Processed line aeromagnetic data over the Thwaites glacier region (2018/19 season)

Aeromagnetic data provides important constraints on the sub-surface geology of a region. This dataset contains aeromagnetic line data collected by the British Antarctic Survey as part of the International Thwaites Glacier Collaboration (ITGC). Data were collected using a caesium magnetometer system, and have been corrected to total field values following the approach laid out by the SCAR ADMAP working group (http://admap.kopri.re.kr/ADMAP-2_SCR_27Aug13.pdf). Across flow flights were generally flown at a constant altitude ~450 m above the ice surface, but data was also collected along draped sections flown along the ice flow direction. In total 9872 km of data is presented, of this 6033 km was collected in the main survey area, while other data was collected on input transit flights. The aircraft used was the BAS aerogeophysicaly equipped twin otter VP-FBL. Data are available in ASCII file format (.xyz).

航空磁测数据可为区域地下地质情况提供关键约束依据。本数据集收录英国南极调查局（British Antarctic Survey）作为国际思韦茨冰川合作项目（International Thwaites Glacier Collaboration, ITGC）的组成部分所采集的航空磁测测线数据。数据采集采用铯磁强计系统（caesium magnetometer system），且已按照南极研究科学委员会（Scientific Committee on Antarctic Research, SCAR）ADMAP工作组制定的方法校正为总场值，校正方法详见文档：http://admap.kopri.re.kr/ADMAP-2_SCR_27Aug13.pdf。横切冰流方向的测线通常以高于冰面约450米的恒定高度开展飞行作业，同时也沿冰流方向采集了沿地形拟合的测段数据。本次共发布总长度达9872千米的测线数据，其中6033千米采集自主调查区域，其余数据则来自往返转运飞行任务。本次调查使用的航空器为搭载航空地球物理探测系统的双水獭VP-FBL飞机，隶属于英国南极调查局。数据集以ASCII文件格式（.xyz）对外提供。