Rainforest in protected areas in the Brazilian Amazon is at risk due to increasing economic pressures and recent weakening of environmental agencies and legislation by the federal administration. This study examines the impacts of deforestation in protected areas on dry‐season precipitation in the Brazilian state of Rondônia located in the southwestern Brazilian Amazon. Regional‐climate model simulations indicate that clearing protected forests in Rondônia would result in substantial changes to the surface energy balance, including increased sensible and decreased latent heat flux. Consequent changes to low‐level wind circulation would enhance moisture flux convergence and convection over the newly deforested areas, leading to enhanced rainfall in those areas. However, deforestation of protected areas would decrease dry season rainfall up to 30% in the existing agricultural region, with potentially important negative impacts on agricultural production. Additionally, our results indicates that following deforestation, the newly degraded areas will experience warmer and drier afternoons that could place the remaining natural vegetation under vapor deficit stress.

中文翻译：

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保护区森林砍伐对巴西亚马逊干旱季节区域气候的影响

由于日益增加的经济压力以及最近联邦政府对环境机构和立法的削弱，巴西亚马逊保护区的雨林正处于危险之中。这项研究调查了位于巴西西南亚马逊地区的巴西朗多尼亚州保护区森林砍伐对旱季降水的影响。区域气候模型模拟表明，朗多尼亚州的保护性森林砍伐将导致地表能量平衡发生重大变化，包括显着增加和潜热通量减少。随之而来的低空风循环的变化将增强新砍伐森林地区的水汽通量收敛和对流，从而导致这些地区的降雨增加。然而，保护区的森林砍伐将使现有农业地区的旱季降雨量减少多达30％，对农业生产可能产生重要的负面影响。此外，我们的结果表明，森林砍伐后，新退化的地区将经历更温暖，更干燥的午后，这可能会使其余的自然植被处于水汽亏缺压力之下。