Temperature profiles from XBT casts from the DUANE from Ocean Weather Station C (OWS-C) in the North Atlantic Ocean from 24 November 1973 to 17 December 1973 (NODC Accession 7400022)

Bathythermograph data were collected from the DUANE within a 1-mile radius of Ocean Weather Station C (5245N 03530W) and in transit. Data were collected by the United States Coast Guard from 24 November 1973 to 17 December 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.本数据集为温深仪（Bathythermograph）观测数据，采集自杜安号（DUANE），覆盖海洋气象站C（52°45′N，035°30′W）周边1海里范围及航行途中海域。数据由美国海岸警卫队于1973年11月24日至1973年12月17日期间采集。该观测平台配备专业设备与人员，用于开展气象与海洋状况观测。数据由美国国家海洋数据中心（National Oceanographic Data Center, NODC）处理为NODC标准通用温深仪输出（Universal Bathythermograph Output, UBT）格式。完整格式说明可通过NODC官网www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。 UBT文件格式用于存储由投弃式温深仪（Expendable Bathythermograph, XBT）获取的温深剖面数据。标准型XBT可获取约450米或760米水深的温深剖面；搭载专用设备时，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，数据记录由温深数值对组成。与采用等间距5米记录温度值的机械温深仪（Mechanical Bathythermograph, MBT）数据文件不同，XBT数据文件的温度值对应非均匀水深，这些水深点为以可接受精度记录温度曲线所需的最少点数（即“拐点”）。但在输出时，用户可选择获取拐点处的温度值，或通过插值得到均匀水深间隔下的温度值。