Fire emissions estimates in Siberia: evaluation of uncertainties in area burned, land cover, and fuel consumption
Fire emissions estimates in Siberia: evaluation of uncertainties in area burned, land cover, and fuel consumption
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DOI：
10.1139/cjfr-2012-0367
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发表时间：
2013-05-01
影响因子：
2.2
通讯作者：
Conard, Susan G.
中科院分区：
文献类型：
--
作者：
Kukavskaya, Elena A.;Soja, Amber J.;Conard, Susan G.
北方森林构成了世界上最大的陆地碳库。这些森林的主要自然干扰是野火，它直接或间接地改变了碳收支和大气。俄罗斯的野火排放极大地促进了全球碳循环，并可能对气候变化产生重要的反馈作用。已公布的俄罗斯北方森林火灾碳排放估计值因使用的方法和数据集的不同而有很大差异。我们检查了用于估计西伯利亚野火排放的各种火灾和植被产品。在四个基于卫星的火灾数据集中，西伯利亚的年度和每月烧毁面积估计值有很大(最多五倍)的差异。俄罗斯官方数据通常不到卫星估计的10%。在五种土地覆盖产品中，每个生态系统的年烧毁面积估计比例的差异高达40%。因此，燃料消耗量估计将根据所使用的具体植被测绘产品和天气条件而有很大差异(3%-98%)。核实和确认燃烧面积和土地覆盖数据集，以及编制燃料地图和燃烧模型，对于准确估计西伯利亚野火排放至关重要，这对于平衡碳收支和评估对气候变化的反馈至关重要。
Boreal forests constitute the world's largest terrestrial carbon pools. The main natural disturbance in these forests is wildfire, which modifies the carbon budget and atmosphere, directly and indirectly. Wildfire emissions in Russia contribute substantially to the global carbon cycle and have potentially important feedbacks to changing climate. Published estimates of carbon emissions from fires in Russian boreal forests vary greatly depending on the methods and data sets used. We examined various fire and vegetation products used to estimate wildfire emissions for Siberia. Large (up to fivefold) differences in annual and monthly area burned estimates for Siberia were found among four satellite-based fire data sets. Official Russian data were typically less than 10% of satellite estimates. Differences in the estimated proportion of annual burned area within each ecosystem were as much as 40% among five land-cover products. As a result, fuel consumption estimates would be expected to vary widely (3%-98%) depending on the specific vegetation mapping product used and as a function of weather conditions. Verification and validation of burned area and land-cover data sets along with the development of fuel maps and combustion models are essential for accurate Siberian wildfire emission estimates, which are central to balancing the carbon budget and assessing feedbacks to climate change.