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Reduction in NO_x Emission Trends over China: Regional and Seasonal Variations

机译：中国NO_x排放趋势的减少：区域和季节变化

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摘要

We analyzed satellite observations of nitrogen dioxide (NO_2) columns by the Ozone Monitoring Instrument (OMI) over China from 2005 to 2010 in order to estimate the top-down anthropogenic nitrogen oxides (NO_x emission trends. Since NO_x emissions were affected by the economic slowdown in 2009, we removed one year of abnormal data in the analysis. The estimated average emission trend is 4.01 ± 1.39% yr~(-1), which is slower than the trend of 5.8-10.8% yr~(-1) reported for previous years. We find large regional, seasonal, and urban-rural variations in emission trends. The average NO_x emission trend of 3.47 ± 1.07% yr~(-1) in warm season (June-September) is less than the trend of 5.03 ± 1.92% yr~(-1) in cool season (October-May). The regional annual emission trends decrease from 4.76 ± 1.61% yr~(-1) in North China Plain to 3.11 ± 0.98% yr~(-1) in Yangtze River Delta and further down to -4.39 ± 1.81% yr~(-1) in Pearl River Delta. The annual emission trends of the four largest megacities, Shanghai, Beijing, Guangzhou, and Shenzhen are -0.76 ± 0.29%, 0.69 ± 0.27%, -4.46 ± 1.22%, and -7.18 ± 2.88% yr~(-1), considerably lower than the regional averages or surrounding rural regions. These results appear to suggest that a number of factors, including emission control measures of thermal power plants, increased hydro-power usage, vehicle emission regulations, and closure or migration of high-emission industries, have significantly reduced or even reversed the increasing trend of NO_x emissions in more economically developed megacities and southern coastal regions, but their effects are not as significant in other major cities or less economically developed regions.
机译：为了分析自上而下的人为氮氧化物（NO_x排放趋势，由于经济放缓对NO_x排放的影响，我们使用2005年至2010年间的臭氧监测仪（OMI）对卫星对二氧化氮（NO_2）柱的观测进行了分析。在2009年，我们从分析中删除了一年的异常数据，估计的平均排放趋势为4.01±1.39％yr〜（-1），比报告的5.8-10.8％yr〜（-1）的趋势要慢。在过去的几年中，我们发现排放趋势存在较大的区域，季节和城乡变化，暖季（6月至9月）的平均NO_x排放趋势为3.47±1.07％yr〜（-1），小于5.03的趋势。寒冷季节（10月至5月）±1.9％yr〜（-1）。区域年排放趋势从华北平原的4.76±1.61％yr〜（-1）降至3.11±0.98％yr〜（-1）长三角地区的yr〜（-1）下降到-4.39±1.81％yr〜（-1）。上海，北京，广州和深圳的yr〜（-1）为-0.76±0.29％，0.69±0.27％，-4.46±1.22％和-7.18±2.88％yr〜（-1），大大低于区域平均水平或周边农村地区。这些结果似乎表明，许多因素，包括火力发电厂的排放控制措施，水电使用增加，车辆排放法规以及高排放行业的关闭或迁移，已大大降低甚至扭转了这一趋势。经济发达的大城市和南部沿海地区的NO_x排放量，但其影响在其他主要城市或经济欠发达的地区并不那么显着。

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  • 来源
    《Environmental Science & Technology》 |2013年第22期|12912-12919|共8页
  • 作者

    Dasa Gu; Yuhang Wang; Charles Smeltzer; Zhen Liu;

  • 作者单位

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332-0340, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332-0340, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332-0340, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332-0340, United States,Combustion Research Facility, Sandia National Laboratories, Livermore, CA, U.S.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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