气候变化领域集成服务门户(CCPortal): Observed changes in fire patterns and possible drivers over Central Africa

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DOI	10.1088/1748-9326/ab9db2
	Observed changes in fire patterns and possible drivers over Central Africa
	Jiang Y.; Zhou L.; Raghavendra A.
发表日期	2020
ISSN	17489318
卷号	15 期号:9
英文摘要	Fire is an integral part of Earth's system that links regional and global biogeochemical cycles, human activities, and ecosystems. Global estimates for biomass burning indicate that Africa is responsible for ∼70% of global burned area and ∼50% of fire-related carbon emissions. Previous studies have documented an overall decline in burned area in the African continent, but changes in fire patterns, such as the frequency and size of different fire categories, have not been assessed. In this study, long-Term fire trends were investigated using the latest burned area data from the MODerate resolution Imaging Spectroradiometer (MODIS) and the Global Fire Emission Database (GFED4s) over Central Africa (10°E-40°E, 15°N-15°S). A 3D (latitude, longitude, time) connected-component labeling algorithm was applied to identify individual fires and their sizes. The results show a decline in burned area by 2.7-3.2 Mha yr-1 (∼1.3% yr-1) for the period 2003-2017, particularly in northern Central Africa. This decline was attributed to significant decreases in both fire frequency and size, particularly for large fires (>100 ha) which contribute to ∼90% of the total burned area. Burned area declined in tropical savannas and grasslands but increased at the edges of the Congolese rainforest. A random forest regression model was applied to quantify the influences of climatic conditions, fuel availability, and agricultural activity on burned area changes. Overall, suppressed fuel, increased dry season length, and decreased rainfall contributed to significant declines in burned area in savannas and grasslands. At the edges of the southern Congolese rainforest, suppressed rainfall and warmer temperature were responsible for the increased burned area. © 2020 The Author(s). Published by IOP Publishing Ltd.
语种	英语
scopus关键词	Agricultural robots; Biogeochemistry; Decision trees; Ecosystems; Radiometers; Rain; Regression analysis; Agricultural activities; Biogeochemical cycle; Climatic conditions; Connected component labeling algorithm; Fire frequencies; Human activities; Moderate resolution imaging spectroradiometer; Regression model; Fires; biogeochemical cycle; biomass burning; burning; dry season; grassland; human activity; MODIS; savanna; Central Africa
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153734
作者单位	Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY 12222, United States
推荐引用方式 GB/T 7714	Jiang Y.,Zhou L.,Raghavendra A.. Observed changes in fire patterns and possible drivers over Central Africa[J],2020,15(9).
APA	Jiang Y.,Zhou L.,&Raghavendra A..(2020).Observed changes in fire patterns and possible drivers over Central Africa.Environmental Research Letters,15(9).
MLA	Jiang Y.,et al."Observed changes in fire patterns and possible drivers over Central Africa".Environmental Research Letters 15.9(2020).