Quantifying Fire-Induced Surface Climate Changes in the Savanna and Rainforest Biomes of Brazil
Quantifying Fire-Induced Surface Climate Changes in the Savanna and Rainforest Biomes of Brazil
复制标题
DOI：
10.3390/fire6080311
复制
发表时间：
2023-08
期刊：
影响因子：
--
通讯作者：
F. de Sales;Zackary Werner;João Gilberto de Souza Ribeiro
中科院分区：
文献类型：
--
作者：
F. de Sales;Zackary Werner;João Gilberto de Souza Ribeiro
这项研究采用基于遥感和数值模型的综合研究方法来量化烧毁地区对受火灾影响最严重的两个巴西生物群落（热带稀树草原和亚马逊雨林）地表气候的影响。我们的估计表明，2007 年至 2020 年间，平均约有 6% 的稀树草原和 2% 的雨林被烧毁。基于 14 年气候模型模拟的非参数回归表明，每燃烧 1 km2，稀树草原的潜热通量平均减少约 0.17 W m−2，雨林的潜热通量平均减少约 0.60 W m−2，其中大部分影响是在雨季开始时记录的。感热通量和地热通量也会受到影响，但强度较小。地表空气也变得更加温暖和干燥，尤其是在雨林被烧毁的地区。在我们的实验中，平均而言，火灾使稀树草原和雨林的初级生产力分别减少了 12% 和 10%。
This study uses a combined research approach based on remote-sensing and numerical modeling to quantify the effects of burned areas on the surface climate in the two Brazilian biomes most affected by fires: the tropical savanna and the Amazon rainforest. Our estimates indicate that between 2007 and 2020, approximately 6% of the savanna and 2% of the rainforest were burned on average. Non-parametric regressions based on 14-year climate model simulations indicate that latent heat flux decreases on average by approximately 0.17 W m−2 in the savanna and 0.60 W m−2 in the rainforest per each 1 km2 burned, with most of the impacts registered during the onset of the wet season. Sensible and ground heat fluxes are also impacted but at less intensity. Surface air is also warmer and drier, especially over rainforest burned sites. On average, fire reduced gross primary production in the savanna and rainforest by 12% and 10%, respectively, in our experiments.