Impacts of boreal forest fires on the environment in a changing climate

气候变化中北方森林火灾对环境的影响 气候变化预计将导致加拿大北方大部分地区气温升高。 这可能会增加森林火灾，并通过燃烧向大气释放更多的碳和其他温室气体，从而加剧全球变暖效应。 火灾的发生也决定了北方森林的植被，并决定了森林将固碳的数量。 火灾改变了森林的表面特征，因为新的再生植被反射了更多的太阳能，改变了热量和蒸散的能量分配。 这种地表能量耗散的改变影响了当地、区域和全球气候。 该研究计划将综合火灾对碳和能量平衡的影响，以确定北方森林火灾对地球气候的净影响。 该研究将利用全球气候模型预测天气对燃烧区域和火灾严重程度的影响，估计未来燃烧排放的温室气体和污染物的规模。 将把最近通量研究得出的火灾后对碳平衡的影响与燃烧损失结合起来，以提供对温室气体影响的总体估计。 对火灾后地表能量平衡变化的分析将利用在森林地区直接测量的数据和遥感数据。 碳和能量效应将结合起来，为未来100年的火灾提供一个共同的净强迫函数。 该研究将评估对比概念，即更多的火灾通过增加温室气体排放导致积极的气候变暖反馈，但通过增加地球对太阳辐射的反射率导致冷却。 将建立一个中心，在火灾、微气象学、碳动力学和气候变化等领域培训学生。 这种火生态系统方法将提供火对气候影响的第一个净估计，影响在应对全球气候变化时考虑火的方式的政策决定。

Impacts of Boreal Forest Fires on the Environment in a Changing Climate     Climate change is expected to cause warmer temperatures through much of northern Canada.  This will likely increase forest fire and release more carbon and other greenhouse gases to the atmosphere from combustion, increasing the global warming effect.  The occurrence of fire also determines the vegetation of the boreal forest and dictates the amount of carbon that the forest will sequester.  Fire changes the surface characteristics of the forest, because new regenerating vegetation reflects more solar energy and alters the energy partitioning of heat and evapotranspiration.  This alteration of surface energy dissipation affects local, regional and global climate.  The research program will integrate the impact of fire on the carbon and energy balances to establish the net effect of boreal forest fire on the Earth's climate.  The research will estimate the magnitude of future combustion emissions of greenhouse gases and pollutants using global climate model projections of weather impacts on the area burned and the fire severity.  The post-fire effects on the carbon balance from recent flux studies will be integrated with the combustion losses to provide a total estimate of the greenhouse gas implications.  Analyses of the surface energy balance changes following fire will employ data from direct measurements at forested sites and from remote sensing.  The carbon and energy effects will be combined to provide a common net forcing function for fires, which will be projected over the next 100 years.  The research will evaluate the contrasting concepts that more fire causes a positive climate-warming feedback by increasing greenhouse gas emissions but causes cooling by increasing the Earth's reflectivity to solar radiation.  A centre for training students in the fields of fire, micrometeorology, carbon dynamics and climate change will be established.  This fire ecosystem approach will provide the first net estimate of the fire effect on climate, affecting policy decisions on the way that fire is considered in coping with global climate change.