Surface forcing of non-stand-replacing fires in Siberian larch forests
Surface forcing of non-stand-replacing fires in Siberian larch forests
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DOI：
10.1088/1748-9326/aab443
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发表时间：
2018-04-01
影响因子：
6.7
通讯作者：
Loboda, Tatiana V.
中科院分区：
文献类型：
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作者：
Chen, Dong;Loboda, Tatiana V.
野火是西伯利亚落叶松森林的主要干扰因素。大范围的低到中等强度的不可替代火灾是这些森林火灾状况的一个显着特征。最近对这些火灾的大规模研究主要集中在它们对碳预算的影响；然而，尚未考虑火灾后反照率变化对能源预算的潜在影响。本研究使用 MODIS MCD43A3 反照率产品的完整记录和专门为俄罗斯森林开发的烧毁面积产品，对 2001 年至 2012 年间经历过非替代性火灾的西伯利亚落叶松森林的火后地表强迫进行了量化。尽管存在很大的变异性，但通过反照率施加的非替代性火灾的平均影响是持续至少 14 年的负面强迫。然而，强迫的强度远小于替代火灾所施加的强度，这突显了在涉及该地区火灾影响的研究中区分两种火灾类型的重要性。本研究的结果还表明，基于 MODIS 的夏季差分归一化燃烧率 (dNBR) 为区分非替代火灾和替代火灾提供了可靠的指标，总体准确率为 88%，这对该地区火灾后能源预算和碳预算的未来建模工作具有相当重要的意义。
Wildfires are the dominant disturbance agent in the Siberian larch forests. Extensive low-to mediate-intensity non-stand-replacing fires are a notable property of fire regime in these forests. Recent large scale studies of these fires have focused mostly on their impacts on carbon budget; however, their potential impacts on energy budget through post-fire albedo changes have not been considered. This study quantifies the post-fire surface forcing for Siberian larch forests that experienced non-stand-replacing fires between 2001 and 2012 using the full record of MODIS MCD43A3 albedo product and a burned area product developed specifically for the Russian forests. Despite a large variability, the mean effect of non-stand-replacing fires imposed through albedo is a negative forcing which lasts for at least 14 years. However, the magnitude of the forcing is much smaller than that imposed by stand-replacing fires, highlighting the importance of differentiating between the two fire types in the studies involving the fire impacts in the region. The results of this study also show that MODIS-based summer differenced normalized burn ratio (dNBR) provides a reliable metric for differentiating non-stand-replacing from stand-replacing fires with an overall accuracy of 88%, which is of considerable importance for future work on modeling post-fire energy budget and carbon budget in the region.