Arid
DOI10.1007/s00382-015-2522-4
Impact of burned areas on the northern African seasonal climate from the perspective of regional modeling
De Sales, Fernando1; Xue, Yongkang1,2; Okin, Gregory S.1
通讯作者De Sales, Fernando
来源期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2016
卷号47期号:11页码:3393-3413
英文摘要

This study investigates the impact of burned areas on the surface energy balance and monthly precipitation in northern Africa as simulated by a state-of-the-art regional model. Mean burned area fraction derived from MODIS date of burning product was implemented in a set of 1-year long WRF-NMM/SSiB2 model simulations. Vegetation cover fraction and LAI were degraded daily based on mean burned area fraction and on the survival rate for each vegetation land cover type. Additionally, ground darkening associated with wildfire-induced ash and charcoal deposition was imposed through lower ground albedo for a period after burning. In general, wildfire-induced vegetation and ground condition deterioration increased mean surface albedo by exposing the brighter bare ground, which in turn caused a decrease in monthly surface net radiation. On average, the wildfire-season albedo increase was approximately 6.3 % over the Sahel. The associated decrease in surface available energy caused a drop in surface sensible heat flux to the atmosphere during the dry months of winter and early spring, which gradually transitioned to a more substantial decrease in surface evapotranspiration in April and May that lessened throughout the rainy season. Overall, post-fire land condition deterioration resulted in a decrease in precipitation over sub-Saharan Africa, associated with the weakening of the West African monsoon progression through the region. A decrease in atmospheric moisture flux convergence was observed in the burned area simulations, which played a dominant role in reducing precipitation in the area, especially in the months preceding the monsoon onset. The areas with the largest precipitation impact were those covered by savannas and rainforests, where annual precipitation decreased by 3.8 and 3.3 %, respectively. The resulting precipitation decrease and vegetation deterioration caused a drop in gross primary productivity in the region, which was strongest in late winter and early spring. This study suggests the cooling and drying of atmosphere induced by burned areas caused the strengthening of subsidence during pre-onset and weakening of upward atmospheric motion during onset and mature stages of the monsoon leading to a waning of convective instability and precipitation. Monthly mid-tropospheric vertical wind showed a strengthening of downward motion in winter and spring seasons, and weakening of upward movement during the rainy months. Furthermore, precipitation energy analysis revealed that most of precipitation decrease originated from convective events, which supports the hypothesis of reduced convective instability due to wildfires.


英文关键词Impact of burned areas on regional climate Regional climate modeling Wildfire Sahel precipitation Sahel land cover change
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000389349000002
WOS关键词DOWNSCALING ABILITY ; SURFACE ALBEDO ; FIRE ; SAHEL ; DESERTIFICATION ; DEFORESTATION ; EMISSIONS ; DYNAMICS ; FEEDBACK ; SCALES
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
来源机构University of California, Los Angeles
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192082
作者单位1.Univ Calif Los Angeles, Dept Geog, Los Angeles, CA 90024 USA;
2.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
推荐引用方式
GB/T 7714
De Sales, Fernando,Xue, Yongkang,Okin, Gregory S.. Impact of burned areas on the northern African seasonal climate from the perspective of regional modeling[J]. University of California, Los Angeles,2016,47(11):3393-3413.
APA De Sales, Fernando,Xue, Yongkang,&Okin, Gregory S..(2016).Impact of burned areas on the northern African seasonal climate from the perspective of regional modeling.CLIMATE DYNAMICS,47(11),3393-3413.
MLA De Sales, Fernando,et al."Impact of burned areas on the northern African seasonal climate from the perspective of regional modeling".CLIMATE DYNAMICS 47.11(2016):3393-3413.
条目包含的文件
文件名称/大小 资源类型 版本类型 开放类型 使用许可
Impact of burned are(4106KB)期刊论文出版稿开放获取CC BY-NC-SA浏览
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[De Sales, Fernando]的文章
[Xue, Yongkang]的文章
[Okin, Gregory S.]的文章
百度学术
百度学术中相似的文章
[De Sales, Fernando]的文章
[Xue, Yongkang]的文章
[Okin, Gregory S.]的文章
必应学术
必应学术中相似的文章
[De Sales, Fernando]的文章
[Xue, Yongkang]的文章
[Okin, Gregory S.]的文章
相关权益政策
暂无数据
收藏/分享
文件名: Impact of burned areas on the northern African seasonal climate from the perspective of regional modeling.pdf
格式: Adobe PDF
此文件暂不支持浏览

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。