On the Relationships between Clear-Sky Indices in Photosynthetically Active Radiation and Broadband Ranges in Overcast and Broken-Cloud Conditions.
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| Title: | On the Relationships between Clear-Sky Indices in Photosynthetically Active Radiation and Broadband Ranges in Overcast and Broken-Cloud Conditions. |
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| Authors: | Wandji Nyamsi, William1,2 (AUTHOR) william.wandji@fmi.fi, Saint-Drenan, Yves-Marie3 (AUTHOR) yves-marie.saint-drenan@minesparis.psl.eu, Augustine, John A.4 (AUTHOR) john.a.augustine@noaa.gov, Arola, Antti5 (AUTHOR) antti.arola@fmi.fi, Wald, Lucien3 (AUTHOR) lucien.wald@minesparis.psl.eu |
| Source: | Remote Sensing. Oct2024, Vol. 16 Issue 19, p3718. 27p. |
| Subjects: | Photosynthetically active radiation (PAR), Solar surface, Cloudiness |
| Abstract: | 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−2 in overcast conditions, up to 18 W m−2 when the FSC is small, and 6 W m−2 when all cloudy conditions are merged. The RMSEs are, respectively, 5, 24, and 15 W m−2. The linear and the clear-sky models can be combined with estimates of the broadband irradiance from satellites to yield estimates of PAR. [ABSTRACT FROM AUTHOR] |
| Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 180271468 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: On the Relationships between Clear-Sky Indices in Photosynthetically Active Radiation and Broadband Ranges in Overcast and Broken-Cloud Conditions. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Wandji+Nyamsi%2C+William%22">Wandji Nyamsi, William</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> william.wandji@fmi.fi</i><br /><searchLink fieldCode="AR" term="%22Saint-Drenan%2C+Yves-Marie%22">Saint-Drenan, Yves-Marie</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> yves-marie.saint-drenan@minesparis.psl.eu</i><br /><searchLink fieldCode="AR" term="%22Augustine%2C+John+A%2E%22">Augustine, John A.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> john.a.augustine@noaa.gov</i><br /><searchLink fieldCode="AR" term="%22Arola%2C+Antti%22">Arola, Antti</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> antti.arola@fmi.fi</i><br /><searchLink fieldCode="AR" term="%22Wald%2C+Lucien%22">Wald, Lucien</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> lucien.wald@minesparis.psl.eu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Remote+Sensing%22">Remote Sensing</searchLink>. Oct2024, Vol. 16 Issue 19, p3718. 27p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Photosynthetically+active+radiation+%28PAR%29%22">Photosynthetically active radiation (PAR)</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+surface%22">Solar surface</searchLink><br /><searchLink fieldCode="DE" term="%22Cloudiness%22">Cloudiness</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: 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−2 in overcast conditions, up to 18 W m−2 when the FSC is small, and 6 W m−2 when all cloudy conditions are merged. The RMSEs are, respectively, 5, 24, and 15 W m−2. The linear and the clear-sky models can be combined with estimates of the broadband irradiance from satellites to yield estimates of PAR. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/rs16193718 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 27 StartPage: 3718 Subjects: – SubjectFull: Photosynthetically active radiation (PAR) Type: general – SubjectFull: Solar surface Type: general – SubjectFull: Cloudiness Type: general Titles: – TitleFull: On the Relationships between Clear-Sky Indices in Photosynthetically Active Radiation and Broadband Ranges in Overcast and Broken-Cloud Conditions. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Wandji Nyamsi, William – PersonEntity: Name: NameFull: Saint-Drenan, Yves-Marie – PersonEntity: Name: NameFull: Augustine, John A. – PersonEntity: Name: NameFull: Arola, Antti – PersonEntity: Name: NameFull: Wald, Lucien IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 20724292 Numbering: – Type: volume Value: 16 – Type: issue Value: 19 Titles: – TitleFull: Remote Sensing Type: main |
| ResultId | 1 |
