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Quantitative analysis of the links between forest structure and land surface albedo on a global scale

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Alibakhshi, Sara
dc.contributor.author Naimi, Babak
dc.contributor.author Hovi, Aarne
dc.contributor.author Crowther, Thomas W.
dc.contributor.author Rautiainen, Miina
dc.date.accessioned 2020-06-01T06:50:30Z
dc.date.available 2020-06-01T06:50:30Z
dc.date.issued 2020-09-01
dc.identifier.citation Alibakhshi , S , Naimi , B , Hovi , A , Crowther , T W & Rautiainen , M 2020 , ' Quantitative analysis of the links between forest structure and land surface albedo on a global scale ' , Remote Sensing of Environment , vol. 246 , 111854 . https://doi.org/10.1016/j.rse.2020.111854 en
dc.identifier.issn 0034-4257
dc.identifier.other PURE UUID: 0ad744fb-16a8-40c4-a7ae-30001b8a8cd0
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/0ad744fb-16a8-40c4-a7ae-30001b8a8cd0
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85084675482&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/43187565/Alibakhshi_Quantitative_analysis_of_the_links_RSoE.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/44453
dc.description.abstract Forests are critical in regulating climate by altering the Earth's surface albedo. Therefore, there is an urgent need to enhance our knowledge about the effects of forest structure on albedo. Here, we present a global assessment of the links between forest structure and albedo at a 1-km spatial resolution using generalized additive models (GAMs). We used remotely sensed data to obtain variables representing forest structure, including forest density, leaf area index, and tree cover, during the peak growing season in 2005 with pure forest pixels that cover ~7% of the Earth's surface. Furthermore, we estimated black-sky albedo at a solar zenith angle of 38° using the most recent collection of the moderate resolution imaging spectroradiometer (MODIS; version 6) at shortwave, near-infrared, and visible spectral regions. In addition, for the first time, we mapped the magnitude of the relationship between forest structure and albedo at each pixel with a 0.5-degree spatial resolution. Our results suggested that forest structure may modulate albedo in most of the sub-biomes. The response of shortwave albedo was always positive to the leaf area index and negative to the tree cover (except for deciduous broadleaf forests in mediterranean and temperate regions), while the response to forest density varied across space in 2005. The spatial map affirmed that the links between forest structure and albedo vary over geographical locations. In sum, our study emphasized the importance of forest structure in the surface albedo regulation. This paper provides the first spatially explicit evidence of the magnitude of relationships between forest structure and albedo on a global scale. en
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Remote Sensing of Environment en
dc.relation.ispartofseries Volume 246 en
dc.rights openAccess en
dc.title Quantitative analysis of the links between forest structure and land surface albedo on a global scale en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Built Environment
dc.contributor.department University of Helsinki
dc.contributor.department Swiss Federal Institute of Technology Zurich
dc.contributor.department Department of Electronics and Nanoengineering en
dc.subject.keyword Albedo
dc.subject.keyword Forest density
dc.subject.keyword Forest structure
dc.subject.keyword Leaf area index
dc.subject.keyword Tree cover
dc.identifier.urn URN:NBN:fi:aalto-202006013426
dc.identifier.doi 10.1016/j.rse.2020.111854
dc.type.version publishedVersion

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