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首页> 外文期刊>The Science of the Total Environment >Estimating burn severity and carbon emissions from a historic megafire in boreal forests of China
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Estimating burn severity and carbon emissions from a historic megafire in boreal forests of China

机译：估算中国北部森林历史众多历史悠久的巨大碳排放量

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摘要

Wildfires, especially those of large size, worsen air quality and alter the carbon cycle through combustion of large quantities of biomass and release of carbon into the atmosphere. The Black Dragon fire, which occurred in 1987 in the boreal forests of China is among the top five of such megafires ever recorded in the world. With over 30 years of accumulation of data and availability of new greenhouse gas emission accounting methods, carbon emissions from this megafire can now be estimated with improved precision and greater spatial resolution. To do this, we combined field and remote sensing data to map four burn severity classes and calculated combustion efficiency in terms of the biomass immediately consumed in the fire. Results of the study showed that 1.30 million hectares burned and 52% of that area burned with high severity. The emitted carbon dioxide equivalents (CO_2e), accounted for approximately 10% of total fossil fuel emissions from China in 1987, along with CO (2%-3% of annual anthropogenic CO emissions from China) and non-methane hydrocarbons (NMHC) contributing to the atmospheric pollutants. Our study provides an important basis for carbon emission estimation and understanding the impacts of megafires.
机译：野火，尤其是大尺寸的野火，气体质量恶化，并通过大量生物质的燃烧改变碳循环，并将碳释放到大气中。 1987年在中国的北方森林中发生的黑龙火是曾经在世界上录制的前五大之一。随着30年多的数据积累和新的温室气体排放会计方法的可用性，现在可以通过改善的精度和更大的空间分辨率来估算来自这一兆欧的碳排放。为此，我们组合领域和遥感数据以映射四个烧伤严重性等级，并在火灾中立即消耗的生物质方面计算燃烧效率。该研究的结果表明，烧伤了130万公顷，其中52％的地区燃烧着高度严重程度。发出的二氧化碳当量（CO_2E），占1987年中国化石总燃料排放量的约10％，以及CO（来自中国的年度人为CO排放量的2％-3％）和非甲烷碳氢化合物（NMHC）贡献到大气污染物。我们的研究为碳排放估计提供了重要依据，并了解兆瓦的影响。

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