焦点-南美洲

R. Nelson
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引用次数: 1

摘要

潜在蒸散发是系统的,主要在安第斯山脉和森林砍伐地区,分别由于大尺度过程(如全球变暖)和地表能量分配的变化。在秘鲁南部和巴西,由于从最深根区获得土壤水分的途径减少,在森林高度砍伐的地区观察到实际蒸散量减少。还评估了对水和能量平衡的影响,观察了Budyko理论框架组成部分的变化。其中,干燥指数,即潜在蒸散发与降水的比值,间接反映了干旱条件,以及蒸散发从能量限制到水分限制的转变。结果表明,在玻利维亚亚马逊南部森林砍伐率高的地方,成为一个类似热带稀树草原的地区的趋势是显著的。此外,Arias et al.(2020)表明,自20世纪70年代以来,热带北大西洋的持续变暖加剧,导致该地区地面风和大气水分输送的变化。这些变化导致de-The
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FOCUS -- SOUTH AMERICA
potential evapotranspiration are systematic, mainly in the Andes and over deforested regions, due to large-scale processes (e.g., global warming) and changes in the surface energy partitioning, respectively. In southern Peru and Brazil, a decrease in actual evapotranspiration is observed in highly deforested areas due to a reduced access to soil moisture from the deepest root zone. Implications on the water and energy balance were also evaluated, looking at changes in the components of Budyko's theoretical framework. Among these components, the dryness index, i.e., the ratio between potential evapotranspiration and precipitation, indirectly indicates aridity conditions, and a transition from energy to water limited in evapotranspiration. Results suggest that in places with a high ratio of deforestation located in the southern Amazon in Bolivia, the tendency to become a region with savannah-like conditions is significant. In addition, Arias et al. (2020) show that the ongoing warming in tropical North Atlantic, which has intensified since the 1970s, generates changes in surface winds and atmospheric moisture transport in the region. These changes lead to de-The
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