Preprints
https://doi.org/10.5194/essd-2021-364
https://doi.org/10.5194/essd-2021-364

  18 Nov 2021

18 Nov 2021

Review status: this preprint is currently under review for the journal ESSD.

New SMOS SSS maps in the framework of the Earth Observation data For Science and Innovation in the Black Sea

Estrella Olmedo1, Verónica González-Gambau1, Antonio Turiel1, Cristina González-Haro1, Aina García-Espriu1, Marilaure Gregoire2, Aida Álvera-Azcárate2, Luminita Buga3, and Marie-Hélène Rio4 Estrella Olmedo et al.
  • 1Barcelona Expert Center (BEC) and Institute of Marine Sciences (ICM), CSIC, P. Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain
  • 2University of Liege
  • 3National Institute for Marine Research and Development Grigore Antipa
  • 4European Space Agency

Abstract. In the framework of the European Space Agency (ESA) regional initiative called Earth Observation data For Science and Innovation in the Black Sea (EO4SIBS), a new dedicated Soil Moisture and Ocean Salinity (SMOS) Sea Surface Salinity (SSS) product is generated for the Black Sea for the years 2011–2020. Three SMOS SSS fields are retrieved and distributed: a level 2 product consisting of binned SSS in daily maps at 0.25° × 0.25° spatial resolution grid by considering ascending ((Olmedo et al., 2021b), https://doi.org/10.20350/digitalCSIC/13993) and descending ((Olmedo et al., 2021c), https://doi.org/10.20350/digitalCSIC/13995) satellite overpass directions separately; a level 3 product ((Olmedo et al., 2021d), https://doi.org/10.20350/digitalCSIC/13996) consisting of binned SSS in 9-day maps at 0.25° × 0.25° grid by combining as cending and descending satellite overpass directions; and a level 4 product ((Olmedo et al., 2021e), https://doi.org/10.20350/digitalCSIC/13997) consisting of daily maps at 0.05 × 0.0505° that are computed by merging the level 3 SSS product with Sea Surface Temperature (SST) maps. The generation of SMOS SSS fields in the Black Sea requires the use of enhanced data processing algorithms for improving the Brightness Temperatures in the region since this basin is typically strongly affected by Radio Frequency Interference (RFI) sources which hinders the retrieval of salinity. Here, we describe the algorithms introduced to improve the quality of the salinity retrieval in this basin. The validation of the EO4SIBS SMOS SSS products is performed by: i) comparing the EO4SIBS SMOS SSS products with near-to-surface salinity measurements provided by in situ measurements; ii) assessing the geophysical consistency of the products by comparing them with a model and other satellite salinity measurements; iii) computing maps of SSS errors by using Correlated Triple Collocation analysis. The accuracy of the EO4SIBS SMOS SSS products depend on the time period and on the product level. The accuracy in the period 2016–2020 is better than in 2011–2015 and it is as follows for the different products: i) Level 2 ascending: 1.85 / 1.50 psu (in 2011–2015 / 2016–2020); Level 2 descending: 2.95 1.95 psu; ii) Level 3: 0.7 / 0.5 psu; and iii) Level 4: 0.6 / 0.4 psu.

Estrella Olmedo et al.

Status: open (until 13 Jan 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-364', Anonymous Referee #1, 21 Nov 2021 reply
    • AC1: 'Reply on RC1', Estrella Olmedo, 26 Nov 2021 reply

Estrella Olmedo et al.

Data sets

Black Sea SMOS Sea Surface Salinity Level 4 Olmedo, E., González-Gambau, V., González-Haro, C., García-Espriu, A., and Turiel, A. https://doi.org/10.20350/digitalCSIC/13997

Black Sea SMOS Sea Surface Salinity Level 3 Olmedo, E., González-Gambau, V., González-Haro, C., García-Espriu, A., and Turiel, A. https://doi.org/10.20350/digitalCSIC/13996

Black Sea SMOS Sea Surface Salinity Level 2 (descending) Olmedo, E., González-Gambau, V., González-Haro, C., García-Espriu, A., and Turiel, A. https://doi.org/10.20350/digitalCSIC/13995

Black Sea SMOS Sea Surface Salinity Level 2 (ascending) Olmedo, E., González-Gambau, V., González-Haro, C., García-Espriu, A., and Turiel, A. https://doi.org/10.20350/digitalCSIC/13993

Estrella Olmedo et al.

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Short summary
We present the first dedicated satellite salinity product in the Black Sea. We use the measurements provided by the European Soil Moisture and Ocean Salinity mission. We introduce enhanced algorithms for dealing with the contamination produced by the Radio Frequency Interferences that strongly affect this basin. We also provide a complete quality assessment of the new product and give an estimated accuracy of it.