Sub-bottom profiling data from expedition SAS, Arctic Ocean, 2021

Julia Muchowski, Carlos Castro, Caroline Bringensparr, Alexandra Padilla, Serdar Sakinan, Pauline Snoeijs Leijonmalm, Christian Stranne, Martin Jakobsson

This dataset contains sub-bottom profiling data from the Central Arctic Ocean, acquired using a Kongsberg chirp sonar installed onboard icebreaker Oden.

Sub-bottom profiling data can be used to observe the stratigraphy of the sediment, which was the main purpose of collecting this dataset.

Data were collected from Swedish icebreaker Oden during the Synoptic Arctic Survey (SAS) expedition to the central Arctic Ocean, from late July to mid September 2021.

Citation

Julia Muchowski, Carlos Castro, Caroline Bringensparr, Alexandra Padilla, Serdar Sakinan, Pauline Snoeijs Leijonmalm, Christian Stranne, Martin Jakobsson (2024) Sub-bottom profiling data from expedition SAS, Arctic Ocean, 2021. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/oden-sas-2021-subbottom-1

References

Snoeijs-Leijonmalm Pauline, the SAS-Oden Scientific Party (2022) Expedition Report SWEDARCTIC: Synoptic Arctic Survey 2021 with icebreaker Oden. Swedish Polar Research Secretariat, 300 pp, ISBN 978-91-519-3672-7

Data description

File types

Sub-bottom profile data are provided in two data formats; in original Kongsberg raw format (.raw) and in SEGY format (.seg), which is obtained after conversion from the original format using the Kongsberg Topas software. The SEGY files include navigation data (lat, lon in arcseconds).

Dataset structure

Data files are provided in one zip file with two main folders named raw and seg. These folders are further structured in subfolders for each day. File names include day and time when data were collected.

Because of the large data volume (42 GiB compressed; 48 GiB, 785 files uncompressed), downloading can take can take long time and requires sufficent disk space on your system.

Notes

• Some files were originally given illogical names by the measurement system. This occurs in raw and seg subfolders named 20210914 and 20210916. The original file names are left unchanged.
• Some files are placed in subfolders with names that correspond to a date one or a few days before the date indicated by the file name. This occurs in several raw and seg subfolders.

Comments

The data were collected in summer 2021 from Swedish icebreaker Oden during the Synoptic Arctic Survey (SAS) 2021 expedition organized by the Swedish Polar Research Secretariat.

Sub-bottom data were acquired using the Kongsberg SBP 120 Sub-Bottom Profiler (2⁠ – ⁠7 kHz; 3° × 3°) chirp sonar installed onboard icebreaker Oden:

• Pulse: 2.5⁠ – ⁠7 kHz chirp
• Navigation data: GPS from Seatex Seapath 330 (data included in SEGY files)
• Depth reference: Depth underneath transducer located 8 m below sea level.

The measurement equipment was running throughout the expedition. Thus, data were collected along the ship track but there are some gaps at the beginning of the expedition.