CARVE: Alaskan Fire Emissions Database (AKFED), 2001-2013

This data set provides estimates of annual carbon emissions (kg carbon per square meter) from boreal fires at 450-m resolution for the state of Alaska between 2001 and 2013. To produce these data, daily burned area for 2001 to 2013 was mapped using imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) combined with perimeters from the Alaska Large Fire Database. Carbon consumption was calibrated using available field measurements from black spruce forests in Alaska. Above- and below-ground carbon consumption were modeled based on environmental variables including elevation, day of burning within the fire season, pre-fire tree cover and the differenced normalized burn ratio (dNBR). Modeled uncertainties in carbon consumption are included in the data set. The derived burn area and carbon emissions product, referred to as the Alaskan Fire Emissions Database (AKFED), provides a resource for study of the environmental controls on daily fire dynamics, boreal fire emissions in biogeochemical models, and potential feedbacks from changing fire regimes. There are 26 data files in GeoTIFF (.tif) format with this data set. There are 13 *.tifs for carbon consumption, one for each year, and 13 *.tifs for carbon consumption uncertainty, one for each year.

本数据集提供了2001至2013年间阿拉斯加州范围内、分辨率为450米的北方森林火灾年度碳排放估算数据（单位：千克碳/平方米）。为生成该数据集，研究人员结合中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer，MODIS）的影像与阿拉斯加大型火灾数据库（Alaska Large Fire Database）的火灾边界，绘制了2001至2013年的每日过火面积。碳消耗量的校准采用了阿拉斯加黑云杉林的现有野外实测数据。地上与地下碳消耗量基于一系列环境变量建模，包括海拔、火灾季内的燃烧日期、火前树木覆盖度以及差值归一化燃烧比（differenced normalized burn ratio，dNBR）。数据集同时包含碳消耗量的建模不确定性。本衍生的过火面积与碳排放产品被命名为阿拉斯加火灾排放数据库（Alaskan Fire Emissions Database，AKFED），可为三类研究提供支撑：每日火灾动态的环境调控机制、生物地球化学模型中的北方森林火灾碳排放研究，以及火灾制度变化带来的潜在反馈。本数据集包含26个GeoTIFF（.tif）格式的数据文件：其中13个为碳消耗量文件（每年对应1份），另有13个为碳消耗量不确定性文件（同样每年对应1份）。