摘要
基于GOME和SCIAMACHY的对流层NO2卫星遥感数据，分析了1996～20lO年中国对流层NO2柱浓度的时空变化特征。首先采用余弦函数拟合模型对NO2遥感数据中的无效值进行了修正，然后分析了NO2的空间分布与年际变化趋势。研究表明：中国对流层NO2的空间差异明显，西部地区15a平均对流层NO2柱浓度大多在0．5×10^15mol／cm^2以下，而东部地区则大多在3．0×10^15mol／cm^2以上。华北平原、长江三角洲、珠江三角洲和辽东半岛这4个经济发达地区的对流层NO2浓度特别突出，均高于15×10^15mol／cm^2。1996～2010年中国区域对流层NO2柱浓度呈现明显的上升趋势，由1996年的1．48×10^15mol／cm62升高至2010年的3．52×10^15mol／cm^2。中国对流层NO2浓度年变化率分布特征与NO2浓度分布特征相似，均体现出东部高西部低的特点。西部地区对流层NO2浓度呈现出下降趋势，年变化率多在-0．05×10^15mol／cm^2／yr以内。而东部地区对流层NO2浓度基本呈现增长趋势，年增长率一般高于0．15×10^15mol／cm^2／yr，其中华北平原、长江三角洲、珠江三角洲和辽东半岛这4个NO2高值区的年增长率最为突出（高于0．8×10^15mol／cm^2／yr）．
The spatio temporal variations of the troposhperic NO2 over China for the period 1996-2010 are analyzed on the basis of the GOME and SCIAMACHY troposhperic column NO2 data. First,a cosine fitting model was employed to correct the invalid values in troposhperic NO2 remote sensing data. Then the spatial distribution and temporal variation of NO2 were studied. Results indicate that the spatial pattern of troposhperic NO2 over China shows significant difference between western and eastern areas. The 15-year average troposhperic column NO2 is lower than 0.5×10^15mol/cm^2 for most of western areas,while it is higher than 3.0 ×10^15mol/cm^2 for most of eastern areas. The North China Plain, Yangtze River Delta,Pearl River Delta and Liaodong Peninsula exhibit extremely high NO2 values （〉15×10^15mol/cm^2） ,which implys that regions with high NO2 concentrations correspond to the regions with fast economic developments. During the period of 1996-2000,the annual average troposhperic column NO2 over China increases from 1.48×10^15mol/cm^2 in 1996 raises to 3.52 ×10^15mol/cm^2 in 2010,suggesting an obvious growth of NO2 emissions. The geographic distribution of inter annual trend of troposhperic NO2 over China shows similar pattern with that of 15-year average troposhperic NO2. Reductions in troposhperic NO2 are detected over western area,with the annual trend ranges between -0.05×10^15mol/cm^2/yr and 0. Meanwhile, large increases of troposhperic NO2 are observed over the eastern areas, with the annual trend mostly is higher than 0.15 ×10^15mol/cm^2/yr. The North China Plain,Yangtze River Delta,Pearl River Delta and Liaodong Peninsula which characterized as high NO2 concentration areas show the most remarkable increasing trends （mostly higher than 0.8×10^15mol/cm^2/yr）.
出处
《遥感技术与应用》
CSCD
北大核心
2013年第5期898-903,共6页
Remote Sensing Technology and Application
基金
江苏高校优势学科建设工程资助项目
国家自然科学基金项目(41201369)
城市气象科学研究基金项目(IUMKY&UMRF201102)
