The impact of deforestation on the hydrological cycle in Amazonia as observed from remote sensing
The impact of deforestation on the hydrological cycle in Amazonia as observed from remote sensing
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DOI：
10.1080/01431161.2016.1232874
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发表时间：
2016-10
影响因子：
3.4
通讯作者：
N. Vergopolan;J. Fisher
中科院分区：
文献类型：
--
作者：
N. Vergopolan;J. Fisher
摘要鉴于亚马孙地区普遍存在的森林砍伐现象，许多研究都集中在森林砍伐如何影响区域水文循环--从蒸发蒸腾中回收的降水(P)。然而，气候宏观和中尺度模式对ET和P随森林砍伐的变化给出了相互矛盾的结果。到目前为止，这些结果还没有通过观测来评估，所以在这项工作中，我们使用遥感技术评估了砍伐森林和林区十年来ET和P的模式(MODIS和TRMM，2000-2012年)。我们发现，在森林砍伐地区，ET和P相对增加，但在南部/森林砍伐地区，ET和P呈正相关，而在北部/森林覆盖的亚马逊地区，ET和P呈负相关。尽管森林砍伐地区的ET和P绝对值低于边境地区，但我们观察到近10年来森林砍伐地区的ET和P有一个正的变化。林区内ET增加幅度较大，而P从林区内到林缘增加较多，这与ET与P的相关规律相一致。我们的结果有助于了解宏观尺度和中尺度模式之间的争论，因为森林砍伐影响了小尺度环流模式、湍流、水汽通量和辐合，并扩大了我们对相关过程的理解。
ABSTRACT Given widespread Amazonian deforestation, numerous studies have focused on how the regional hydrological cycle – in terms of precipitation (P) recycling from evapotranspiration (ET) – is impacted by deforestation. Nevertheless, climate macroscale and mesoscale models have given contradictory results on changes in ET and P with deforestation. To date, these results have not been evaluated with observations, so in this work, we assessed a decade of patterns in ET and P over deforested and forest areas using remote sensing (MODIS and TRMM, 2000–2012). We found a relative increase in ET and P in deforested areas, though there was a positive ET and P correlation over southern/deforested, and negative in northern/forested Amazonia. Although the absolute ET and P values are lower in deforested areas in comparison to border areas, we observed a positive change in ET and P in the last 10 years at the deforested areas. The increase in ET was larger within the deforested areas; meanwhile, P increased more from inside forest areas to the borders, which agrees with the ET and P correlation patterns. Our results help to inform the debate between the macroscale and mesoscale models, as deforestation impacts small-scale circulation patterns, turbulence, and moisture fluxes and convergence, and expand our understanding of the processes involved.