Near-surface Current Mapping by Shipboard Marine X-band Radar: A Validation

Near-surface Current Mapping by Shipboard Marine X-band Radar: A Validation AbstractThe Lagrangian Submesoscale Experiment (LASER) involved the deployment of ~1000 biodegradable GPS-tracked CARTHE drifters to measure submesoscale upper ocean currents and their potential impact on oil spills. The experiment was conducted from Jan-Feb 2016 in the Gulf of Mexico (GoM) near the Mississippi River mouth, an area characterized by strong submesoscale currents. A HZG marine X-band radar (MR) onboard RV F. G. Walton Smith was used to locate fronts and eddies by their sea surface roughness signatures. The MR data were further processed to yield near-surface current maps at ~500 m resolution up to a maximum range of ~3 km. This study employs the drifter measurements to perform the first comprehensive validation of MR near-surface current maps. For a total of 4130 MR–drifter pairs the root-mean-square error for the current speed is 4 cm s−1 and for the current direction is 12°. The MR samples currents at a greater effective depth than the CARTHE drifters (1-5 m vs. ~0.4 m). The mean MR–drifter differences are consistent with a wave- and wind-driven vertical current profile that weakens with increasing depth and rotates clockwise from the wind direction (by 0.7% of the wind speed and 15°). The technique presented here has great potential in observational oceanography, as it allows research vessels to map the horizontal flow structure, complementing the vertical profiles measured by ADCP. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Atmospheric and Oceanic Technology American Meteorological Society

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0426
D.O.I.
10.1175/JTECH-D-17-0154.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThe Lagrangian Submesoscale Experiment (LASER) involved the deployment of ~1000 biodegradable GPS-tracked CARTHE drifters to measure submesoscale upper ocean currents and their potential impact on oil spills. The experiment was conducted from Jan-Feb 2016 in the Gulf of Mexico (GoM) near the Mississippi River mouth, an area characterized by strong submesoscale currents. A HZG marine X-band radar (MR) onboard RV F. G. Walton Smith was used to locate fronts and eddies by their sea surface roughness signatures. The MR data were further processed to yield near-surface current maps at ~500 m resolution up to a maximum range of ~3 km. This study employs the drifter measurements to perform the first comprehensive validation of MR near-surface current maps. For a total of 4130 MR–drifter pairs the root-mean-square error for the current speed is 4 cm s−1 and for the current direction is 12°. The MR samples currents at a greater effective depth than the CARTHE drifters (1-5 m vs. ~0.4 m). The mean MR–drifter differences are consistent with a wave- and wind-driven vertical current profile that weakens with increasing depth and rotates clockwise from the wind direction (by 0.7% of the wind speed and 15°). The technique presented here has great potential in observational oceanography, as it allows research vessels to map the horizontal flow structure, complementing the vertical profiles measured by ADCP.

Journal

Journal of Atmospheric and Oceanic TechnologyAmerican Meteorological Society

Published: Mar 5, 2018

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