干旱区生态环境知识资源中心(Arid): The Greening and Wetting of the Sahel Have Leveled off since about 1999 in Relation to SST

Arid

DOI	10.3390/rs12172723
	The Greening and Wetting of the Sahel Have Leveled off since about 1999 in Relation to SST
	Chen, Tiexi; Zhou, Shengjie; Liang, Chuanzhuang; Hagan, Daniel Fiifi Tawia; Zeng, Ning; Wang, Jun; Shi, Tingting; Chen, Xin; Dolman, A. J.
通讯作者	Chen, TX
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2020
卷号	12 期号:17
英文摘要	The Sahel, a semi-arid climatic zone with highly seasonal and erratic rainfall, experienced severe droughts in the 1970s and 1980s. Based on remote sensing vegetation indices since early 1980, a clear greening trend is found, which can be attributed to the recovery of contemporaneous precipitation. Here, we present an analysis using long-term leaf area index (LAI), precipitation, and sea surface temperature (SST) records to investigate their trends and relationships. LAI and precipitation show a significant positive trend between 1982 and 2016, at 1.72 x 10(-3)yr(-1)(p< 0.01) and 4.63 mm yr(-1)(p< 0.01), respectively. However, a piecewise linear regression approach indicates that the trends in both LAI and precipitation are not continuous throughout the 35 year period. In fact, both the greening and wetting of the Sahel have been leveled off (pause of rapid growth) since about 1999. The trends of LAI and precipitation between 1982 and 1999 and 1999-2016 are 4.25 x 10(- 3)yr(-1)to - 0.27 x 10(-3)yr(-1), and 9.72 mm yr(-1)to 2.17 mm yr(-1), respectively. These declines in trends are further investigated using an SST index, which is composed of the SSTs of the Mediterranean Sea, the subtropical North Atlantic, and the global tropical oceans. Causality analysis based on information flow theory affirms this precipitation stabilization between 2003 and 2014. Our results highlight that both the greening and the wetting of the Sahel have been leveled off, a feature that was previously hidden in the apparent long-lasting greening and wetting records since the extreme low values in the 1980s.
英文关键词	Sahel precipitation vegetation sea surface temperature greening wetting
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000569632700001
WOS关键词	VEGETATION DYNAMICS ; AFRICAN SAHEL ; WORLD MAP ; RAINFALL ; DROUGHT ; TRENDS ; PRECIPITATION ; INDEX ; TEMPERATURE ; ANOMALIES
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
来源机构	中国科学院大气物理研究所 ; 南京大学 ; 南京信息工程大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326315
作者单位	[Chen, Tiexi; Zhou, Shengjie; Liang, Chuanzhuang; Hagan, Daniel Fiifi Tawia; Chen, Xin; Dolman, A. J.] Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Sch Geog Sci, Nanjing 210044, Peoples R China; [Zeng, Ning] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China; [Zeng, Ning] Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA; [Zeng, Ning] Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA; [Wang, Jun] Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210023, Peoples R China; [Shi, Tingting] Nanjing Univ Informat Sci & Technol, Sch Appl Meteorol, Nanjing 210044, Peoples R China; [Dolman, A. J.] Free Univ Amsterdam, Dept Earth Sci, NL-1081 HV Amsterdam, Netherlands
推荐引用方式 GB/T 7714	Chen, Tiexi,Zhou, Shengjie,Liang, Chuanzhuang,et al. The Greening and Wetting of the Sahel Have Leveled off since about 1999 in Relation to SST[J]. 中国科学院大气物理研究所, 南京大学, 南京信息工程大学,2020,12(17).
APA	Chen, Tiexi.,Zhou, Shengjie.,Liang, Chuanzhuang.,Hagan, Daniel Fiifi Tawia.,Zeng, Ning.,...&Dolman, A. J..(2020).The Greening and Wetting of the Sahel Have Leveled off since about 1999 in Relation to SST.REMOTE SENSING,12(17).
MLA	Chen, Tiexi,et al."The Greening and Wetting of the Sahel Have Leveled off since about 1999 in Relation to SST".REMOTE SENSING 12.17(2020).