Arid
DOI10.1088/1748-9326/9/6/065003
Surface albedo darkening from wildfires in northern sub-Saharan Africa
Gatebe, C. K.1,2; Ichoku, C. M.2; Poudyal, R.1,3; Roman, M. O.2; Wilcox, E.4
通讯作者Gatebe, C. K.
来源期刊ENVIRONMENTAL RESEARCH LETTERS
ISSN1748-9326
出版年2014
卷号9期号:6
英文摘要

Northern sub-Saharan Africa (NSSA) has a wide variety of climate zones or biomes, where albedo dynamics are highly coupled with vegetation dynamics and fire disturbances. Quantifying surface albedo variations due to fire disturbances on time scales of several months to several years is complex and is made worse by lack of accurate and spatially consistent surface albedo data. Here, we estimate the surface albedo effect from wildfires in different land cover types in the NSSA region using Moderate Resolution Imaging Spectroradiometer (MODIS) multi-year observational data (2003-11). The average decrease in albedo after fires at the scale of 1 km MODIS footprint is -0.002 02 +/- 0.000 03 for woody savanna and -0.002 22 +/- 0.000 03 for savanna. These two land cover types together account for > 86% of the total MODIS fire count between 2003 and 2011. We found that only a small fraction of the pixels (<= 10%) burn in two successive years and about 47% had any fire recurrence in 9 years. The study also derived the trajectories of post-fire albedo dynamics from the percentages of pixels that recover to pre-fire albedo values each year. We found that the persistence of surface albedo darkening in most land cover types in the NSSA region is limited to about 6-7 years, after which at least 99% of the burnt pixels recover to their pre-fire albedo. Our results provide critical information for deriving necessary input to various models used in determining the effects of albedo change due to wild fires in the NSSA region.


英文关键词surface albedo wildfires sub-Saharan Africa MODIS biomass burning albedo recovery albedo darkening
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000341825200035
WOS关键词BIDIRECTIONAL REFLECTANCE ; SPECTRAL MEASUREMENTS ; FIRE ; MODIS ; BIOMASS ; SAHEL ; DESERTIFICATION ; ALGORITHM ; DYNAMICS ; AIRBORNE
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构Desert Research Institute
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181939
作者单位1.Univ Space Res Assoc, Columbia, MD 20146 USA;
2.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;
3.Sci Syst & Applicat Inc, Lanham, MD USA;
4.Desert Res Inst, Reno, NV 89512 USA
推荐引用方式
GB/T 7714
Gatebe, C. K.,Ichoku, C. M.,Poudyal, R.,et al. Surface albedo darkening from wildfires in northern sub-Saharan Africa[J]. Desert Research Institute,2014,9(6).
APA Gatebe, C. K.,Ichoku, C. M.,Poudyal, R.,Roman, M. O.,&Wilcox, E..(2014).Surface albedo darkening from wildfires in northern sub-Saharan Africa.ENVIRONMENTAL RESEARCH LETTERS,9(6).
MLA Gatebe, C. K.,et al."Surface albedo darkening from wildfires in northern sub-Saharan Africa".ENVIRONMENTAL RESEARCH LETTERS 9.6(2014).
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