The Amazon region is expected to become an amplified fire-prone system, but the mechanism of fire occurrence is not fully understood. Here, we employed more than 300,000 Sentinel-2 images acquired during 2016–2019 and compiled a high-resolution inventory of active fires (AFs) over the Amazon. We found that the fire activities in the Amazon in 2019 did not stand out compared with those in 2017 as a whole. However, the number of fires increased in 2019 in the absence of an exceptional drought, suggesting increased human disturbance in the Amazon. The high-resolution AF inventory further demonstrated that over 90% of detected AFs were associated with humans clearing deforested fields on forest fringes for agricultural land expansion. Additionally, our inventory indicated that satellite sensors with coarser spatial resolution could miss considerable small fires, especially at the sensitive agriculture–forest interface, which therefore should be targeted as a priority conservation area.

中文翻译：

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亚马逊的主动火力动力学：高分辨率卫星观测的新视角

亚马逊地区有望成为一个放大的火灾易发系统，但火灾发生的机制尚不完全清楚。在这里，我们使用了 2016-2019 年期间获得的超过 300,000 张 Sentinel-2 图像，并编制了亚马逊上空活动火灾 (AF) 的高分辨率清单。我们发现2019年亚马逊地区的火灾活动与2017年整体相比并没有突出。然而，在没有异常干旱的情况下，2019 年的火灾数量有所增加，这表明亚马逊地区的人为干扰有所增加。高分辨率 AF 清单进一步表明，超过 90% 的检测到的 AF 与人类清除森林边缘的森林砍伐田地以扩大农业用地有关。此外，