Assessment of Atmospheric Correction Algorithms for Sentinel-3 OLCI in the Amazon River Continuum

Autor(es)

Valerio, Aline M. ; Kampel, Milton ; Vantrepotte, Vincent ; Ballester, Victoria ; Richey, Jeffrey

• Tipo de documento: Artigo Científico
• Fonte: REMOTE SENSING; v. 16, n. 14, p. 23-pg., 2024-07-01.

Resumo

Water colour remote sensing is a valuable tool for assessing bio-optical and biogeochemical parameters across the vast extent of the Amazon River Continuum (ARC). However, accurate retrieval depends on selecting the best atmospheric correction (AC). Four AC processors (Acolite, Polymer, C2RCC, OC-SMART) were evaluated against in situ remote sensing reflectance (R-rs) measurements. K-means classification identified four optical water types (OWTs) that are affected by the ARC. Two OWTs showed seasonal differences in the Lower Amazon River, influenced by the increase in suspended sediment concentration with river discharge. The other OWTs in the Amazon River Plume are dominated by phytoplankton or by a mixture of optically significant constituents. The Quality Water Index Polynomial method used to assess the quality of in situ and orbital R-rs had a high failure rate when the Apparent Visible Wavelength was >580 nm for in situ R-rs. OC-SMART R-rs products showed better spectral quality compared to R-rs derived from other AC processors evaluated in this study. These results improve our understanding of remotely sensing very turbid waters, such as those in the Amazon River Continuum. (AU)

• Processo FAPESP: 21/04128-8 - Caracterização da evolução da qualidade biogeoquímica das águas costeiras brasileiras nas últimas duas décadas a partir da observação de satélites: impacto de forçantes naturais e antrópicas
• Beneficiário: Milton Kampel
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/08148-0 - Variabilidade espaço-temporal do pCO2 no Rio Amazonas por sensoriamento remoto da cor da água: do rio à pluma
• Beneficiário: Aline de Matos Valerio
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/18491-4 - Pontos cegos biogeoquímicos ao longo do continuum do baixo Rio Amazonas: da terra para a atmosfera e oceano
• Beneficiário: Jeffrey Edward Richey
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC