Forest Greening Increases Land Surface Albedo During the Main Growing Period Between 2002 and 2019 in China | |
Yan, Hao2; Wang, Shaoqiang1,3; Dai, Junhu3,4; Wang, Junbang1; Chen, Jin5; 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. |
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