气候变化领域集成服务门户(CCPortal): Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China

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DOI	10.1029/2020JD033582
	Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China
	Yan H.; Wang S.; Dai J.; Wang J.; Chen J.; Shugart H.H.
发表日期	2021
ISSN	2169897X
卷号	126 期号:6
英文摘要	This study is the first to find the unexpected increases in albedo due to forest greening, which has important implications in research of land-surface energy-balance and the forest-climate feedback. We investigated interannual changes of vegetation and albedo for forests and grassland during the main growing period, May to September, between 2002 and 2019 in China using the MODIS-satellite vegetation index and albedo products. These results indicate significant greening (PMK < 0.01) in all types of forests as well as grasslands in China. However, forests had an increasing trend of shortwave albedo (PMK < 0.01) for evergreen forests, deciduous broadleaf forests, and mixed forests. Grasslands showed a decreasing albedo trend (PMK < 0.01) over the same period. Corroborating statistical analyses revealed a positive correlation (P < 0.01) between Moderate Resolution Imaging Spectroradiometer (MODIS) enhanced vegetation index (EVI) and albedo for forests on interannual scales. However, EVI and albedo for grasslands had a negative correlation. Forest greening increased the albedo during the main growing period. This contrasts previous results indicating that albedo decreases as annual forest-cover increases. Developing and analyzing a simple vegetation-coverage-based albedo model showed that increasing forest coverage (i.e., forest greening) had increased area of more brightly leafy canopy and decreased area of darker gaps in the forest canopy. In conjunction, these produced the increased overall albedo observed by satellite. Contrastingly, grassland greening and more precipitation produced decreased albedo. Hence, the greening of forests and grasslands, representing dense and scarce vegetation respectively, has contrasting albedo responses. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	albedo; forest; greening; MODIS; vegetation index
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185381
作者单位	National Meteorological Center, China Meteorological Administration, Beijing, China; Key Lab of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Remote Sensing Science and Engineering, Faculty of Geographical Science, Beijing Normal University, Beijing, China; Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States
推荐引用方式 GB/T 7714	Yan H.,Wang S.,Dai J.,et al. Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China[J],2021,126(6).
APA	Yan H.,Wang S.,Dai J.,Wang J.,Chen J.,&Shugart H.H..(2021).Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China.Journal of Geophysical Research: Atmospheres,126(6).
MLA	Yan H.,et al."Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China".Journal of Geophysical Research: Atmospheres 126.6(2021).