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Inconsistencies of interannual variability and trends in long-term satellite leaf area index products
Jiang, Chongya1; Ryu, Youngryel1,2,3,4; Fang, Hongliang5,6; Myneni, Ranga7; Claverie, Martin8,9; Zhu, Zaichun10
2017-10-01
Source PublicationGLOBAL CHANGE BIOLOGY
ISSN1354-1013
Volume23Issue:10Pages:4133-4146
Corresponding AuthorRyu, Youngryel(yryu@snu.ac.kr)
AbstractUnderstanding the long-term performance of global satellite leaf area index (LAI) products is important for global change research. However, few effort has been devoted to evaluating the long-term time-series consistencies of LAI products. This study compared four long-term LAI products (GLASS, GLOBMAP, LAI3g, and TCDR) in terms of trends, interannual variabilities, and uncertainty variations from 1982 through 2011. This study also used four ancillary LAI products (GEOV1, MERIS, MODIS C5, and MODIS C6) from 2003 through 2011 to help clarify the performances of the four long-term LAI products. In general, there were marked discrepancies between the four long-term LAI products. During the pre-MODIS period (1982-1999), both linear trends and interannual variabilities of global mean LAI followed the order GLASS>LAI3g>TCDR>GLOBMAP. The GLASS linear trend and interannual variability were almost 4.5 times those of GLOBMAP. During the overlap period (2003-2011), GLASS and GLOBMAP exhibited a decreasing trend, TCDR no trend, and LAI3g an increasing trend. GEOV1, MERIS, and MODIS C6 also exhibited an increasing trend, but to a much smaller extent than that from LAI3g. During both periods, the R-2 of detrended anomalies between the four long-term LAI products was smaller than 0.4 for most regions. Interannual variabilities of the four long-term LAI products were considerably different over the two periods, and the differences followed the order GLASS>LAI3g>TCDR>GLOBMAP. Uncertainty variations quantified by a collocation error model followed the same order. Our results indicate that the four long-term LAI products were neither intraconsistent over time nor interconsistent with each other. These inconsistencies may be due to NOAA satellite orbit changes and MODIS sensor degradation. Caution should be used in the interpretation of global changes derived from the four long-term LAI products.
KeywordGLASS GLOBMAP intercomparison LAI3g leaf area index (LAI) TCDR time series
DOI10.1111/gcb.13787
WOS KeywordNDVI TIME-SERIES ; PHOTOSYNTHETICALLY ACTIVE RADIATION ; EMPIRICAL MODE DECOMPOSITION ; VEGETATION GREENING TREND ; TRIPLE COLLOCATION ; LAI PRODUCTS ; LAND-SURFACE ; GLOBAL MODIS ; DATA SETS ; VALIDATION
Indexed BySCI
Language英语
Funding ProjectNational Research Foundation of Korea[NRF-2014R1A2A1A11051134] ; National Key Research and Development Program of China[2016YFA0600201]
Funding OrganizationNational Research Foundation of Korea ; National Key Research and Development Program of China
WOS Research AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
WOS SubjectBiodiversity Conservation ; Ecology ; Environmental Sciences
WOS IDWOS:000410642100015
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/61991
Collection中国科学院地理科学与资源研究所
Corresponding AuthorRyu, Youngryel
Affiliation1.Seoul Natl Univ, Brain Korea Plus Team 21, Seoul, South Korea
2.Seoul Natl Univ, Dept Landscape Architecture & Rural Syst Engn, Seoul, South Korea
3.Seoul Natl Univ, Interdisciplinary Program Agr & Forest Meteorol, Seoul, South Korea
4.Seoul Natl Univ, Interdisciplinary Program Landscape Architecture, Seoul, South Korea
5.Chinese Acad Sci, LREIS, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
6.Univ Chinese Acad Sci, Beijing, Peoples R China
7.Boston Univ, Dept Earth & Environm, Boston, MA 02215 USA
8.Univ Maryland, Dept Geog Sci, College Pk, MD 20742 USA
9.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
10.Peking Univ, Coll Urban & Environm Sci, Sino French Inst Earth Syst Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Chongya,Ryu, Youngryel,Fang, Hongliang,et al. Inconsistencies of interannual variability and trends in long-term satellite leaf area index products[J]. GLOBAL CHANGE BIOLOGY,2017,23(10):4133-4146.
APA Jiang, Chongya,Ryu, Youngryel,Fang, Hongliang,Myneni, Ranga,Claverie, Martin,&Zhu, Zaichun.(2017).Inconsistencies of interannual variability and trends in long-term satellite leaf area index products.GLOBAL CHANGE BIOLOGY,23(10),4133-4146.
MLA Jiang, Chongya,et al."Inconsistencies of interannual variability and trends in long-term satellite leaf area index products".GLOBAL CHANGE BIOLOGY 23.10(2017):4133-4146.
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