Under-ice current and turbulence measurements at Ice Ridge Observatory during MOSAiC from 2x Nortek Signature1000 Acoustic Doppler profilers

Two Nortek Signature1000 acoustic Doppler current profilers (SN 100098 & SN 101048) were deployed as part of the Sea Ice Ridge Observatory (also called Fort Ridge) in the Arctic Ocean during the 2nd leg of the MOSAiC ice drift expedition in February 2020. The ADCPs are autonomous instruments that measured ice-relative horizontal and vertical ocean currents and turbulence in the upper ~20 m of the water column. The instruments were deployed under the ice, pointing downward on either side of a large ice ridge. In addition to currents, temperature, pressure, tilt, and compass direction were measured. Both instruments were eventually lost due to ice rafting, resulting in one time series between January 3rd and May 6th2020 and one between January 3rd and February 21st, 2020. Here we describe the instrument hardware, setup, and processing that resulted in the final data set. The instruments were deployed as part of the project Ridges - Safe HAVens for ice-associated Flora and Fauna in a Seasonally ice-covered Arctic OCean (HAVOC), funded by the Research Council of Norway, project number: 280292.

2020年2月，北极海冰脊观测站（Sea Ice Ridge Observatory，亦称Fort Ridge）作为MOSAiC冰漂移科考航次第二航段的组成部分，于北冰洋部署了两台Nortek Signature1000型声学多普勒流速剖面仪（acoustic Doppler current profiler，ADCP，序列号分别为SN 100098与SN 101048）。该ADCP为自主观测设备，可测量水柱上层约20米范围内与冰体相对的水平、垂直海流及湍流。两台设备均部署于海冰下方，分别朝向大型冰脊两侧向下观测。除海流参数外，设备还同步测量水温、压强、倾斜度及罗盘方位。后因冰筏漂移，两台设备最终丢失，由此得到两段时间序列数据：一段覆盖2020年1月3日至5月6日，另一段覆盖2020年1月3日至2月21日。本文详述了用于生成最终数据集的设备硬件配置、部署方案及数据处理流程。本设备部署隶属于挪威研究理事会资助的项目"Ridges - Safe HAVens for ice-associated Flora and Fauna in a Seasonally ice-covered Arctic Ocean（HAVOC）"，项目编号为280292。