Temperature profiles from XBT casts from the DISCOVERER and the SURVEYOR in the Gulf of Alaska and other locations in support of the Outer Continental Shelf Environmental Assessment Program (OCSEAP) from 21 July 1977 to 31 July 1978 (NODC Accession 8400123)

Temperature profiles were collected from XBT casts from the DISCOVERER and SURVEYOR in the Gulf of Alaska and other locations. Data were collected by the National Ocean Service - Seattle (NOS) as part of the Outer Continental Shelf Environmental Assessment Program (OCSEAP) from 21 July 1977 to 31 July 1978. 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 format contains temperature-depth profile data obtained using expendable bathythermograph (XBT) instruments. Cruise information, position, date and time were reported for each observation. The data records are comprised of pairs of temperature-depth values. The XBT data files contain temperature values at non-uniform depths. These depths were recorded at the minimum number of points (''inflection points'') required to accurately define the temperature curve. Standard XBTs can obtain profiles to depths of either 450 or 760 m. Special instruments permit measurements to be obtained to 1830 m.

本数据集的温度剖面数据采集自阿拉斯加湾及其他海域“发现者号（DISCOVERER）”与“测量者号（SURVEYOR）”科考船投放的可抛弃式温深计（expendable bathythermograph, XBT）观测数据。该数据集由美国国家海洋服务局西雅图分部（National Ocean Service - Seattle, NOS）于1977年7月21日至1978年7月31日期间，作为外大陆架环境评估计划（Outer Continental Shelf Environmental Assessment Program, OCSEAP）的一部分采集完成。所有数据已由国家海洋数据中心（National Oceanographic Data Center, NODC）处理为通用温深计输出（Universal Bathythermograph Output, UBT）标准格式。完整格式说明可通过国家海洋数据中心官网www.nodc.noaa.gov/General/NODC-Archive/bt.html获取。

UBT格式存储了通过可抛弃式温深计（XBT）获取的温度-深度剖面数据。每条观测记录均包含科考航次信息、观测位置、观测日期与时间。数据记录由温度与深度的数值对组成。XBT数据文件中的温度值对应非均匀分布的深度，这些深度点为准确刻画温度曲线所需的最少数量的“拐点”。标准型XBT可获取深度达450米或760米的温度剖面，特殊定制仪器则可实现1830米深度的测量。