Temporal variation of urban NO x concentration in India during the past decade as observed from space
Temporal variation of urban NO x concentration in India during the past decade as observed from space
复制标题
从太空观察过去十年印度城市氮氧化物浓度的时间变化
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
R. van der A
中科院分区：
文献类型：
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作者：
S. Ghude;P. Kulkarni;S. Kulkarni;S. Fadnavis;R. van der A
大气制图扫描成像吸收光谱仪（SCIAMACHY）对流层NO2反演（2003-2006年3 - 4 - 5月期间的平均值）被用来定位印度主要的城市NO2源。为了表明卫星对对流层NO2的测量可以提供有关城市NO2浓度日常变化的有用信息，我们将德里一个测量点获得的地表空气NO2浓度的2年（2004年10月至2006年10月）记录与臭氧监测仪（OMI）观测的对流层NO2柱检索进行了比较。城市尺度卫星观测与地面测量之间的相关性质量（45%）为调查主要城市地区本地排放的时间变化提供了信心。1996年3月至2007年12月期间的全球臭氧监测实验和科学仪器测量数据被用来计算选定城市地点的趋势。应用统计分析得出这些地点在此期间的趋势。这11年的月NO2柱的时间序列拟合的线性函数叠加在一个年度的季节循环。我们发现印度主要城市的对流层NO2水平在统计上显着增加。具有积极趋势的显著城市地点是城市人口迅速增长的城市。
Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) tropospheric NO2 retrievals (average during March–April–May 2003–2006) were used to locate the major urban sources of NO2 in India. To show that tropospheric NO2 measurements from satellites can provide useful information on day-to-day changes in urban NO2 concentration, we compared 2-year (October 2004–October 2006) records of surface air NO2 concentrations obtained at one of the measurement sites in Delhi to retrievals of tropospheric NO2 columns from Ozone Monitoring Instrument (OMI) observations. The quality of correlation between satellite observations at the urban scale and surface measurements (45%) provided confidence to investigate the temporal changes in the local emission over major urban locations. Combined Global Ozone Monitoring Experiment (GOME) and SCIAMACHY measurements for the period March 1996–December 2007 were used to compute the trends over the selected urban locations. A statistical analysis was applied to derive trends for this period over these locations. The time series of the monthly NO2 columns for these 11 years were fitted with a linear function superposed on an annual seasonal cycle. We found a statistically significant increase in tropospheric NO2 levels over the major urban cities in India. Notable urban locations of positive trends were found to be the cities where the urban population is growing rapidly.