Acoustic Doppler Current Profiler Data - 2014

Acoustic Doppler current profiler data (ADCP) were collected using a RD Instruments, 300 kHz ADCP that was mounted on an acoustic sled and towed alongside the R/V Annika Marie. Deployment was somewhat limited by weather, with higher sea states precluding use of the instrument. Data were processed by Frank Bahr at the Woods Hole Oceanographic Institution. Ten files are included. Data are included in three files: A matlab file and .zip file and .tar files containing ascii files for each deployment. A "readme" file documents the format for the ascii and matlab files. Processing notes are provided in the file: sos2014barrow_procnotes.txt .png files of the surface currents for each deployment also are included for reference. 1.) Matlab format. The .mat file sos2014_dt.mat contains all deployments in the structure vm_data ; The format is described in a text variable "readme" 2.) ascii format ; The data are also presented in ascii, with one data file per deployment, with files zipped together in to sos2014dt_ascii.zip or sos2014dt_asc.tar ; The first line of each file gives the center depth of the ADCP bins in meters. ; Note that both the bin depths as well as the number of bins may change ; between deployments ; It is followed by one line per ADCP profile, listing ; - profile time as year/month/day hour:min:sec ; - profile time in 2010 decimal days (noon on Jan 1 equals decimal day 0.5) ; - longitude, latitude in decimal degrees ; - N values of zonal velocity, positive eastward, where N is the number of bins ; - N values of meridional velocity, positive northward ; "Bad" data are marked with the flag value 999.99.声学多普勒流速剖面仪（Acoustic Doppler Current Profiler, ADCP）数据由RD Instruments公司生产的300 kHz型号ADCP采集，该仪器搭载于声学滑橇上，随R/V Annika Marie科考船同步拖曳作业。本次数据采集作业受天气条件一定限制，海况较高时无法启用该仪器。数据由伍兹霍尔海洋研究所（Woods Hole Oceanographic Institution）的Frank Bahr完成处理。本数据集共计包含10个文件。 数据以三类文件形式存储：一个Matlab格式文件、一个.zip压缩包，以及若干.tar压缩包（内含各次部署的ASCII格式数据文件）；另有一份"readme"文件说明ASCII与Matlab格式文件的结构规范。数据集的处理说明详见sos2014barrow_procnotes.txt文件；同时附带各次部署的表层流速.png图像文件，供参考使用。 1. Matlab格式：sos2014_dt.mat文件以vm_data结构体存储所有部署场次的观测数据，其格式规范由文件内的文本变量"readme"说明。 2. ASCII格式：数据同时提供ASCII格式版本，单次部署对应一个数据文件，所有部署数据文件分别打包为sos2014dt_ascii.zip与sos2014dt_asc.tar；每个数据文件的首行给出ADCP测量单元（bins）的中心深度，单位为米。请注意，不同部署场次的测量单元深度与单元数量可能存在差异。 文件后续每行对应一条ADCP剖面观测数据，依次包含： - 剖面观测时间，格式为年/月/日 时:分:秒 - 以2010年为基准的十进制日数（1月1日正午对应十进制日数0.5） - 经纬度，单位为十进制度 - N个纬向流速数值（东向为正），N为ADCP测量单元的总数量 - N个经向流速数值（北向为正） 其中无效数据以标记值999.99标注。