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Journal Articles Remote Sensing Year : 2019

Retrieval of Snow Properties from the Sentinel-3 Ocean and Land Colour Instrument

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Alexander Kokhanovsky
  • Function : Author
Olaf Danne
  • Function : Author
Carsten Brockmann
Marie Dumont
Biagio Di Mauro
  • Function : Author
Teruo Aoki
Masashi Niwano
Vladimir Rozanov
  • Function : Author
Sergey Korkin
  • Function : Author
Sepp Kipfstuhl
  • Function : Author
Johannes Freitag
  • Function : Author
Maria Hoerhold
  • Function : Author
Alexandra Zuhr
  • Function : Author
Diana Vladimirova
  • Function : Author
Anne-Katrine Faber
Hans Steen-Larsen
Sonja Wahl
Jonas Andersen
  • Function : Author
Baptiste Vandecrux
Dirk van As
Kenneth Mankoff
Michael Kern
  • Function : Author
Eleonora Zege
  • Function : Author
Jason Box
  • Function : Author

Abstract

The Sentinel Application Platform (SNAP) architecture facilitates Earth Observation data processing. In this work, we present results from a new Snow Processor for SNAP. We also describe physical principles behind the developed snow property retrieval technique based on the analysis of Ocean and Land Colour Instrument (OLCI) onboard Sentinel-3A/B measurements over clean and polluted snow fields. Using OLCI spectral reflectance measurements in the range 400–1020 nm, we derived important snow properties such as spectral and broadband albedo, snow specific surface area, snow extent and grain size on a spatial grid of 300 m. The algorithm also incorporated cloud screening and atmospheric correction procedures over snow surfaces. We present validation results using ground measurements from Antarctica, the Greenland ice sheet and the French Alps. We find the spectral albedo retrieved with accuracy of better than 3% on average, making our retrievals sufficient for a variety of applications. Broadband albedo is retrieved with the average accuracy of about 5% over snow. Therefore, the uncertainties of satellite retrievals are close to experimental errors of ground measurements. The retrieved surface grain size shows good agreement with ground observations. Snow specific surface area observations are also consistent with our OLCI retrievals. We present snow albedo and grain size mapping over the inland ice sheet of Greenland for areas including dry snow, melted/melting snow and impurity rich bare ice. The algorithm can be applied to OLCI Sentinel-3 measurements providing an opportunity for creation of long-term snow property records essential for climate monitoring and data assimilation studies—especially in the Arctic region, where we face rapid environmental changes including reduction of snow/ice extent and, therefore, planetary albedo.
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Dates and versions

meteo-03657917 , version 1 (03-05-2022)

Licence

Attribution - CC BY 4.0

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Alexander Kokhanovsky, Maxim Lamare, Olaf Danne, Carsten Brockmann, Marie Dumont, et al.. Retrieval of Snow Properties from the Sentinel-3 Ocean and Land Colour Instrument. Remote Sensing, 2019, 11 (19), pp.2280. ⟨10.3390/rs11192280⟩. ⟨meteo-03657917⟩
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