Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1088/1748-9326/9/6/065003 |
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
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ISSN | 1748-9326 |
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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