DOI: 10.1594/pangaea.883193
title: Time-averaged profiles and spatial maps of ocean currents from shipboard ADCP measurements at three North Atlantic seamounts between 2004 and 2015

description: Author affiliations:Mohn, Christian: Department of Bioscience, Aarhus University, Denmark;Christiansen, Bernd: Institute for Hydrobiology and Fisheries Science, University of Hamburg;Denda, Anneke: Institute for Hydrobiology and Fisheries Science, University of Hamburg;Christiansen, Svenja: GEOMAR - Helmholtz Centre for Ocean Research Kiel;Kaufmann, Manfred: CIIMAR-Madeira;Peine, Florian: Institute for Biosciences, University of RostockSpringer, Barbara: Institute for Biosciences, University of RostockTurnewitsch, Robert: Scottish Association for Marine Science, UK-----The dataset consists of single profiles and spatially regridded maps of shipboard ADCP data from cruises to Ampère Seamount, Senghor Seamount and Seine Seamount in the North Atlantic.Profile data: 2 minute ensemble averaged profiles of horizontal velocity components (u, v), acoustic backscatter and percent good. The profile data is derived from fully processed and time averaged single ping raw data. Processing was conducted with the CODAS ADCP postprocessing package (https://currents.soest.hawaii.edu/docs/adcp_doc/codas_doc/index.html). Parameters are provided in a column-oriented text format (one column for each parameter). Parameters include: Date (yy-mm-dd), Time (HH:MM:SS), Decimal Day, Longitude (°), Latitude (°), Depth (m), U (m/s), V (m/s), Echo Amplitude (Raw Counts), Percent Good.Available profile data files:ampere2009_p384_os75_profiles.dat (Sampling year: 2009, Cruise: RV Poseidon 384, Instrument: Ocean Surveyor 75 kHz) ampere2010_m832_os38_profiles.dat (Sampling year: 2010, Cruise: RV Meteor 83-2, Instrument: Ocean Surveyor 38 kHz) ampere2010_m832_os75_profiles.dat (Sampling year: 2010, Cruise: RV Meteor 83-2, Instrument: Ocean Surveyor 75 kHz) senghor2009_m793_os38_profiles.dat (Sampling year: 2009, Cruise: RV Meteor 79-3, Instrument: Ocean Surveyor 38 kHz) senghor2013_p446_os75_profiles.dat (Sampling year: 2013, Cruise: RV Poseidon 446, Instrument: Ocean Surveyor 75 kHz) senghor2015_msm49_os75_profiles.dat (Sampling year: 2015, Cruise: RV Maria S Merian 49, Instrument: Ocean Surveyor 75 kHz) seine2004_d282_os75_profiles.dat (Sampling year: 2004, Cruise: RV Discovery 282, Instrument: Ocean Surveyor 75 kHz) seine2009_p384_os75_profiles.dat (Sampling year: 2009, Cruise: RV Poseidon 384, Instrument: Ocean Surveyor 75 kHz) Spatial maps:ADCP velocity profiles were spatially re-gridded for each depth bin in an optimal way using the Matlab interface of the DIVA optimal interpolation and error analysis toolbox (http://modb.oce.ulg.ac.be/mediawiki/index.php/DIVA). The size of the target grid was set to 30 arc seconds (1/120° or approximately 0.5 nautical miles) in latitude and longitude. The spatial correlation length scale was set to 0.2°, which corresponds to a characteristic seamount length scale in all areas. The signal to noise ratio was set to a constant value of order unity (1) to minimize numerical noise in the gridded velocities caused by the spatial resolution mismatch between along- and cross-track ADCP data. The relative error is based on a covariance function and provides confidence estimates for the DIVA interpolated velocity fields. The 30 arc second Smith and Sandwell global topography data set V17.1 was used for masking in areas, where the bottom topography intersects depth levels. Gridded data are provided in the self-describing, platform-independent NetCDF format.Gridded data files:ampere2009_p384_os75_gridded.ncampere2010_m832_os38_gridded.ncampere2010_m832_os75_gridded.ncsenghor2009_m793_os38_gridded.nc senghor2013_p446_os75_gridded.nc senghor2015_msm49_os75_gridded.ncseine2004_d282_os75_gridded.ncseine2009_p384_os75_gridded.nc