Arid
DOI10.3390/rs6043101
Thirty-two Years of Sahelian Zone Growing Season Non-Stationary NDVI3g Patterns and Trends
Anyamba, Assaf; Small, Jennifer L.; Tucker, Compton J.; Pak, Edwin W.
通讯作者Anyamba, Assaf
来源期刊REMOTE SENSING
ISSN2072-4292
出版年2014
卷号6期号:4页码:3101-3122
英文摘要

We update the Global Inventory Modeling and Mapping Studies (GIMMS) analysis of Sahelian vegetation dynamics and trends using the normalized difference vegetation index (NDVI; version 3g) 1981 to 2012 data set. We compare the annual NDIV3g and July to October growing season averages with the three rainfall data sets: the Africa Rainfall Climatology from 1983 to 2012, the Variability Analyses of Surface Climate Observations Version-1.1 from 1951 to 2000, and the Nicholson ground-station precipitation rainfall data from 1981 to 1994. We use the Nicholson ground-station annual precipitation data to determine the reliability of the two continental precipitation data sets for specific locations and specific times, extrapolate these confirmed relationships over the Sahelian Zone from 1983 to 2012 with the Africa Rainfall Climatology, and then place these zonal findings within the 1951 to 2000 record of the Variability Analyses of Surface Climate Observations Version-1.1 precipitation data set. We confirm the extreme nature of the 1984-1985 Sahelian drought, a signature event that marked the minima during the 1980s desiccation period followed within ten years by near-maxima rainfall event in 1994 and positive departures is NDVI, marking beginning of predominantly wetter conditions that have persisted to 2012. We also show the NDVI3g data capture effective rainfall, the rainfall that is utilized by plants to grow, as compared to rainfall that evaporates or is runoff. Using our effective rainfall concept, we estimate average effective rainfall for the entire Sahelian Zone for the 1984 extreme drought was 223 mm/yr as compared to 406 mm/yr in during the 1994 wet period. We conclude that NDVI3g data can used as a proxy for analyzing and interpreting decadal-scale land surface variability and trends over semi arid-lands.


英文关键词Sahel NDVI rainfall climate record growing season standardized anomalies extremes trend patterns
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000336746900025
WOS关键词DIFFERENCE VEGETATION INDEX ; AFRICAN SAHEL ; SPECTRAL REFLECTANCE ; SAHARA DESERT ; SOIL-EROSION ; WEST-AFRICA ; NOAA-AVHRR ; EL-NINO ; RAINFALL ; CLIMATE
WOS类目Remote Sensing
WOS研究方向Remote Sensing
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/184662
作者单位NASA, Goddard Space Flight Ctr, Biospher Sci Lab, GIMMS Grp, Greenbelt, MD 20771 USA
推荐引用方式
GB/T 7714
Anyamba, Assaf,Small, Jennifer L.,Tucker, Compton J.,et al. Thirty-two Years of Sahelian Zone Growing Season Non-Stationary NDVI3g Patterns and Trends[J],2014,6(4):3101-3122.
APA Anyamba, Assaf,Small, Jennifer L.,Tucker, Compton J.,&Pak, Edwin W..(2014).Thirty-two Years of Sahelian Zone Growing Season Non-Stationary NDVI3g Patterns and Trends.REMOTE SENSING,6(4),3101-3122.
MLA Anyamba, Assaf,et al."Thirty-two Years of Sahelian Zone Growing Season Non-Stationary NDVI3g Patterns and Trends".REMOTE SENSING 6.4(2014):3101-3122.
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