Acoustic Doppler Current Profiler Data - 2011

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. Three files are included: A matlab file and .zip file and .tar files containing ascii files for each deployment. 1.) Matlab format. The .mat file sos2011_dt.mat contains all deployments in the structure vm_data ; The format is described in a text variable "readme" contained in sos2010_dt.mat 2.) ascii format ; The data are also presented in ascii, with one data file per deployment, with files zipped together in to sos2011dt_ascii.zip or sos2011dt_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.

本数据集为声学多普勒流速剖面仪（Acoustic Doppler Current Profiler，ADCP）采集数据，所用仪器为RD Instruments公司生产的300 kHz ADCP，该设备搭载于声学滑橇上，随R/V Annika Marie号科考船并行拖曳开展作业。本次部署受天气条件限制较为显著，当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。数据集共包含三类文件：一份Matlab格式文件、一份压缩包文件，以及一份包含各次部署ASCII格式数据的tar归档文件。1. Matlab格式：sos2011_dt.mat文件以vm_data结构体存储了所有部署任务的采集数据，其格式说明可通过sos2010_dt.mat内置的文本变量"readme"查阅。2. ASCII格式：数据同时提供ASCII格式版本，按单次部署生成独立数据文件，并打包为sos2011dt_ascii.zip或sos2011dt_asc.tar。每个文件的首行为ADCP测层的中心深度（单位：米）。需注意，不同部署任务间的测层深度及测层数量可能存在差异。后续每一行对应一条ADCP剖面数据，依次包含以下字段：- 剖面采集时间，格式为年/月/日 时:分:秒- 该剖面时间对应的2010年十进制日（1月1日正午对应十进制日0.5）- 以十进制度表示的经度、纬度- N个纬向流速数值（东向为正），其中N为测层总数- N个经向流速数值（北向为正）无效数据以标记值999.99标注。