{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T21:20:52Z","timestamp":1779916852249,"version":"3.53.1"},"reference-count":72,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2024,10,6]],"date-time":"2024-10-06T00:00:00Z","timestamp":1728172800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Framework Partnership Agreement on Copernicus User Uptake of the European Union through the French Spatial Agency CNES"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Several studies proposed relationships linking irradiances in the photosynthetically active radiation (PAR) range and broadband irradiances. A previous study published in 2024 by the same authors proposes a linear model relating clear-sky indices in the PAR and broadband ranges that has been validated in clear and overcast conditions only. The present work extends this study for broken-cloud conditions by using ground-based measurements obtained from the Surface Radiation Budget Network in the U.S.A. mainland. As expected, the clear-sky indices are highly correlated and are linked by affine functions whose parameters depend on the fractional sky cover (FSC), the year, and the site. The previous linear model is also efficient in broken-cloud conditions, with the same level of accuracy as in overcast conditions. When this model is combined with a PAR clear-sky model, the result tends to overestimate the PAR as the FSC decreases, i.e., when fewer and fewer scattered clouds are present. The bias is equal to 1 W m\u22122 in overcast conditions, up to 18 W m\u22122 when the FSC is small, and 6 W m\u22122 when all cloudy conditions are merged. The RMSEs are, respectively, 5, 24, and 15 W m\u22122. The linear and the clear-sky models can be combined with estimates of the broadband irradiance from satellites to yield estimates of PAR.<\/jats:p>","DOI":"10.3390\/rs16193718","type":"journal-article","created":{"date-parts":[[2024,10,7]],"date-time":"2024-10-07T07:30:18Z","timestamp":1728286218000},"page":"3718","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["On the Relationships between Clear-Sky Indices in Photosynthetically Active Radiation and Broadband Ranges in Overcast and Broken-Cloud Conditions"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0048-292X","authenticated-orcid":false,"given":"William","family":"Wandji Nyamsi","sequence":"first","affiliation":[{"name":"Finnish Meteorological Institute, 00560 Helsinki, Finland"},{"name":"Department of Physics, Faculty of Science, University of Yaound\u00e9 I, Yaound\u00e9 P.O. Box 812, Cameroon"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1471-1092","authenticated-orcid":false,"given":"Yves-Marie","family":"Saint-Drenan","sequence":"additional","affiliation":[{"name":"MINES Paris, PSL University, Centre Observation Impacts Energie (O.I.E.), 06904 Sophia-Antipolis, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6645-7404","authenticated-orcid":false,"given":"John A.","family":"Augustine","sequence":"additional","affiliation":[{"name":"NOAA Global Monitoring Laboratory (GML), Boulder, CO 80305, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9220-0194","authenticated-orcid":false,"given":"Antti","family":"Arola","sequence":"additional","affiliation":[{"name":"Finnish Meteorological Institute, Atmospheric Research Centre of Eastern Finland, 70211 Kuopio, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2916-2391","authenticated-orcid":false,"given":"Lucien","family":"Wald","sequence":"additional","affiliation":[{"name":"MINES Paris, PSL University, Centre Observation Impacts Energie (O.I.E.), 06904 Sophia-Antipolis, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,10,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"443","DOI":"10.1016\/0002-1571(72)90045-3","article-title":"Test of current definitions of photosynthetically active radiation against leaf photosynthesis data","volume":"10","author":"McCree","year":"1972","journal-title":"Agric. 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