Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China

doi:10.1029/2020JD033582

	Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China
	Yan, Hao 2; Wang, Shaoqiang 1,3; Dai, Junhu 3,4; Wang, Junbang 1; Chen, Jin 5; Shugart, Herman H.6
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	2021-03-27
卷号	126 期号:6 页码:17
关键词	albedo forest greening MODIS vegetation index
ISSN号	2169-897X
DOI	10.1029/2020JD033582
通讯作者	Yan, Hao(yanhaon@hotmail.com)
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 (P-MK < 0.01) in all types of forests as well as grasslands in China. However, forests had an increasing trend of shortwave albedo (P-MK < 0.01) for evergreen forests, deciduous broadleaf forests, and mixed forests. Grasslands showed a decreasing albedo trend (P-MK < 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.
资助项目	National Key Research and Development Program of China[2017YFC0503803] ; National Natural Science Foundation of China[41571327]
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000634788300006
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/162022]
专题	中国科学院地理科学与资源研究所
通讯作者	Yan, Hao
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing, Peoples R China 2.China Meteorol Adm, Natl Meteorol Ctr, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing, Peoples R China 5.Beijing Normal Univ, Coll Remote Sensing Sci & Engn, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China 6.Univ Virginia, Dept Environm Sci, Charlottesville, VA 22903 USA
推荐引用方式 GB/T 7714	Yan, Hao,Wang, Shaoqiang,Dai, Junhu,et al. Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2021,126(6):17.
APA	Yan, Hao,Wang, Shaoqiang,Dai, Junhu,Wang, Junbang,Chen, Jin,&Shugart, Herman 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),17.
MLA	Yan, Hao,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):17.