Citation:

PANGAEA.931908

Name: Current velocity measurements from upward-looking ADCP at Qikiqtaruk during the Yukon Coast 2018 expedition of the AWI
Published: 2021-05-28
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Acoustic Current Doppler Profiler; ADCP; ADCP data; Arctic Ocean; Arctic Shelf; Beaufort Sea; Coastal erosion; Current Direction; currents; current velocity; Herschel Island; hydrodynamics; Nearshore zone; Permafrost; Qikiqtaruk; Yukon Coast

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Abstract:

The dataset compiles water current velocities and direction measured by a platform-based upward looking Acoustic Doppler Current Profiler. Data was acquired in August 2018 during the Yukon Coast 2018 expedition to the Herschel Island – Qikiqtaruk coastal observatory, conducted by the Alfred Wegener Institute in Potsdam, Germany. Goal of this project was to find drivers that control nearshore currents and to map their spatio-temporal variation. These currents might play an important role in the transport process of sediments and organic matter in the nearshore zone of the Arctic Ocean. The sediments mainly originate from the rapidly eroding permafrost coasts. The columns of this data file include Date/Time, height above the seafloor of the respective measurement cell (bin), current velocity in east-west direction and current velocity in north-south direction.

Keyword(s):

Acoustic Current Doppler Profiler; ADCP; ADCP data; Arctic Ocean; Arctic Shelf; Beaufort Sea; Coastal erosion; Current Direction; currents; current velocity; Herschel Island; hydrodynamics; Nearshore zone; Permafrost; Qikiqtaruk; Yukon Coast

Project(s):

NUNATARYUK, Permafrost thaw and the changing Arctic coast, science for socioeconomic adaptation (NUNATARYUK)

Permafrost Research (AWI_Perma)

Funding:

Horizon 2020 (H2020), grant/award no. 773421 : NUNATARYUK, Permafrost thaw and the changing Arctic coast, science for socioeconomic adaptation

Coverage:

Latitude: 69.465833 * Longitude: -139.030555

Date/Time Start: 2018-08-04T00:00:00 * Date/Time End: 2018-08-18T00:00:00

Minimum Elevation: -7.0 m * Maximum Elevation: -7.0 m

Event(s):

YC_2018_ADCP * Latitude: 69.465833 * Longitude: -139.030555 * Date/Time Start: 2018-08-04T00:00:00 * Date/Time End: 2018-08-18T00:00:00 * Elevation: -7.0 m * Location: Beaufort Sea * Campaign: (Yukon_Coast_2018) * Basis: AWI Arctic Land Expedition * Method/Device: * Comment: Nearshore current measurement with an ADCP

Comment:

Data description:

Setting: 4 Beam in 20 degree Janus configuration

Deployment location: Latitude 69.465833 N / Longitude 139.030555 W

Depth: ca. 7 meter - (varying with sea level)

Number of cells (bins): 14

Bin size: 0.50 meter

First bin: 1.60 meter

Measurements per hour: 60

Pings per Ensemble: 50

Time/Ping: 1.20 s

Data is given in "oceanographic convention" (i.e. the direction the current is directed to)

Pre- and post-processing steps:

Step 1 - Calibration of the instrument by following the calibration setup in the software (RD Instrument WinSC)

Step 2 – Definition of planned deployment schedule and parameterization of the device (RD Instrument WinSc + RD Instrument PlanADCP)

Step 3 - Deployment of the ADCP with a ZODIAC at the study site using a bottom mooring mounted on a stainless steel plate

Step 4 - Retrieval of the instrument after 14 days

Step 5 - Download of the collected data

Step 6 - Opening of the data files with RDI Velocity

Step 7 – Adjustment of the raw data for the following parameters using RDI Velocity software and the corresponding "Velocity Users Guide":

a) Magnetic declination (accessed from https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml#declination; Magnetic declination = 20.16 degree

b) Salinity (average value derived from 2 point measurements through the water column with data ~0.3 meter) analysed from water column profiles retrieved with a handheld CastAway CTD; Salinity = 20.45 ppt (parts per thousand)

c) Speed of sound velocities were recalculated using temperature, salinity and depth

d) Surface boundary: Contaminated upper bins were removed (blank) using the "Range to boundary - Intensity" function of Velocity, to remove measurements that were affected by turbulent air bubbles from wave action.

Step 8 - Exporting the processed files to Matlab using the Velocity Export function; Data right after lowering the mooring system and after retrieving was removed

Step 9 – Writing of txt-file in Matlab (tab delimiter, ISO 8601 date format, UTF-8, missing or removed data is left empty)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Date/Time local	Date/Time local		Gimsa, Justus		Local time in Inuvik, Northwest Territories, Canada (UTC -6h)
2	Height above sea floor/altitude	Height above sea floor	m	Gimsa, Justus		Height above the sea floor in [m] of the respective lower bin boundary (First bin at 1.60m, bin size = 0.50m)
3	Current velocity, east-west	Cur vel U	cm/s	Gimsa, Justus	Acoustic Doppler Current Profiling (ADCP), RDI Workhorse Sentinel, 600 kHz
4	Current velocity, north-south	Cur vel V	cm/s	Gimsa, Justus	Acoustic Doppler Current Profiling (ADCP), RDI Workhorse Sentinel, 600 kHz

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

923306 data points

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