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Article Dans Une Revue Remote Sensing Année : 2019

Sea Surface Temperature in Global Analyses: Gains from the Copernicus Imaging Microwave Radiometer

Résumé

Sea surface temperatures (SSTs) derived from passive microwave (PMW) observations benefit global ocean and SST analyses because of their near-all-weather availability. Present PMW SSTs have real aperture-limited spatial resolution in excess of 50 km, limiting the spatial fidelity with which SST features, reflecting ocean dynamics, can be captured. This contrasts with the target resolution of global analyses of 5 to 10 km. The Copernicus Imaging Microwave Radiometer (CIMR) is a mission concept under consideration as a high-priority candidate mission for expansion of the Copernicus space programme. This instrument would be capable of real aperture resolution <15 km with low total uncertainties in the range 0.4-0.8K for channels between 1.4 and 36.5 GHz and a dualview arrangement that further reduces noise. This paper provides a comparative study of SST uncertainty and feature resolution with and without the availability of CIMR in the future SSTobserving satellite constellation, based on a detailed simulation of CIMR plus infra-red observations and the processing of global SST analyses with 0.05° final grid resolution. Simulations of CIMR data including structured errors were added to an observing system consisting of the Sea and Land Surface Radiometer (SLSTR) on Sentinel-3A and the Advanced Very High Resolution Radiometer (AVHRR) on MetOp-A. This resulted in a large improvement in the global RMSE for SST from 0.37K to 0.21K for January and 0.34K to 0.23K for July. There was a particularly noticeable improvement in the performance of the analysis, as measured by the reduction in RMSE, for dynamical and persistently cloudy areas. Of these, the Aghulas current showed an improvement of 43% in January and 48% in July, the Gulf Stream 70% and 44%, and the Maritime Continent 50% and 40%.
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Dates et versions

hal-02389453 , version 1 (13-12-2020)

Identifiants

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Kevin Pearson, Simon Good, Christopher Merchant, Catherine Prigent, Owen Embury, et al.. Sea Surface Temperature in Global Analyses: Gains from the Copernicus Imaging Microwave Radiometer. Remote Sensing, 2019, 11 (20), pp.2362. ⟨10.3390/rs11202362⟩. ⟨hal-02389453⟩
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