构成。与机械海温剖面仪（Mechanical Bathythermograph，简称MBT）数据文件不同，后者以固定5米间隔记录温度数值，而XBT数据文件中的温度数值对应非均匀分布的深度。这些深度点为记录温度曲线至可接受精度所需的最少点数，即“拐点”。在数据输出环节，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。