Temperature profiles from expendable bathythermograph (XBT) casts from the USCGC MELLON in the North Pacific Ocean in support of the Integrated Global Ocean Services System (IGOSS) project from 03 November 1977 to 09 November 1977 (NODC Accession 7800080)

XBT data were collected from the USCGC MELLON in support of the Integrated Global Ocean Services System (IGOSS) project. Data were collected by the US Coast Guard (USCG) from 03 November 1977 to 09 November 1977. 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.本数据集的抛弃式深海测温仪（expendable bathythermograph, XBT）数据采集自美国海岸警卫队“梅隆号”（USCGC MELLON），用于支撑全球海洋综合服务系统（Integrated Global Ocean Services System, IGOSS）项目。该批数据由美国海岸警卫队（US Coast Guard, USCG）于1977年11月3日至1977年11月9日期间采集，后由国家海洋数据中心（National Oceanographic Data Center, NODC）处理为符合NODC标准的通用深海测温仪输出（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文件格式用于存储通过XBT仪器获取的温度-深度剖面数据。标准型XBT可获取约450米或760米深度的剖面数据；搭载专用仪器时，测量深度可达1830米。每条观测记录均附带航次信息、观测位置、日期与时间。数据记录由多组温度-深度值对组成。与机械式深海测温仪（Mechanical Bathythermograph, MBT）数据文件不同——MBT数据文件以均匀5米间隔记录温度值——XBT数据文件的温度值对应非均匀深度，这些深度点为可在可接受精度范围内完整记录温度曲线所需的最少拐点数量。不过在输出环节，用户可选择按拐点位置或插值至均匀深度增量的方式获取温度值。