Cruise Report, RV ATAIR, Cruise 0671021-1, Bremerhaven - Thyboron - Aberdeen, 18 Jul —- 10 Aug 2023 | 45 
SAL 
Blanking Distance [m] 
Maximum Range [m] 
Transducer Depth [m] 
Transducer Angle [°] 
ß 
400 
5 
1.6 
Table. 7.2. Specification of the vessel-mounted Acoustic Doppler Current Profiler (VMADCP) in use 
during cruise 0671021-1. 
During the cruise the VMADCP was operated in narrow-band mode to provide maximum data 
quality. Bin sizes were kept constant to sustain consistency during the cruise, while the bottom 
search threshold was kept constant at 100 m during the southern part of the cruise until Thy- 
boren and at 400 m for the northern part. Detailed parameter settings are listed in Table 7.3. 
The obtained raw data were processed using the CODAS-toolbox “codas_focal_20.04” of the 
School of Ocean and Earth Science and Technology (SOEST), University of Hawaii, USA. 
Details regarding the toolbox are provided on the CODAS web page: https://currents.soest.ha- 
wail.edu/docs/adcp_doc/. Settings and procedures follow recommendations presented by Fir- 
ing and Hummon (2010). 
During the cruise, single-ping editing was not performed due to the lack of sufficient calibration 
data. A full single-ping post-processing has to be done after the cruise and is still pending. 
During the cruise the long-term averaged data (LTA, 5 min averages) were processed. Pro- 
zessing resulted in data sets of zonal and meridional current velocities, distributed over lati- 
tude, longitude, time, depth along the ship track. The processed data were stored in several 
autput files in the native MATLAB format (*.mat) as well as netcdf. Erroneous signals from the 
sea bottom were removed from the data. Overview plots were stored along with the data. 
Data recording started on 18 July 2023 at 17:27 UTC between the test station and the first 
official CTD station. Recording was stopped after finishing transects along latitudes to be able 
to run the data pre-processing. Recording was stopped on 29 July 2023 at 14:05 UTC while 
anchoring off Thyboren Harbour and was restarted on 30 July 2023 at 01:19 UTC for a short 
transect towards the port. The VMADCP recording was stopped on 30 July 2023 at 13:32 UTC 
before crossing the Danish 3 nm limit. After leaving Thyboregn and crossing the 3 nm limit, 
VMADCP data recording started again on 01 August 2023 at 06:40 UTC. Recording was 
stopped after finishing transects along latitudes to be able to run the pre-processing. When 
heading for the port of Aberdeen at the end of the cruise, the VMADCP recording was stopped 
on 10 August 2023 at 06:37 UTC when entering the British 12 nm zone. 
Whenever the VMADCP was restarted, an individual file was created, and the file counter was 
automatically increased. Operation of the VMADCP was manually documented throughout the 
zruise in a log file. Configuration setup-up files were stored along with the data whenever the 
configuration was changed.