Preprints
https://doi.org/10.5194/essd-2021-334
https://doi.org/10.5194/essd-2021-334

  13 Oct 2021

13 Oct 2021

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

Improved BEC SMOS Arctic Sea Surface Salinity product v3.1

Justino Martínez1, Carolina Gabarró1, Antonio Turiel1, Verónica González-Gambau1, Marta Umbert1, Nina Hoareau1, Cristina González-Haro1, Estrella Olmedo1, Manuel Arias2, Rafael Catany2, Laurent Bertino3, Roshin P. Raj3, Jiping Xie3, Roberto Sabia4, and Diego Fernández5 Justino Martínez et al.
  • 1Barcelona Expert Center (BEC) and Institute of Marine Sciences (ICM), CSIC, P. Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain
  • 2ARGANS, Derriford, PL6 8BX Plymouth, U.K.
  • 3Nansen Environmental and Remote Sensing Center- NERSC, Jahnebakken 3, N-5007 Bergen, Norway
  • 4Telespazio-Vega UK Ltd., for ESA-ESRIN, Largo Galileo Galilei 1, 00044 Frascati, Italy
  • 5ESA-ESRIN, Largo Galileo Galilei 1, 00044 Frascati, Italy

Abstract. Measuring salinity from space is challenging since the sensitivity of the brightness temperature (TB) to sea surface salinity (SSS) is low (about 0.5 K / psu), while the SSS range in the open ocean is narrow (about 5 psu, if river discharge areas are not considered). This translates into a high accuracy requirement of the radiometer (about 2–3 K). Moreover, the sensitivity of the TB to SSS at cold waters is even lower (0.3 K / psu), making the retrieval of the SSS in the cold waters even more challenging. Due to this limitation, ESA launched a specific initiative in 2019, the Arctic+Salinity project (AO/1-9158/18/I-BG), to produce an enhanced Arctic SSS product with better quality and resolution than the available products. This paper presents the methodologies used to produce the new enhanced Arctic SMOS SSS product (Martínez et al., 2020) . The product consists of 9-day averaged maps in an EASE 2.0 grid of 25 km. The product is freely distributed from the Barcelona Expert Center (BEC, http://bec.icm.csic.es/) with the DOI number: 10.20350/digitalCSIC/12620. The major change in this new product is its improvement of the effective spatial resolution that permits better monitoring of the mesoscale structures (larger than 50 Km), which benefits the river discharges monitoring.

Justino Martínez et al.

Status: open (until 08 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-334', Anonymous Referee #1, 18 Oct 2021 reply

Justino Martínez et al.

Data sets

BEC SMOS Arctic SSS v3.1 Justino Martínez, Carolina Gabarró, Antonio Turiel https://doi.org/10.20350/digitalCSIC/12620

Justino Martínez et al.

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Short summary
Measuring salinity from space is challenging since the sensitivity of the brightness temperature to sea surface salinity is low, but this is even more challenging the retrieval of the SSS in the cold waters. In 2019, ESA launched a specific initiative called Arctic+Salinity to produce an enhanced Arctic SSS product with better quality and resolution than the available products. This paper presents the methodologies used to produce the new enhanced Arctic SMOS SSS product.