Temperature profiles from mechanical bathythermograph (XBT) casts from the USS FEARLESS in the North Atlantic Ocean in support of the Fleet Observations of Oceanographic Data (FLOOD) project from 03 October 1971 to 27 October 1971 (NODC Accession 7101382)
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XBT data were collected from the USS FEARLESS in support of the Fleet Observations of Oceanographic Data (FLOOD) project. Data were collected by US Navy; Ships of Opportunity from 03 October 1971 to 27 October 1971. 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 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 reque
本数据集的抛弃式温深计（expendable bathythermograph, XBT）数据采集自美国海军“无畏号”（USS FEARLESS）舰艇，用于支持海洋学数据舰队观测（Fleet Observations of Oceanographic Data, FLOOD）项目。数据由美国海军及机遇观测船于1971年10月3日至1971年10月27日期间采集。该平台配备专业观测设备与操作人员，用于开展气象与海洋环境状况观测。所有数据已由国家海洋数据中心（National Oceanographic Data Center, NODC）按照NODC标准通用温深仪输出（Universal Bathythermograph Output, UBT）格式完成标准化处理。完整格式说明可通过NODC官网获取，网址为www.nodc.noaa.gov/General/NODC-Archive/bt.html。
UBT文件用于存储使用抛弃式温深计（XBT）获取的温度-深度剖面数据。标准型XBT可在约450米或760米深度获取剖面数据；若配备专用型号仪器，测量深度可达1830米。每条观测记录均附带巡航信息、观测位置、日期与时间。数据记录由温度-深度值对构成。与采用均匀5米间隔记录温度的机械温深计（MBT）数据文件不同，XBT数据文件中的温度值对应非均匀深度。这些深度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”）。不过在输出环节，用户可申请reque
创建时间：
2016-03-24
