A robust framework for comparing Lagrangian and gridded Eulerian velocity fields: an example application to surface drifters and altimetry-derived surface currents
- 1Laboratoire d’Océanographie Physique et Spatiale, Univ. Brest CNRS IRD Ifremer, Brest, France
- 2Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
- 1Laboratoire d’Océanographie Physique et Spatiale, Univ. Brest CNRS IRD Ifremer, Brest, France
- 2Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
Abstract. A novel framework for comparing Lagrangian and gridded Eulerian velocity fields is proposed. The method involves three steps that individually leverage the strengths of each reference frame to provide robust intercomparisons, while also allowing the user to adapt the individual steps to the process of interest. The utility of the methodology is then demonstrated by applying it to a comparison between a set of 34 Lagrangian surface drifters deployed on the continental shelf around the southern tip of Greenland and Eulerian altimetry-derived surface currents with and without Ekman velocities. We conclude that the methodology sufficiently addresses differences between the reference frames and accurately identifies errors when they exist. This result enables us to conclude that the altimetry-derived surface currents accurately resolve the important components of the shelf circulation around the southern tip of Greenland and can be used to track pathways of fresh water around Greenland.
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Arthur Coquereau and Nicholas P. Foukal
Status: open (until 27 Feb 2023)
Arthur Coquereau and Nicholas P. Foukal
Data sets
Global Ocean Gridded L4 Sea Surface Heights And Derived Variables Nrt EU Copernicus Marine Service https://doi.org/10.48670/moi-00149
Global Total Surface and 15m Current (COPERNICUS-GLOBCURRENT) from Altimetric Geostrophic Current and Modeled Ekman Current Processing EU Copernicus Marine Service https://doi.org/10.48670/moi-00049
Arctic Ocean Physics Analysis and Forecast Sakov, P., Counillon, F., Bertino, L., Lisæter, K. A., Oke, P. R. and Korablev, A. https://doi.org/10.48670/moi-00001
Global Drifter Program quality-controlled 6-hour interpolated data Lumpkin, R. and Centurioni, L. https://doi.org/10.25921/7ntx-z961
Global Ocean Gridded L 4 Sea Surface Heights And Derived Variables Reprocessed 1993 Ongoing EU Copernicus Marine Service https://doi.org/10.48670/moi-00148
Global Total Surface and 15m Current (COPERNICUS-GLOBCURRENT) from Altimetric Geostrophic Current and Modeled Ekman 440 Current Reprocessing EU Copernicus Marine Service https://doi.org/10.48670/moi-00050
Arthur Coquereau and Nicholas P. Foukal
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