全球智库信息集成服务系统(G2TT): Differences in satellite-derived NOx emission factors between Eurasian and North American boreal forest fires.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1016/j.atmosenv.2014.08.071
	Differences in satellite-derived NOx emission factors between Eurasian and North American boreal forest fires.
	Schreier SF; Richter A; Schepaschenko D; Shvidenko A; Hilboll A; Burrows JP
发表日期	2015
出处	Atmospheric Environment 121: 55-65
出版年	2015
语种	英语
摘要	Current fire emission inventories apply universal emission factors (EFs) for the calculation of NOx emissions over large biomes such as boreal forest. However, recent satellite-based studies over tropical and subtropical regions have indicated spatio-temporal variations in EFs within specific biomes. In this study, satellite measurements of tropospheric NO2 vertical columns (TVC NO2) from the GOME-2 instrument and fire radiative power (FRP) from MODIS are used for the estimation of fire emission rates (FERs) of NOx over Eurasian and North American boreal forests. The retrieval of TVC NO2 is based on a stratospheric correction using simulated stratospheric NO2 instead of applying the reference sector method, which was used in a previous study. The model approach is more suitable for boreal latitudes. TVC NO2 and FRP are spatially aggregated to a 1 degree by 1 degree horizontal resolution and temporally averaged to monthly values. The conversion of the satellite-derived tropospheric NO2 columns into production rates of NOx from fire (Pf) is based on the NO2/NOx ratio as obtained from the MACC reanalysis data set and an assumed lifetime of NOx. A global land cover map is used to define boreal forests across these two regions in order to evaluate the FERs of NOx for this biome. The FERs of NOx, which are derived from the gradients of the linear relationship between Pf and FRP, are more than 30% lower for North American than for Eurasian boreal forest fires. We speculate that these discrepancies are mainly related to the variable nitrogen content in plant tissues, which is higher in deciduous forests dominating large parts in Eurasia. In order to compare the obtained values with EFs found in the literature, the FERs are converted into EFs. The satellite-based EFs of NOx are estimated at 0.83 and 0.61 g/kg for Eurasian and North American boreal forests, respectively, which is in good agreement with the value found in a recent emission factor compilation. However, recent fire emission inventories are based on EFs of NOx that are 3-5 times larger, which indicates that there are still large uncertainties in estimates of NOx from biomass burning, especially on the regional scale.
主题	Ecosystems Services and Management (ESM)
关键词	Satellite measurements Tropospheric NO2 Fire radiative power NOx emission factor Boreal forest
URL	http://pure.iiasa.ac.at/id/eprint/11355/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/130296
推荐引用方式 GB/T 7714	Schreier SF,Richter A,Schepaschenko D,et al. Differences in satellite-derived NOx emission factors between Eurasian and North American boreal forest fires.. 2015.