https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/Head https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://www.nanopub.org/nschema#hasAssertion https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/assertion https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://www.nanopub.org/nschema#hasProvenance https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/provenance https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://www.nanopub.org/nschema#hasPublicationInfo https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/pubinfo https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.nanopub.org/nschema#Nanopublication https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/assertion https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/dc/terms/subject http://www.wikidata.org/entity/Q133878 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/dc/terms/subject http://www.wikidata.org/entity/Q199687 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/dc/terms/subject http://www.wikidata.org/entity/Q4302480 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/dc/terms/subject http://www.wikidata.org/entity/Q47053 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/dc/terms/subject http://www.wikidata.org/entity/Q625376 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/dc/terms/subject http://www.wikidata.org/entity/Q898574 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/spar/cito/isSupportedBy https://w3id.org/sciencelive/np/RAGe9U1qrzbrHI6bZjkM7d3vuwbAkv5j1K0S5cEC8HYkk https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://purl.org/spar/cito/isSupportedBy https://w3id.org/sciencelive/np/RAoh82dxkJvR73OU_ttKf2_mtwgXY5_8qgcp3S7tmhcVM https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://schema.org/endDate 2026-07-25 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://www.w3.org/1999/02/22-rdf-syntax-ns#type https://w3id.org/sciencelive/o/terms/Research-Synthesis https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde http://www.w3.org/2000/01/rdf-schema#label Open-source Sentinel-2 reproduces the parameter-dependent water-quality retrieval asymmetry in the Westerschelde https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde https://w3id.org/sciencelive/o/terms/hasConditionsDescription This synthesis holds within the following scope: - Domain and site: a turbid, mesotidal, well-mixed temperate estuary — the Westerschelde (Netherlands). It generalises to comparable optically complex Case-2 estuaries, not to clear open-ocean (Case-1) water. - Processing chain: the fully open-source Acolite atmospheric correction with the Gons et al. (2005) red-edge algorithm for chlorophyll-a (aGS) and the Nechad et al. (2010) algorithm for turbidity (aN783). This is NOT the paper's proprietary C2RCC chain (cGS / cN783); the synthesis compares an open-source chain against the paper's proprietary result and does not re-run C2RCC. - Sensor and period: Sentinel-2 MSI (A/B/C era), imagery 2016–2026. - Reference: coincident Rijkswaterstaat in situ observations at along-axis stations; turbidity compared in linear space (FNU on both sides, no unit conversion), chlorophyll-a compared in log10 space, matching the paper's treatment of each. - Sample sizes: small — turbidity N = 11 match-ups, chlorophyll-a N = 33. The direction of each verdict is robust; precise magnitudes carry wide uncertainty. - Design: a Replication (different site, different period, open-source processor), not a Reproduction — the Sado in situ data are not public. - Out of scope: grid-sensitivity of the retrieval (a HEALPix / DGGS GRID4EARTH representation of the corrected fields) is deferred to a separate follow-up chain that will extend this one; the primary validation stays on the native Sentinel-2 grid. https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde https://w3id.org/sciencelive/o/terms/hasLimitationsDescription 1. Not a head-to-head processor test. The paper's headline numbers (cGS R² = 0.63, cN783 R² = 0.84) are the proprietary C2RCC chain, which was never run here (C2RCC exists only inside ESA SNAP and crashes in the container). The synthesis compares an open-source chain against the paper's published proprietary result; it does not prove the open-source chain equals C2RCC on the same imagery. In particular, the finding that open-source Acolite matches C2RCC for turbidity is a single-site observation, not a general claim that Acolite outperforms C2RCC everywhere. 2. Small samples. With N = 11 (turbidity) and N = 33 (chlorophyll-a), each R² carries a wide confidence interval. The composed asymmetry is qualitatively robust across the two limbs; the exact R² values should not be over-read. 3. Single estuary, single reference network. Both limbs were validated in one Westerschelde record against one in situ provider. Whether the parameter-dependent asymmetry holds in structurally different estuaries, or against other reference networks, was not tested here. 4. Retrieval bias not corrected. The turbidity retrieval carries a slight positive bias (+6.91 FNU) and the chlorophyll-a retrieval a positive bias with a negative slope; these are reported, not corrected, and would matter for any quantitative use. 5. Grid representation untested. Any sensitivity of these verdicts to spatial re-gridding (HEALPix / DGGS) is explicitly out of scope and deferred to a follow-up chain. https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde https://w3id.org/sciencelive/o/terms/hasRecommendationDescription 1. Do not treat "Sentinel-2 water-quality retrieval" as a single capability. Validate and report accuracy per parameter: a chain trustworthy for turbidity can be simultaneously unreliable for chlorophyll-a in the same water. 