Temperature profiles from XBT casts from the JARVIS from Ocean Weather Station N (OWS-N) in the North Pacific Ocean from 04 April 1973 to 06 May 1973 (NODC Accession 7300594)

Bathythermograph data were collected from the JARVIS within a 1-mile radius of Ocean Weather Station N (3000N 14000W) and in transit. Data were collected by the United States Coast Guard from 04 April 1973 to 06 May 1973. The platform was equipped and staffed to observe weather and sea conditions. 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) instrument. 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.温深仪（Bathythermograph）数据采集自JARVIS平台，采集范围覆盖N海洋气象站（30°00′N，140°00′W）周边1英里范围内及航行途中的海域。该数据集由美国海岸警卫队于1973年4月4日至1973年5月6日采集完成。观测平台配备专业设备并配有操作人员，用于开展气象与海洋状况观测。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。完整的格式说明可通过NODC官网的https://www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。 UBT文件格式用于存储使用投放式温深仪（Expendable Bathythermograph, XBT）采集的温度-深度剖面数据。标准型XBT可获取约450米或760米深度范围内的温度剖面；若使用专用仪器，测量深度可拓展至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。与机械式温深仪（Mechanical Bathythermograph, MBT）数据文件不同——该类文件以均匀5米间隔记录温度数值，而XBT数据文件的温度数值则对应非均匀深度。这些深度点为以可接受精度记录温度曲线所需的最少点数，即“拐点”。但在输出环节，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值。