气候变化领域集成服务门户(CCPortal): Quantitative analysis of the links between forest structure and land surface albedo on a global scale

CCPortal

DOI	10.1016/j.rse.2020.111854
	Quantitative analysis of the links between forest structure and land surface albedo on a global scale
	Alibakhshi S.; Naimi B.; Hovi A.; Crowther T.W.; Rautiainen M.
发表日期	2020
ISSN	00344257
卷号	246
英文摘要	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. © 2020 The Authors
英文关键词	Albedo; Forest density; Forest structure; Leaf area index; Tree cover
语种	英语
scopus关键词	Earth (planet); Image resolution; Infrared devices; Pixels; Radiometers; Solar radiation; Generalized additive model; Geographical locations; Land surface albedo; Moderate resolution imaging spectroradiometer; Remotely sensed data; Solar zenith angle; Spatial resolution; Visible spectral regions; Forestry; albedo; forest cover; forest ecosystem; growing season; land surface; leaf area index; MODIS; pixel; quantitative analysis; spatial resolution; tree
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179292
作者单位	Department of Built Environment, School of Engineering, Aalto University, P.O. Box 14100, Aalto, 00076, Finland; Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, Helsinki, 00014, Finland; Institute of Integrative Biology, ETH Zürich, Universitätstrasse 16, P.O. Box 8092, Zürich, Switzerland; Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, P.O. Box 15500, Aalto, 00076, Finland
推荐引用方式 GB/T 7714	Alibakhshi S.,Naimi B.,Hovi A.,et al. Quantitative analysis of the links between forest structure and land surface albedo on a global scale[J],2020,246.
APA	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,246.
MLA	Alibakhshi S.,et al."Quantitative analysis of the links between forest structure and land surface albedo on a global scale".Remote Sensing of Environment 246(2020).