Temperature profiles from XBT casts from the MUNRO from Ocean Weather Station N (OWS-N) in the North Pacific Ocean from 25 October 1973 to 26 November 1973 (NODC Accession 7301201)

Bathythermograph data were collected from the MUNRO 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 25 October 1973 to 26 November 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.

本数据集包含从门罗号（MUNRO）采集的深海温度记录仪（Bathythermograph）数据，采集范围覆盖N号海洋气象站（Ocean Weather Station N，坐标30°00′N 140°00′W）周边1英里海域及航行途经海域。数据采集工作由美国海岸警卫队于1973年10月25日至1973年11月26日期间完成。该观测平台配备专业观测设备并配有操作人员，用于开展气象与海洋环境监测。所有数据均由美国国家海洋数据中心（National Oceanographic Data Center，简称NODC）处理为符合其标准的通用深海温度记录仪输出格式（Universal Bathythermograph Output，简称UBT）。完整的格式说明可从NODC官网获取，链接为：www.nodc.noaa.gov/General/NODC-Archive/bt.html。
UBT文件格式用于存储通过投弃式深海温度记录仪（expendable bathythermograph，简称XBT）获取的温度-深度剖面数据。标准型XBT可获取约450米或760米深度范围内的温度剖面；若使用特制仪器，测量深度可拓展至1830米。每条观测记录均包含航次信息、观测位置、观测日期与时间。单条数据记录由多组温度-深度数值对组成。与机械深海温度记录仪（Mechanical Bathythermograph，简称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的深度并不均匀。这些深度点仅为满足温度曲线可接受的记录精度所需的最少点数，即“拐点（inflection points）”。但在数据输出时，用户可选择获取拐点处的原始温度数值，或通过插值得到固定深度间隔下的温度数值。