Inconsistencies of interannual variability and trends in long-term   satellite leaf area index products

doi:10.1111/gcb.13787

CORC > 北京大学 > 城市与环境学院

	Inconsistencies of interannual variability and trends in long-term satellite leaf area index products
	Jiang, Chongya ; Ryu, Youngryel ; Fang, Hongliang ; Myneni, Ranga ; Claverie, Martin ; Zhu, Zaichun
刊名	GLOBAL CHANGE BIOLOGY
	2017
关键词	GLASS GLOBMAP intercomparison LAI3g leaf area index (LAI) TCDR time series NDVI TIME-SERIES PHOTOSYNTHETICALLY ACTIVE RADIATION EMPIRICAL MODE DECOMPOSITION VEGETATION GREENING TREND TRIPLE COLLOCATION LAI PRODUCTS LAND-SURFACE GLOBAL MODIS DATA SETS VALIDATION
DOI	10.1111/gcb.13787
英文摘要	Understanding 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.; National Research Foundation of Korea [NRF-2014R1A2A1A11051134]; National Key Research and Development Program of China [2016YFA0600201]; SCI(E); ARTICLE; 10; 4133-4146; 23
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/470676]
专题	城市与环境学院
推荐引用方式 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.
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.
MLA	Jiang, Chongya,et al."Inconsistencies of interannual variability and trends in long-term satellite leaf area index products".GLOBAL CHANGE BIOLOGY (2017).