2. For estuarine turbidity monitoring (e.g. Water Framework Directive reporting), a fully open-source Acolite + Nechad chain is a viable, citable alternative to the proprietary C2RCC processor — here it matched and slightly exceeded the proprietary result in a different estuary. 3. For estuarine chlorophyll-a, treat MSI retrievals in turbid Case-2 water as provisional. The paper's call for "a more complete set of match-ups" stands; collect more coincident in situ pairs and validate locally before any operational use, and do not assume a red-edge algorithm is tracking pigment rather than backscatter. 4. Prefer open-source, operationally reproducible processing chains for replication and monitoring: they make the retrieval auditable end-to-end and, on the turbidity limb here, cost nothing in accuracy. https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde https://w3id.org/sciencelive/o/terms/hasSynthesisDescription Sent et al. (2021) reported that Sentinel-2 MSI retrieves estuarine water-quality parameters with parameter-dependent accuracy — strong for turbidity, weak for chlorophyll-a. This synthesis composes two independent replication limbs and finds that the asymmetry itself is what replicates. In an independent, more turbid estuary (the Westerschelde) and with a fully open-source atmospheric-correction chain (Acolite), the two parameters behave exactly as the paper's asymmetry predicts, but they land on opposite verdicts. The turbidity limb CONFIRMS the paper: the open-source Acolite + Nechad (aN783) chain retrieves in situ turbidity in strong agreement, R² = 0.92 with a near-unity slope (0.86), meeting and slightly exceeding the paper's proprietary C2RCC + Nechad (cN783) result of R² = 0.84. The chlorophyll-a limb QUALIFIES the paper's own caution: the open-source Acolite + Gons (aGS) chain achieves no useful agreement with in situ chlorophyll-a, R² = 0.10 (log10 space), far below the paper's selected C2RCC + Gons (cGS) result of R² = 0.63, deepening rather than resolving the weakness the original authors flagged. The composed, replicated result is therefore not a single accuracy number but a structural property: Sentinel-2 water-quality retrieval accuracy is parameter-dependent, and that dependence survives both a change of estuary and the replacement of the proprietary processor by an open-source one. https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/provenance https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/assertion http://www.w3.org/ns/prov#wasAttributedTo https://orcid.org/0000-0002-1784-2920 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/pubinfo https://orcid.org/0000-0002-1784-2920 http://xmlns.com/foaf/0.1/name Anne Fouilloux https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://purl.org/dc/terms/created 2026-07-25T16:49:06.935Z https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://purl.org/dc/terms/creator https://orcid.org/0000-0002-1784-2920 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://purl.org/dc/terms/license https://creativecommons.org/licenses/by/4.0/ https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://purl.org/nanopub/x/introduces https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sentinel2-parameter-asymmetry-open-source-westerschelde https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://purl.org/nanopub/x/wasCreatedAt https://platform.sciencelive4all.org https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s http://www.w3.org/2000/01/rdf-schema#label Open-source Sentinel-2 reproduces the parameter-dependent water-quality retrieval asymmetry in the Westerschelde https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s https://w3id.org/np/o/ntemplate/wasCreatedFromTemplate https://w3id.org/np/RApmrqOEr4f5bJC2vayrTnzhwnuEfAU_I4Pdg8K5JxeBw https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sig http://purl.org/nanopub/x/hasAlgorithm RSA https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sig http://purl.org/nanopub/x/hasPublicKey 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 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sig http://purl.org/nanopub/x/hasSignature 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 https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sig http://purl.org/nanopub/x/hasSignatureTarget https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s https://w3id.org/sciencelive/np/RAFOMMXsXiYG-lWxSyjomq6wkhjx4t_BLo01u7Buuif2s/sig http://purl.org/nanopub/x/signedBy https://orcid.org/0000-0002-1784-2920