Sediment echosounder processed data (Atlas Parasound P70 echosounder working area dataset) of RV MARIA S. MERIAN during cruise MSM45, Labrador Sea

One sediment echosounder profile from the Cartwright trough, a glacial cross-shelf trough of the Labrador Shelf, is presented. The profile was collected on board the Maria S. Merian during the cruise MSM45 using the Teledyne Parasound P70 parametric sub-bottom echosounder mounted on the hull. A secondary low frequency of 4 kHz was used. Data was converted from the PS3 recording format to the SEGY format using the software ps32sgy written by Hanno Keil (University Bremen). The conversion included mean subtraction, time-domain filtering (pass from 2 to 6 kHz) and calculation of envelopes. The objective of data recording on the Labrador Shelf is to map glacial landforms and reconstruct the dynamics of the Laurentide Ice Sheet in detail.本数据集展示了拉布拉多陆架（Labrador Shelf）卡特里特海槽（Cartwright Trough）的沉积物回声测深剖面，该海槽为冰川作用形成的跨陆架海槽。该剖面由Maria S. Merian号考察船在MSM45航次期间采集，搭载于船体的Teledyne Parasound P70参数化次表层回声测深仪完成数据获取，采集过程中使用了4 kHz的次级低频信号。原始数据采用PS3记录格式存储，后由不来梅大学的Hanno Keil开发的ps32sgy软件转换为SEGY格式，转换流程包含均值减除、时域滤波（通带范围2~6 kHz）以及包络计算三个步骤。本次拉布拉多陆架数据采集的核心目标为精细刻画冰川地貌，并详细重建劳伦泰德冰盖（Laurentide Ice Sheet）的动态演化过程。