Current values collected through the water column using an Acoustic Doppler Current Profiler (ADCP) in the centre of Jervis Bay: Winter Deployment

The record describes data collected from a winter deployment of an Acoustic Doppler Current Profiler (ADCP) moored in the central part of Jervis Bay, New South Wales (35o 05'S, 150o 44'E). An ADCP measures how fast water is moving across an entire water column. Anchored to the seafloor it can measure current speed not just at the bottom, but also at equal intervals all the way up to the surface. For this experiment, the ADCP was moored on the seabed, in a frame, with sensors looking upwards and approximately 0.5m above the seabed. \n\nOver the winter deployment, 26th July 1991 to 26th September 1991, the ADCP was set-up with a 60 minute sampling interval and currents were measured over 1m depth bins. Bin numbers and currents are referenced as a height above the seabed (due to the uncertainty in defining water depth because of tides and air pressure). As such Bin #1 is centered at 1.5m above the transducer face or 2.0m above the seabed. Bin #2 is centered at 3m above the seabed, Bin #3 at 4m and so on.\nThe water depth was measured as 24m on deployment and the first 19 bins provided good data. Currents from bin 20 up were very noisy and it is inferred that contamination had occurred. These bins were removed from the dataset.\n\nTwo resources are provided in this record: 1) A schematic of depth bin location for the winter deployment and, 2) The raw, or unfiltered current values for each bin depth provided every 60 minutes in terms of east/west and north/south components.\n\nThis child record relates to the parent, c571bb80-2ae7-11dd-a735-00188b4c0af8. A pdf outlining the structure and hierarchy of all metadata records relating to this project is available to download through this record. Also available is a pdf of a published working paper documenting this experiment and the results.

本记录包含1991年冬季于新南威尔士州杰维斯湾中部（南纬35°05′，东经150°44′）锚定的声学多普勒流速剖面仪（Acoustic Doppler Current Profiler, ADCP）采集的观测数据。声学多普勒流速剖面仪（ADCP）可测量全水柱的水流速度，其锚定在海底时，不仅能测量近底流速，还能以等间隔向上直至海面的各层流速。本实验中，ADCP被安装在海底的固定框架内，传感器朝上安装，距海底约0.5米。

本次冬季部署时段为1991年7月26日至1991年9月26日，期间ADCP设置为60分钟采样间隔，以1米为深度分层单元开展流速测量。由于潮汐与气压会导致水深定义存在不确定性，因此各分层编号与流速均以距海底的高度为参考基准。据此，第1号分层的中心位置位于换能器端面上方1.5米处，或海底上方2.0米处；第2号分层中心位于海底上方3.0米处，第3号分层位于4.0米处，依此类推。

部署时测得实际水深为24米，前19个分层可获取有效数据；第20号及以上分层的流速数据噪声极大，经推测存在数据污染，故已将该部分分层的观测值从本数据集中移除。

本记录提供两项资源：1）本次冬季部署的深度分层位置示意图；2）每60分钟采集的各深度分层原始未滤波流速数据，包含东-西向与北-南向分量。

本子记录关联父记录c571bb80-2ae7-11dd-a735-00188b4c0af8。用户可通过本记录下载一份PDF文档，该文档概述了本项目所有元数据记录的结构与层级关系；同时还可下载一份已发表的工作论文PDF，用于记录本实验的相关内容与研究结果。