Chemical and bathythermograph data from moored current meter casts and other instruments from NOAA Ship Researcher and other platforms in the Gulf of Mexico with support from the Brine Disposal project, 1981-05-19 to 1983-04-12 (NODC Accession 8300152)

Chemical and bathythermograph data were collected using moored current meter casts and other instruments from NOAA Ship RESEARCHER and CAPT. BRADY J in the Gulf of Mexico from May 19, 1981 to April 12, 1983. Data were submitted by RAYTHEON CO. as part of the Brine Disposal project. Data has been been processed by NODC to the NODC standard F004- Water Physics and Chemistry format and Universal Bathythermograph Output (UBT) format. Full format descriptions are available from NODC homepage at http://www.noaa.nodc.gov.

The F004 format is used for data from measurements and analyses of physical and chemical characteristics of the water column. Among chemical parameters that may be recorded are salinity, PH, and concentration of oxygen, ammonia, nitrate, phosphate, chlorophyll, and suspended solids. Physical parameters that may be recorded include temperature, density (sigma-t), transmissivity, and current velocity (east-west and north-south components). Cruise and station information, including environmental conditions of the study site at the time of observations, is also included.

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.

本数据集采集了1981年5月19日至1983年4月12日期间，在墨西哥湾海域，由NOAA“研究者号”科考船（NOAA Ship RESEARCHER）与布雷迪J号（CAPT. BRADY J）通过锚定海流计观测及其他仪器获取的化学与深海测温仪（Bathythermograph）数据。雷神公司（RAYTHEON CO.）作为“盐水处置项目（Brine Disposal project）”的组成部分提交了本数据集。数据集已由美国国家海洋数据中心（National Oceanographic Data Center, NODC）处理为NODC标准F004-水体物理与化学格式及通用深海测温仪输出（Universal Bathythermograph Output, UBT）格式。完整格式说明可从NODC官网http://www.noaa.nodc.gov获取。

F004格式用于存储水柱物理与化学特性的测量及分析数据。可记录的化学参数包括盐度、酸碱度（pH）、氧、氨、硝酸盐、磷酸盐、叶绿素及悬浮固体的浓度。可记录的物理参数包括温度、密度（sigma-t）、透射率及海流速度（东西向与南北向分量）。数据集同时包含航次与测站信息，包括观测时研究海域的环境条件。

UBT文件格式用于存储使用抛弃式深海测温仪（expendable bathythermograph, XBT）获取的温度-深度剖面数据。标准XBT可获取约450米或760米深度的剖面数据；使用专用仪器时，测量深度可达1830米。每条观测记录均包含航次信息、观测位置、日期与时间。数据记录由温度-深度值对组成。与机械式深海测温仪（MBT）数据文件（其中温度值以均匀5米间隔记录）不同，XBT数据文件存储的温度值对应非均匀深度。这些深度点为以可接受的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深度间隔下的温度值。