Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI
The Baltic Sea is characterized by large gradients in salinity, high concentrations of colored dissolved organic matter, and a phytoplankton phenology with two seasonal blooms. Satellite retrievals of chlorophyll-a concentration (chl-a) are hindered by the optical complexity of this basin and the re...
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ftdoajarticles:oai:doaj.org/article:1fae5fd7940446a6adc88a349df9060c 2024-02-11T09:54:47+01:00 Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI Luis González Vilas Vittorio Ernesto Brando Annalisa Di Cicco Simone Colella Davide D’Alimonte Tamito Kajiyama Jenni Attila Thomas Schroeder 2024-01-01T00:00:00Z https://doi.org/10.3389/fmars.2023.1256990 https://doaj.org/article/1fae5fd7940446a6adc88a349df9060c EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2023.1256990/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1256990 https://doaj.org/article/1fae5fd7940446a6adc88a349df9060c Frontiers in Marine Science, Vol 10 (2024) ocean color atmospheric correction Baltic Sea Sentinel-3 OLCI chlorophyll-a optically complex waters Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2024 ftdoajarticles https://doi.org/10.3389/fmars.2023.1256990 2024-01-21T01:40:45Z The Baltic Sea is characterized by large gradients in salinity, high concentrations of colored dissolved organic matter, and a phytoplankton phenology with two seasonal blooms. Satellite retrievals of chlorophyll-a concentration (chl-a) are hindered by the optical complexity of this basin and the reduced performance of the atmospheric correction in its highly absorbing waters. Within the development of a regional ocean color operational processing chain for the Baltic Sea based on Sentinel-3 Ocean and Land Colour Instrument (OLCI) full-resolution data, the performance of four atmospheric correction processors for the retrieval of remote-sensing reflectance (Rrs) was analyzed. Assessments based on three Aerosol Robotic Network-Ocean Color (AERONET-OC) sites and shipborne hyperspectral radiometers show that POLYMER was the best-performing processor in the visible spectral range, also providing a better spatial coverage compared with the other processors. Hence, OLCI Rrs spectra retrieved with POLYMER were chosen as input for a bio-optical ensemble scheme that computes chl-a as a weighted sum of different regional multilayer perceptron neural nets. This study also evaluated the operational Rrs and chl-a datasets for the Baltic Sea based on OC-CCI v.6. The chl-a retrievals based on OC-CCI v.6 and OLCI Rrs, assessed against in-situ chl-a measurements, yielded similar results (OC-CCI v.6: R2 = 0.11, bias = −0.22; OLCI: R2 = 0.16, bias = −0.03) using a common set of match-ups for the same period. Finally, an overall good agreement was found between chl-a retrievals from OLCI and OC-CCI v.6 although differences between Rrs were amplified in terms of chl-a estimates. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean color atmospheric correction Baltic Sea Sentinel-3 OLCI chlorophyll-a optically complex waters Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
ocean color atmospheric correction Baltic Sea Sentinel-3 OLCI chlorophyll-a optically complex waters Science Q General. Including nature conservation geographical distribution QH1-199.5 Luis González Vilas Vittorio Ernesto Brando Annalisa Di Cicco Simone Colella Davide D’Alimonte Tamito Kajiyama Jenni Attila Thomas Schroeder Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI |
topic_facet |
ocean color atmospheric correction Baltic Sea Sentinel-3 OLCI chlorophyll-a optically complex waters Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The Baltic Sea is characterized by large gradients in salinity, high concentrations of colored dissolved organic matter, and a phytoplankton phenology with two seasonal blooms. Satellite retrievals of chlorophyll-a concentration (chl-a) are hindered by the optical complexity of this basin and the reduced performance of the atmospheric correction in its highly absorbing waters. Within the development of a regional ocean color operational processing chain for the Baltic Sea based on Sentinel-3 Ocean and Land Colour Instrument (OLCI) full-resolution data, the performance of four atmospheric correction processors for the retrieval of remote-sensing reflectance (Rrs) was analyzed. Assessments based on three Aerosol Robotic Network-Ocean Color (AERONET-OC) sites and shipborne hyperspectral radiometers show that POLYMER was the best-performing processor in the visible spectral range, also providing a better spatial coverage compared with the other processors. Hence, OLCI Rrs spectra retrieved with POLYMER were chosen as input for a bio-optical ensemble scheme that computes chl-a as a weighted sum of different regional multilayer perceptron neural nets. This study also evaluated the operational Rrs and chl-a datasets for the Baltic Sea based on OC-CCI v.6. The chl-a retrievals based on OC-CCI v.6 and OLCI Rrs, assessed against in-situ chl-a measurements, yielded similar results (OC-CCI v.6: R2 = 0.11, bias = −0.22; OLCI: R2 = 0.16, bias = −0.03) using a common set of match-ups for the same period. Finally, an overall good agreement was found between chl-a retrievals from OLCI and OC-CCI v.6 although differences between Rrs were amplified in terms of chl-a estimates. |
format |
Article in Journal/Newspaper |
author |
Luis González Vilas Vittorio Ernesto Brando Annalisa Di Cicco Simone Colella Davide D’Alimonte Tamito Kajiyama Jenni Attila Thomas Schroeder |
author_facet |
Luis González Vilas Vittorio Ernesto Brando Annalisa Di Cicco Simone Colella Davide D’Alimonte Tamito Kajiyama Jenni Attila Thomas Schroeder |
author_sort |
Luis González Vilas |
title |
Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI |
title_short |
Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI |
title_full |
Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI |
title_fullStr |
Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI |
title_full_unstemmed |
Assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the Baltic Sea based on Sentinel-3 OLCI |
title_sort |
assessment of ocean color atmospheric correction methods and development of a regional ocean color operational dataset for the baltic sea based on sentinel-3 olci |
publisher |
Frontiers Media S.A. |
publishDate |
2024 |
url |
https://doi.org/10.3389/fmars.2023.1256990 https://doaj.org/article/1fae5fd7940446a6adc88a349df9060c |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Frontiers in Marine Science, Vol 10 (2024) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2023.1256990/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1256990 https://doaj.org/article/1fae5fd7940446a6adc88a349df9060c |
op_doi |
https://doi.org/10.3389/fmars.2023.1256990 |
container_title |
Frontiers in Marine Science |
container_volume |
10 |
_version_ |
1790604355038085120 |