Globcurrent: Sentinel-3 synergy in action

Johannessen, JA; Chapron, B; Collard, F; Rio, M-H; Piollé, J-F; Quartly, GD; Shutler, J; Escola, R; Donlon, CJ; Danielson, R; Korosov, A; Raj, RP; Kudryavtsev, V; Roca, M; Tournadre, J; Larnicol, G; Labroue, S; Miller, PI; Nencioli, F; Warren, M; Hansen, M. 2015 Globcurrent: Sentinel-3 synergy in action. Proceedings of Sentinel-3 for Science Workshop (2-5 June 2015, Venice, Italy), SP-734. 6, pp.

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Abstract/Summary

The ESA Data User Element (DUE) funded GlobCurrent project (http://www.globcurrent.org) aims to: (i) advance the quantitative estimation of ocean surface currents from satellite sensor synergy; and (ii) demonstrate impact in user-led scientific, operational and commercial applications that, in turn, will improve and strengthen the uptake of satellite measurements. Today, a synergetic approach for quantitative analysis can build on high-resolution imaging radar and spectrometer data, infrared radiometer data and radar altimeter measurements. It will further integrate Sentinel-3 in combination with Sentinel-1 SAR data. From existing and past missions, it is often demonstrated that sharp gradients in the sea surface temperature (SST) field and the ocean surface chlorophyll-a distribution are spatially correlated with the sea surface roughness anomaly fields at small spatial scales, in the sub-mesocale (1-10 km) to the mesoscale (30-80 km). At the larger mesoscale range (>50 km), information derived from radar altimeters often depict the presence of coherent structures and eddies. The variability often appears largest in regions where the intense surface current regimes (>100 - 200 km) are found. These 2-dimensional structures manifested in the satellite observations represent evidence of the upper ocean (~100-200 m) dynamics. Whereas the quasi geostrophic assumption is valid for the upper ocean dynamics at the larger scale (>100 km), possible triggering mechanisms for the expressions at the mesoscale-to-submesoscale may include spiraling tracers of inertial motion and the interaction of the wind-driven Ekman layer with the quasi-geostrophic current field. This latter, in turn, produces bands of downwelling (convergence) and upwelling (divergence) near fronts. A regular utilization of the sensor synergy approach with the combination of Sentinel-3 and Sentinel-1 will provide a highly valuable data set for further research and development to better relate the 2-dimensional surface expressions and the upper ocean dynamics.

Item Type: Publication - Article
Subjects: Earth Observation - Remote Sensing
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Sea from Space
Depositing User: Graham Quartly
Date made live: 29 Mar 2016 11:06
Last Modified: 06 Jun 2017 16:16
URI: http://plymsea.ac.uk/id/eprint/6986

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