Variations of the increasing trend of tropospheric NO2 over central east China during the past decade
Variations of the increasing trend of tropospheric NO2 over central east China during the past decade
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DOI：
10.1016/j.atmosenv.2007.02.009
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发表时间：
2007-07
影响因子：
5
通讯作者：
Youjiang He;I. Uno;Zifa Wang;T. Ohara;N. Sugimoto;A. Shimizu;A. Richter;J. Burrows
中科院分区：
文献类型：
--
作者：
Youjiang He;I. Uno;Zifa Wang;T. Ohara;N. Sugimoto;A. Shimizu;A. Richter;J. Burrows
从气候学角度出发，利用区域化学传输模式（CTM）进行了数值分析，并与全球臭氧监测实验（GOME）和扫描成像吸收光谱仪大气层析（SCIAMACHY）卫星NO2测量的1996 - 2005年东亚地区进行了比较。建模结果在地理分布格局上与卫星反演结果吻合较好，但绝对值被系统低估。定量分析了2000年以后中国中东部地区NO2垂直柱密度（VCD）的急剧增加（卫星观测14.1-20.5%yr-1，模式模拟10.8%yr-1）。不同的排放增长模式是造成北京大城市群（BJ）、长江三角洲（YD）和其他CEC区域不同增长趋势的原因。卫星观测和CMAQ模型模拟的长江口NO2浓度增长率远高于其他地区，没有明显的季节变化。除北京和丹东外，CEC内其他地区的NO2排放量也有较大幅度的增加。
A numerical analysis using a regional chemical transport model (CTM) is presented in comparison with Global Ozone Monitoring Experiment (GOME) and SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) satellite NO2measurements over East Asia from 1996 to 2005 from a climatological perspective. Modeling results agree well with satellite retrievals in geographical distribution patterns, with systematic underestimation of the absolute values. The sharp increase in NO2vertical column densities (VCDs) over central east China (CEC) after the year 2000 (14.1–20.5%yr−1for the satellite observations and 10.8%yr−1for model simulations) is analyzed quantitatively over different megacity clusters. The distinct emission increase patterns are responsible for the different increase trends observed over the Beijing megacity cluster (BJ), the Yangtze Delta (YD) and other CEC regions. The growth rate of satellite measured and CMAQ-modeled NO2VCDs for the YD is much higher than that in other regions, with no clear seasonal variation. Apart from BJ and YD, NO2emissions from other regions in CEC also expand considerably.