Tree shade protection factors by Jacaranda mimosifolia: a summertime comparison of UV dosimetry and whole sky image analysis for residential urban environments.
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| Title: | Tree shade protection factors by Jacaranda mimosifolia: a summertime comparison of UV dosimetry and whole sky image analysis for residential urban environments. |
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| Authors: | Downs, Nathan J.1 (AUTHOR) Nathan.Downs@unisq.edu.au, Dekeyser, Stijn1 (AUTHOR) Stijn.Dekeyser@unisq.edu.au, Dawes, Adrian1 (AUTHOR) Adrian.Dawes@unisq.edu.au, Parisi, Alfio V.1 (AUTHOR) Alfio.Parisi@unisq.edu.au, Butler, Harry J.1 (AUTHOR) Harry.Butler@unisq.edu.au, Raj, Nawin1 (AUTHOR) Nawin.Raj@unisq.edu.au, Deo, Ravinesh C.1 (AUTHOR) Ravinesh.Deo@unisq.edu.au, Turner, Joanna1 (AUTHOR) Joanna.Turner@unisq.edu.au, Igoe, Damien1 (AUTHOR) Damien.Igoe@unisq.edu.au, Jackson, Charlene2 (AUTHOR) Charlene.Jackson@unisq.edu.au, Chinnock, Catherine1 (AUTHOR) Catherine.Chinnock@unisq.edu.au, Beckman-Downs, Melanie J.2 (AUTHOR) Melanie.Beckman@unisq.edu.au |
| Source: | Urban Forestry & Urban Greening. Mar2026, Vol. 117, pN.PAG-N.PAG. 1p. |
| Subject Terms: | *Radiation measurements, *Solar radiation, *Environmental sciences, *Plant canopies, Ornamental trees, Public spaces, Seasonal physiological variations |
| Geographic Terms: | Australia, Queensland |
| Abstract: | This study aims to characterize Jacaranda mimosifolia in Queensland as a shade protection species for residential urban environments during peak summertime ultraviolet exposure periods, assessed near solar noon and taking into account changes in tree aspect measured relative to the main trunk and with variation in seasonal foliage. Ultraviolet polysulphone dosimeters and whole sky image (WSI) analysis was employed to derive site protection factors (PF) measured on the north, south, east and western sides of trees planted alongside urban street locations in southern Queensland, Australia for the summer months of December, January and February. Dosimetry and WSI analysis of the site PF measured in 5-minute intervals one hour before and following noon confirmed there is a seasonal variation in protection from ultraviolet radiation due to the presence of Jacaranda mimosifolia. Site PF varied from 2 to 12 with protection peaking at the end of summer when canopy foliage is greatest. Protection factors were shown to follow a monthly cycle confirming observed patterns in critical daytime PF either side of noon for the same species derived previously in research from southern Australia. [Display omitted] • UV comparisons of street tree protection factor (PF) are defined for J. mimosifolia. • Image processing techniques and UV dosimetry measures of PF are compared. • Dosimeters and digital imaging confirm the same median summertime PF of 5.0. • Outcomes define canopy PF for residents living in an elevated UV climate. [ABSTRACT FROM AUTHOR] |
| Copyright of Urban Forestry & Urban Greening is the property of Elsevier B.V. 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: | GreenFILE |
| FullText | Text: Availability: 0 |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 191167732 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Tree shade protection factors by Jacaranda mimosifolia: a summertime comparison of UV dosimetry and whole sky image analysis for residential urban environments. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Downs%2C+Nathan+J%2E%22">Downs, Nathan J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Nathan.Downs@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Dekeyser%2C+Stijn%22">Dekeyser, Stijn</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Stijn.Dekeyser@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Dawes%2C+Adrian%22">Dawes, Adrian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Adrian.Dawes@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Parisi%2C+Alfio+V%2E%22">Parisi, Alfio V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Alfio.Parisi@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Butler%2C+Harry+J%2E%22">Butler, Harry J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Harry.Butler@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Raj%2C+Nawin%22">Raj, Nawin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Nawin.Raj@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Deo%2C+Ravinesh+C%2E%22">Deo, Ravinesh