Spatial patterns and fire response of recent Amazonian droughts
Spatial patterns and fire response of recent Amazonian droughts
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DOI：
10.1029/2006gl028946
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发表时间：
2007-04-03
影响因子：
5.2
通讯作者：
Shimabukuro, Yosio Edemir
中科院分区：
文献类型：
--
作者：
Aragao, Luiz Eduardo O. C.;Malhi, Yadvinder;Shimabukuro, Yosio Edemir
人们日益认识到，气候变化有可能导致亚马孙地区干旱频率增加，从而对生态系统和人口产生影响。1997/1998年和2005年的亚马逊干旱使这场辩论成为焦点。我们分析了这些干旱的空间范围和火灾响应2005年干旱TRMM和NOAA-12数据，分别。两次干旱都有明显的特征。2005年干旱的特点是，亚马孙西南部整个旱季干旱加剧。在2005年期间，亚马逊河流域的热像素的年度累计数量比1999 - 2005年的平均值增加了33%。在巴西的阿克里州，2005年干旱的中心，泄漏的森林火灾面积是直接砍伐森林面积的五倍多。在干旱频率增加的情况下，火灾泄漏到易燃森林可能是生物群落转变的主要因素。
There has been an increasing awareness of the possibility of climate change causing increased drought frequency in Amazonia, with ensuing impacts on ecosystems and human populations. This debate has been brought into focus by the 1997/1998 and 2005 Amazonian droughts. We analysed the spatial extent of these droughts and fire response to the 2005 drought with TRMM and NOAA-12 data, respectively. Both droughts had distinct fingerprints. The 2005 drought was characterized by its intensification throughout the dry season in south-western Amazonia. During 2005 the annual cumulative number of hot pixels in Amazonia increased 33% in relation to the 1999 - 2005 mean. In the Brazilian state of Acre, at the epicentre of the 2005 drought, the area of leakage forest fires was more than five times greater than the area directly deforested. Fire leakage into flammable forests may be the major agent of biome transformation in the event of increasing drought frequency.