甲烷排放源逆向轨迹反演模式研究

A Backward Trajectory Inversion Model for Methane Emission over Beijing Area

基于逆向轨迹计算和单点浓度连续观测资料建立了一个甲烷排放源的反演模式 .经系统调试表明模式具有正确反映边界层物理过程的能力 .在理想条件下 ,模式相当准确地反演出 1 0 0km水平范围内设定的排放源和分布 .用 9天的实际甲烷浓度连续观测资料对北京地区的排放源情况进行个例计算 ,获得主要源块的排放率在0 0 0 66～ 0 0 2 6mg/ (m2 ·s)范围内 ,与区域内的重要排放源 (稻田 )的排放情况相一致 .

A Backward trajectory inversion model was established for estimating methane emission over Beijing area, with in situ data of methane measurement. The model was systematically tested for its ability on reflecting diffusion processes in atmospheric boundary layers. In specific condition, the model acted excellently on calculating emission strength and distribution over an area of 100km scale. By applying to Beijing area with 9 days real methane data and practice meteorological data, the model showed source patches in this area with emission rate 0 0066～0 026mg/(m 2·s), which was correspond well to rice fields emission, the major methane source, in this region. Model results of source patches also showed certain spatial correlation with rice fields distribution.