C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Ravinesh.Deo@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Turner%2C+Joanna%22">Turner, Joanna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Joanna.Turner@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Igoe%2C+Damien%22">Igoe, Damien</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Damien.Igoe@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Jackson%2C+Charlene%22">Jackson, Charlene</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> Charlene.Jackson@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Chinnock%2C+Catherine%22">Chinnock, Catherine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Catherine.Chinnock@unisq.edu.au</i><br /><searchLink fieldCode="AR" term="%22Beckman-Downs%2C+Melanie+J%2E%22">Beckman-Downs, Melanie J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> Melanie.Beckman@unisq.edu.au</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Urban+Forestry+%26+Urban+Greening%22">Urban Forestry & Urban Greening</searchLink>. Mar2026, Vol. 117, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Radiation+measurements%22">Radiation measurements</searchLink><br />*<searchLink fieldCode="DE" term="%22Solar+radiation%22">Solar radiation</searchLink><br />*<searchLink fieldCode="DE" term="%22Environmental+sciences%22">Environmental sciences</searchLink><br />*<searchLink fieldCode="DE" term="%22Plant+canopies%22">Plant canopies</searchLink><br /><searchLink fieldCode="DE" term="%22Ornamental+trees%22">Ornamental trees</searchLink><br /><searchLink fieldCode="DE" term="%22Public+spaces%22">Public spaces</searchLink><br /><searchLink fieldCode="DE" term="%22Seasonal+physiological+variations%22">Seasonal physiological variations</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Australia%22">Australia</searchLink><br /><searchLink fieldCode="DE" term="%22Queensland%22">Queensland</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This study aims to characterize Jacaranda mimosifolia in Queensland as a shade protection species for residential urban environments during peak summertime ultraviolet exposure periods, assessed near solar noon and taking into account changes in tree aspect measured relative to the main trunk and with variation in seasonal foliage. Ultraviolet polysulphone dosimeters and whole sky image (WSI) analysis was employed to derive site protection factors (PF) measured on the north, south, east and western sides of trees planted alongside urban street locations in southern Queensland, Australia for the summer months of December, January and February. Dosimetry and WSI analysis of the site PF measured in 5-minute intervals one hour before and following noon confirmed there is a seasonal variation in protection from ultraviolet radiation due to the presence of Jacaranda mimosifolia. Site PF varied from 2 to 12 with protection peaking at the end of summer when canopy foliage is greatest. Protection factors were shown to follow a monthly cycle confirming observed patterns in critical daytime PF either side of noon for the same species derived previously in research from southern Australia. [Display omitted] • UV comparisons of street tree protection factor (PF) are defined for J. mimosifolia. • Image processing techniques and UV dosimetry measures of PF are compared. • Dosimeters and digital imaging confirm the same median summertime PF of 5.0. • Outcomes define canopy PF for residents living in an elevated UV climate. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Urban Forestry & Urban Greening is the property of Elsevier B.V. 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: 10.1016/j.ufug.2025.129260 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Radiation measurements Type: general – SubjectFull: Solar radiation Type: general – SubjectFull: Environmental sciences Type: general – SubjectFull: Plant canopies Type: general – SubjectFull: Ornamental trees Type: general – SubjectFull: Public spaces Type: general – SubjectFull: Seasonal physiological variations Type: general – SubjectFull: Australia Type: general – SubjectFull: Queensland Type: general Titles: – TitleFull: Tree shade protection factors by Jacaranda mimosifolia: a summertime comparison of UV dosimetry and whole sky image analysis for residential urban environments. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Downs, Nathan J. – PersonEntity: Name: NameFull: Dekeyser, Stijn – PersonEntity: Name: NameFull: Dawes, Adrian – PersonEntity: Name: NameFull: Parisi, Alfio V. – PersonEntity: Name: NameFull: Butler, Harry J. – PersonEntity: Name: NameFull: Raj, Nawin – PersonEntity: Name: NameFull: Deo, Ravinesh C. – PersonEntity: Name: NameFull: Turner, Joanna – PersonEntity: Name: NameFull: Igoe, Damien – PersonEntity: Name: NameFull: Jackson, Charlene – PersonEntity: Name: NameFull: Chinnock, Catherine – PersonEntity: Name: NameFull: Beckman-Downs, Melanie J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 16188667 Numbering: – Type: volume Value: 117 Titles: – TitleFull: Urban Forestry & Urban Greening Type: main |
| ResultId | 1 |
