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.

本数据集包含澳大利亚南极计划（Australian Antarctic Program）下项目4593与4506所获取的冰运动观测数据。观测对象为两处陆架固定冰（landfast ice）：一处位于南极埃默里冰架（Amery Ice Shelf）东缘（南纬69.2°，东经76.3°），另一处位于斯瓦尔巴群岛格龙峡湾（Gronfjorden, Svalbard）（北纬78.0°，东经14.2°）。本数据集采用两类观测设备：Sofar Ocean Technologies公司的Spotter波浪浮标（后文简称波浪浮标），以及开源冰运动记录仪（后文简称冰浮标）。所有仪器均部署于海冰表面，核心观测目标为海冰受海浪驱动产生的垂直运动。波浪浮标搭载三轴传感器，通过GPS以2.5Hz的采样频率采集运动数据，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（IMU），以10Hz的采样频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。两类仪器均搭载GPS模块以记录自身地理坐标。两类仪器均会在仪器板载端完成运动全时间序列的处理，并通过铱星（Iridium）系统传输汇总数据。其中波浪浮标的数据传输间隔为30分钟，冰浮标的数据传输间隔为每3小时一次。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。本数据集覆盖两段观测时段：南极科考时段为2020年1月2日至8日，涉及WB1、WB2、IB1、IB2四台设备；北极科考时段为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、峰值周期以及仪器的地理坐标信息。其中，"Hs"代表有效波高（单位：米），"Tp"代表峰值周期（单位：秒）。时间采用协调世界时（UTC），格式为Matlab的序列日期数（即自公元0年起的天数）。地理坐标"lat"与"lon"分别代表纬度与经度，单位为度。需特别说明：冰浮标的GPS坐标与海浪数据通过独立的数据包传输，因此冰浮标的"time"字段对应海浪参数Hs与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通过单条数据包传输，无此区分。