Wave-Ice interactions and ice break-up observations in the Southern Ocean, 2020

This dataset contains ice motion observations made under the Australian Antarctic Program, Projects 4593 and 4506. Measurements of ice motion where made on (land)fast ice on the eastern rim of the Amery Ice Shelf, Antarctica (69.2 degr. S, 76.3 degr. E) and on landfast ice in Gronfjorden, Svalbard (78.0 degr. N, 14.2 degr. E). Data was obtained using Spotter wave buoys (Sofar Ocean Technologies), hereafter wave buoys, and open-source ice motion loggers, hereafter ice buoys. Instrumentation was deployed on top of the sea ice with the main motivation to measure its vertical motion due to ocean waves. The wave buoys 3-axis measure motion at 2.5 Hz through GPS and have an accuracy of approximately 2 cm for the significant wave height. The ice buoys measure motion in 9-degrees-of-freedom at 10Hz using a VectorNAV VN-100 IMU, accuracy is O(mm) for short waves and O(cm) for long waves. Both instruments also record their geographical location through GPS. Full time series of their motion is processed on board and summaries are send through Iridium. For the wave buoy, this occurred at an interval of 30 minutes. For the ice buoy this occurred every 3 hours. In the dataset, WB and IB are abbreviations for wave buoy and ice buoy, respectively. This dataset covers 2-8 January 2020 for the Antarctic campaign (WB1, WB2, IB1, IB2) and 14-28 March for the Arctic campaign (IB3, IB4, IB5) and includes significant wave height, peak period and the geographical coordinates of the instrumentation. ‘Hs’ refers to significant wave height (in meters). ‘Tp’ refers to peak period (in seconds). Time is in UTC, and in Matlab’s datenum format (i.e. the number of days since year 0000). The geographical coordinates ‘lat’ and ‘lon’ (latitude and longitude, respectively) are in degrees. Note, as the ice buoys transmit the GPS coordinates and wave data in separate data messages, for the ice buoys ‘time’ refers to the reference time of the wave properties Hs and Tp, whereas ‘time_latlon’ refers to the reference time of the geographical coordinates. For the wave buoy, all data is transmitted in one message.本数据集收录了澳大利亚南极计划（Australian Antarctic Program）第4593与4506项目下获取的海冰运动观测数据。观测点位分别位于南极埃默里冰架东缘的固定冰（69.2°S，76.3°E），以及斯瓦尔巴群岛格陵峡湾的固定冰（78.0°N，14.2°E）。数据采集采用了Spotter波浪浮标（Sofar Ocean Technologies公司出品，下称波浪浮标）与开源海冰运动记录仪（下称冰浮标）。所有设备均部署于海冰表面，核心观测目标为海冰因海浪引发的垂直运动。 波浪浮标搭载三轴传感器，通过GPS以2.5Hz的采样率记录运动数据，有效波高测量精度约为2厘米。冰浮标则搭载VectorNAV VN-100惯性测量单元（Inertial Measurement Unit, IMU），以10Hz的采样率采集九自由度运动数据，其短波测量精度可达毫米级，长波测量精度为厘米级。两类设备均通过GPS记录自身地理坐标。设备会在本地完成运动全时序数据的处理，并通过铱星（Iridium）通信系统回传汇总数据：波浪浮标每30分钟回传一次，冰浮标则每3小时回传一次。 本数据集中，WB与IB分别为波浪浮标（wave buoy）与冰浮标（ice buoy）的缩写。南极观测时段为2020年1月2日至8日，涉及WB1、WB2、IB1、IB2四台设备；北极观测时段为2020年3月14日至28日，涉及IB3、IB4、IB5五台设备。数据集包含有效波高、峰值周期与设备地理坐标等字段。其中，“Hs”代表有效波高（单位：米），“Tp”代表峰值周期（单位：秒）。时间采用UTC时区，以Matlab的日期数字格式存储（即自公元0年起的累计天数）。地理坐标字段“lat”与“lon”分别代表纬度与经度，单位为度。需要注意的是，冰浮标会分别回传GPS坐标与海浪数据报文，因此对于冰浮标而言，“time”字段对应有效波高Hs与峰值周期Tp的参考时间，而“time_latlon”字段对应地理坐标的参考时间；波浪浮标的所有数据均整合于单条报文中回传。