Temperature profiles from expendable bathythermograph (XBT) casts from the NOAA Ship OCEANOGRAPHER in the TOGA Area - Pacific (30 N to 30 S) in support of the Integrated Global Ocean Services System (IGOSS) project from 05 March 1981 to 19 March 1981 (NODC Accession 8100629)

XBT data were collected from the NOAA Ship OCEANOGRAPHER in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the National Ocean Service (NOS) from 05 March 1981 to 19 March 1981. 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计（Expendable Bathythermograph，XBT）数据采集自美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）“海洋学家号”科考船，旨在支撑全球海洋综合服务系统（Integrated Global Ocean Services System，IGOSS）项目。数据由美国国家海洋服务局（National Ocean Service，NOS）于1981年3月5日至1981年3月19日期间采集，后经美国国家海洋数据中心（National Oceanographic Data Center，NODC）处理为符合NODC标准的通用温深计输出（Universal Bathythermograph Output，UBT）格式。完整格式说明可从NODC官方网站获取，网址为www.nodc.noaa.gov/General/NODC-Archive/bt.html。 UBT文件格式用于搭载抛弃式温深计（XBT）获取的温度-深度剖面数据。标准型XBT可获取约450米或760米水深范围内的剖面数据；若配备专用仪器，测量水深可达1830米。每份观测记录均包含航次信息、观测位置、日期与时间，数据记录由多组温度-深度数值对构成。与机械温深计（Mechanical Bathythermograph，MBT）数据文件不同——后者以每5米的固定间隔记录温度数值，XBT数据文件中的温度数值对应非均匀水深，这些水深点位为以可接受精度记录温度曲线所需的最少点数（即“拐点”）。但在数据输出环节，用户可选择获取拐点处的温度数值，或通过插值得到均匀深度间隔下的温度数据。