Davis Aerodrome Project (DAP) – Marine Current Profiling Data

The Davis Aerodrome Project (DAP) collected a range of environmental survey data over several field seasons to support a comprehensive environmental assessment of the proposed aerodrome. This data includes flora, fauna, soils, lake ecosystem, nearshore, marine, air quality and meteorological information which has been collected by a number of different methods, and extends across the current Davis Station, proposed aerodrome and supporting infrastructure footprint (Ridge Site), previous sites considered for the aerodrome (Heidemann Valley, Adams Flat), as well as locations across the Vestfold Hills away from any of the proposed developments.(this text is standard for all DAP datasets being added to the AADC). This dataset contains short-term nearshore marine current profile data collected to inform environmental assessment processes related to the Australian Antarctic Division’s DAP and Davis Masterplan projects. Eight current meter deployments were undertaken across six sites in the nearshore marine environment in the vicinity of Davis Research station. Deployment periods ranged from three days (3 x 24hr tide cycle) to two weeks. Sites were selected based on the location of previous sampling activity (CM1-5) and sites of interest to Davis Aerodrome and Davis Masterplan projects with regard to proposed future developments in the area. A second deployment was undertaken at two key sites to increase the sampling interval at each. Data was collected using a Nortec Aquadopp Profiler 1 MHz. The same instrument was used to collect current profiles at all sites. The instrument was deployed through a 40cm hole drilled through the seaice. It was suspended horizontally in the water column (mid-way between the seafloor and the under surface of the ice) by a bridal attachment and rope secured at the surface (see figure below). A 15cm fin was attached to the base of the instrument for all deployments. In shallow locations the instrument was positioned so that it could not hit the seafloor throughout the lowest tidal cycle during the deployment.The profile interval was set to record every 900 seconds (15min) for a period of 120 seconds (2min). All instrument settings and recording details are contained in the hdr files saved in each data folder. Start and end dates and times are set out in the “current meter deployment details” spreadsheet.Temporal coverageSite No.    Deployment Date    Retrieval DateCM1    22/10/2021    2/22/2021CM2    16/09/2021    19/09/2021CM2    9/10/2021    22/10/2021CM3    3/11/2021    12/11/2021CM5    24/11/2021    4/11/2021ML    8/12/2021    14/12/2021OptionA    29/09/2021    2/10/2021OptionA    14/12/2021    20/12/2021Spatial coverageCM2_01_20210919    68.57399536    77.96031373OptionA_01_20211002    68.57597253    77.96121253CM2_02_20211022    68.57399536    77.96031373CM1_01_20211102    68.57749077    77.95758156CM3_01_20211112    68.57276237    77.94873464CM5_01_20211204    68.58321738    77.9180513ML_01_20211214    -68.58381482    77.94507546OptionA_02_20211220    68.57585945    77.96151685

戴维斯机场项目（Davis Aerodrome Project, DAP）在多个野外季收集了一系列环境调查数据，以支持对拟建机场开展全面环境评估。本次采集的数据涵盖植物区系、动物区系、土壤、湖泊生态系统、近岸海域、海洋、空气质量与气象信息，采用多种不同方法完成采集，覆盖范围包括当前戴维斯站（Davis Station）、拟建机场及配套基础设施用地（里奇场址（Ridge Site））、此前拟选的机场场址（海德曼山谷（Heidemann Valley）、亚当斯平原（Adams Flat）），以及维斯弗德丘陵（Vestfold Hills）内所有拟建开发区域之外的区域。（本说明为所有纳入AADC的DAP数据集的通用标准文本）

本数据集包含短期近岸海流剖面数据，用于支撑澳大利亚南极局（Australian Antarctic Division）的DAP项目与戴维斯总体规划（Davis Masterplan）相关的环境评估工作。

在戴维斯研究站附近的近岸海洋环境中，共在6个站位开展了8次海流计布放作业。布放周期为3天（3×24小时潮汐周期）至2周不等。站位选取依据包括既往采样活动点位（CM1-5）以及与DAP和戴维斯总体规划项目相关的、区域内未来拟建开发关注的场址。其中在2个关键站位开展了第二次布放，以提升该点位的采样频次。

数据采用Nortec Aquadopp Profiler 1 MHz采集设备完成，所有站位均使用同一型号仪器进行海流剖面数据采集。仪器通过海冰上钻取的40cm孔洞进行布放，通过水面固定的绳索与悬挂吊具水平悬挂于水层中部（位于海底与冰下表面之间），详见下图。所有布放作业均在仪器底部加装了15cm的尾鳍。在浅水区，仪器布设位置需确保其在布放期间的最低潮汐周期内不会触及海底。

剖面采集间隔设置为每900秒（15分钟）采集一次，每次采集时长为120秒（2分钟）。所有仪器设置与记录详情均存储于每个数据文件夹内的hdr文件中。布放的起始与结束日期时间详见"海流计布放详情"电子表格。

### 时间覆盖范围
站位编号 | 布放日期 | 回收日期
--- | --- | ---
CM1 | 22/10/2021 | 22/02/2021
CM2 | 16/09/2021 | 19/09/2021
CM2 | 09/10/2021 | 22/10/2021
CM3 | 03/11/2021 | 12/11/2021
CM5 | 24/11/2021 | 04/11/2021
ML | 08/12/2021 | 14/12/2021
OptionA | 29/09/2021 | 02/10/2021
OptionA | 14/12/2021 | 20/12/2021

### 空间覆盖范围
点位编号 | 纬度 | 经度
--- | --- | ---
CM2_01_20210919 | 68.57399536 | 77.96031373
OptionA_01_20211002 | 68.57597253 | 77.96121253
CM2_02_20211022 | 68.57399536 | 77.96031373
CM1_01_20211102 | 68.57749077 | 77.95758156
CM3_01_20211112 | 68.57276237 | 77.94873464
CM5_01_20211204 | 68.58321738 | 77.9180513
ML_01_20211214 | -68.58381482 | 77.94507546
OptionA_02_20211220 | 68.57585945 | 77.96151685