【摘要】 利用OMI卫星遥感反演的甲醛柱浓度数据,结合MEGAN模式和MEIC排放清单研究了2005—2016年中国对流层甲醛柱浓度的时空特征和长期变化趋势,以及甲醛柱浓度的季节差异与排放源和地面风场的关系.结果表明,中国对流层甲醛柱浓度呈西低东高的空间分布特征,且高值区域主要分布在华北平原、长江三角洲、珠江三角洲及四川盆地等人为源排放较高的中东部地区.中国甲醛柱浓度存在明显的季节差异,表现为夏季>秋季>春季>冬季.天然源VOCs和人为源VOCs排放均对甲醛柱浓度季节变化具有重要影响,光化学反应与气象条件在其中所起到的作用也不可忽略.生物源排放变化对甲醛年际变化趋势的影响不显著,中国东部地区甲醛柱浓度呈上升趋势主要是由于气候变率和人为因素的共同影响所致.更多还原

【Abstract】 Using the satellite derived HCHO column data from OMI, combined with MEGAN model and MEIC emission inventory, the characteristics of spatial and temporal distribution and long-term variation trend of tropospheric HCHO column over China during 2005—2016 were analyzed, and the seasonal variation of HCHO column in relation to emissions and surface wind field were investigated. The results were as follows. The spatial distribution of tropospheric HCHO column showed the pattern of high in the eastern and low in the western. Besides, central and eastern regions that concentrated with anthropogenic emissions showed high HCHO column, such as North China Plain, Yangtze River Delta, Pearl River Delta, and Sichuan Basin. The HCHO column over China displayed significant seasonal variation, the order was summer> autumn> spring> winter. Both biogenic and anthropogenic VOCs emissions had essential effects on the seasonal variation of HCHO column. In addition, the photochemical reactions and meteorological conditions also played non-ignorable role in seasonal variation of HCHO column. The upward trend of HCHO column in eastern China was mainly due to the combined effects of climatic variability and anthropogenic influences while the impact of changes in biogenic sources on the interannual variability of HCHO was not significant.更多还原