Fer, Ilker; Reifenberg, Simon F; Elliott, Fiona; Allerholt, Jacob; Hoppmann, Mario; von Appen, Wilken-Jon; Kanzow, Torsten (2024): Raw and converted data from under-ice turbulence measurements using an ice-mounted 5-beam ADCP deployed during the RV POLARSTERN cruise PS131 ATWAICE to the Arctic marginal ice zone in July 2022 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.964900

High-resolution observations of under ice currents were collected using a 5-beam acoustic Doppler current profiler (ADCP) during the RV Polarstern cruise PS131 to the Marginal Ice Zone on Yermak Plateau in summer 2022. The Nortek Signature1000 ADCP (SN 100154) was deployed on a drifting ice floe. It was set up with an external 540 Wh Alkaline battery in a storm case. The ADCP was pointing downwards, attached to a rod, protruding approximately 0.5 m below the underside of the ice, which was approximately 1.8 m thick. It was secured with buoyancy. The instrument was deployed in water on 13 July 2022, 15:25 UTC, and recovered on 30 July 2022, 08:05 UTC. A GPS tracker (2022P10017 / 610) was located next to the ADCP, the raw data of this trajectory are archived here: https://doi.pangaea.de/10.1594/PANGAEA.959001 (event PS131_47-1_9). The ADCP has 5 beams (4 in Janus configuration and one vertical beam) and is equipped with the high-resolution (HR) feature giving high-quality pulse-to-pulse coherent profiles for turbulence measurements. We used a concurrent plan with average profiles and bursts using 5 beams. Average profiles were obtained as 60 s averages every 5 minutes with 20% measurement load, starting from 0.2 m from the transducer to 18 m, with 1 m cell sizes. The HR profiles were obtained with 5 cm cell sizes between 0.1 to 2.5 m from the transducers, with 2.85 m pulse distance at maximum power level. Bursts were obtained every 30 minutes at 4 Hz as 4096 (about 17 min) samples, in beam coordinate system. In this configuration horizontal precision is 0.99 cm/s, and vertical precision is 0.33 cm/s for the average profiles. The estimated maximum length of using the provided battery was 67 days. During the second visit of the floe on 20 July 2022, at approximately 20:35 UTC, the instrument was removed from the hole for cleaning the hole and placed back in a similar heading orientation. This action is visible in the time series of pressure, pitch, and heading. The dataset includes the data downloaded from the instrument in its native binary format as well as the data converted into physical units using Nortek's Signature Deployment software. The converted data are provided in MATLAB format, exported using the Signature Deployment software. This software, the instrument setup file and the configuration files are also provided.

The deployment of the device happened during the ice station with event PS131_47-1. The adjustment of the instrument happened during the ice station with the event PS131_67-1. The instrument was recovered during the ice station with the event PS131_89-1.