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Comparison of Satellite-Derived Sea Surface Temperature and Sea Surface Salinity Gradients Using the Saildrone California/Baja and North Atlantic Gulf Stream Deployments

by Jorge Vazquez-Cuervo 1,*,†,‡, Jose Gomez-Valdes 2,‡ and Marouan Bouali 3,‡
1
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
2
Physical Oceanography Department, Center for Scientific Research and Higher Education at Ensenada, Ensenada 22860, Baja California, Mexico
3
Institute of Oceanography, University of São Paulo, São Paulo 05508-120, Brazil
*
Author to whom correspondence should be addressed.
Current address: 4800 Oak Grove Dr. M/S 300/323, Pasadena, CA 91109, USA.
These authors contributed equally to this work.
Remote Sens. 2020, 12(11), 1839; https://doi.org/10.3390/rs12111839
Received: 20 April 2020 / Revised: 29 May 2020 / Accepted: 1 June 2020 / Published: 6 June 2020
Validation of satellite-based retrieval of ocean parameters like Sea Surface Temperature (SST) and Sea Surface Salinity (SSS) is commonly done via statistical comparison with in situ measurements. Because in situ observations derived from coastal/tropical moored buoys and Argo floats are only representatives of one specific geographical point, they cannot be used to measure spatial gradients of ocean parameters (i.e., two-dimensional vectors). In this study, we exploit the high temporal sampling of the unmanned surface vehicle (USV) Saildrone (i.e., one measurement per minute) and describe a methodology to compare the magnitude of SST and SSS gradients derived from satellite-based products with those captured by Saildrone. Using two Saildrone campaigns conducted in the California/Baja region in 2018 and in the North Atlantic Gulf Stream in 2019, we compare the magnitude of gradients derived from six different GHRSST Level 4 SST (MUR, OSTIA, CMC, K10, REMSS, and DMI) and two SSS (JPLSMAP, RSS40km) datasets. While results indicate strong consistency between Saildrone- and satellite-based observations of SST and SSS, this is not the case for derived gradients with correlations lower than 0.4 for SST and 0.1 for SSS products. View Full-Text
Keywords: ocean fronts; sea surface temperature/salinity gradients; satellite observations; Saildrone ocean fronts; sea surface temperature/salinity gradients; satellite observations; Saildrone
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Vazquez-Cuervo, J.; Gomez-Valdes, J.; Bouali, M. Comparison of Satellite-Derived Sea Surface Temperature and Sea Surface Salinity Gradients Using the Saildrone California/Baja and North Atlantic Gulf Stream Deployments. Remote Sens. 2020, 12, 1839.

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