Temperature profile data from XBT and BT casts in the North / South Atlantic Ocean through NOAA Ship RESEARCHER from 21 January 1980 to 07 March 1980 (NODC Accession 8000555)

Temperature profile data were collected using XBT and BT casts from the NOAA Ship RESEARCHER in the North / South Atlantic OCean from 21 January 1980 to 07 March 1980. Data were collected by the Atlantic Oceanographic and Meteorological Laboratory (AOML) in Miami, Florida. 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.1980年1月21日至1980年3月7日，美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）“RESEARCHER”号科考船于北大西洋/南大西洋海域，通过抛弃式温深计（expendable Bathythermograph，XBT）与BT观测剖面采集温度剖面数据。本次数据由位于佛罗里达州迈阿密的大西洋海洋与气象实验室（Atlantic Oceanographic and Meteorological Laboratory，AOML）完成采集。美国国家海洋数据中心（National Oceanographic Data Center，NODC）已将所有数据处理为符合NODC标准的通用温深计输出（Universal Bathythermograph Output，UBT）格式。完整格式说明可通过NODC官方网站www.nodc.noaa.gov/General/NODC-Archive/bt.html查询获取。 通用温深计输出（UBT）文件格式用于存储通过抛弃式温深计（XBT）仪器获取的温度-深度剖面数据。标准XBT可获取约450米或760米水深的剖面数据；若搭载专用测量仪器，最大测量水深可达1830米。每份观测记录均包含航次信息、观测位置、观测日期与时间。数据记录由多组温度-深度数值对构成。与以均匀5米间隔记录温度值的机械温深计（Mechanical Bathythermograph，MBT）数据文件不同，XBT数据文件中的温度值对应非均匀水深。这些水深点为将温度曲线记录至可接受精度所需的最少点位，即“拐点（inflection points）”。不过在数据输出环节，用户可选择按拐点提取温度值，或通过插值得到均匀深度增量下的温度数值。