In situ Lagrangian drifting buoy data off East Antarctica for the austral spring of 2012, deployed during the SIPEX II voyage of the Aurora Australis

In situ Lagrangian drifter positions were collected from nine expendable sea-ice buoys. Positions were collected by GPS receivers aboard each buoy and relayed via the CLS Argos satellite data system.

The scientific proposal for this project was based on the deployment of two meso-scale buoy arrays over the continental shelf break in the SIPEX 2012 experimental region. Resolving of ice motion over the continental shelf and the shelf break is expected to provide crucial information on sea-ice deformation and ice strength. However, due to the unfavourable cruise track and also due to operational issues with helicopter support, it was not possible to deploy any of the meso-scale buoy arrays. Instead buoys were deployed to resolve ice deformation within the wider SIPEX 2012 region.

Position data are available hourly from most buoys. CLS Argos transmitted data suffer from a data transmission blackspot just prior to local none, when there will be no data available.

Data processing will be carried out as described in Heil et al. [2008]
The dataset is build from ASCII files for each buoy with time stamps and observed latitude and longitude. The format (by column [C] for each file is as following:

C1: Program ID
C2: Buoy ID
C3: Year
C4: Month
C5: Day
C6: Hour
C7: Minute
C8: Second
C9: Day-of-year
C10: Lat (degN)
C11: Lon (degE)

本数据集的原位拉格朗日漂流浮标（Lagrangian drifter）位置数据源自9个一次性海冰浮标（expendable sea-ice buoys）。各浮标搭载的GPS接收机（GPS receiver）采集位置信息，并通过CLS Argos卫星数据系统（CLS Argos satellite data system）中继传输。

本项目的科学方案原计划在SIPEX 2012试验区的大陆架坡折（continental shelf break）处部署两套中尺度浮标阵列（meso-scale buoy arrays）。获取大陆架及大陆架坡折区域的海冰运动数据，可为海冰变形与冰体强度研究提供关键支撑。但由于巡航航线条件不佳，且直升机保障存在作业问题，最终未能部署任何中尺度浮标阵列。转而在更广范围的SIPEX 2012试验区内布设浮标以获取海冰变形相关数据。

多数浮标的位置数据以每小时1次的频率更新。CLS Argos卫星数据系统传输的数据存在一处数据传输盲区，该时段紧邻当地无数据可用的时刻。

数据处理流程将参照Heil等人2008年的文献所述方法执行。

本数据集由各浮标的ASCII文件（ASCII file）构成，文件包含时间戳与观测得到的纬度、经度信息。各文件的列（以C标识）格式如下：
C1：项目标识
C2：浮标标识
C3：年份
C4：月份
C5：日期
C6：小时
C7：分钟
C8：秒
C9：年积日（Day-of-year）
C10：纬度（北纬，单位：度）
C11：经度（东经，单位：度）