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首页> 外文期刊>Journal of Atmospheric Chemistry >Trace gases at a semi-arid urban site in western India: variability and inter-correlations
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Trace gases at a semi-arid urban site in western India: variability and inter-correlations

机译：印度西部半干旱城市地区的痕量气体：变异性和相互关系

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Continuous measurements of O-3, CO, NOx and SO2 were made in Ahmedabad, a semi-arid, urban region in western India, during May-October, 2011 to study their levels, variability and inter-relationships during this period of changing meteorological conditions. The levels of CO and SO2 observed in Ahmedabad were in general not very high compared to other major urban regions in India. On the other hand, NOx levels, impacted by vehicular emissions, were found to be substantially elevated. However, these values are still lower than levels in megacities like Beijing, Hong-Kong, Mexico etc. A sudden increase in trace gas levels was observed during post-monsoon months due to a concurrent change in prevailing winds. The levels, variability as well as diurnal amplitudes for all the gases were particularly high during October. While the primary pollutants were negatively correlated with wind speed, O-3 interestingly showed a positive association. Low slope and relatively lower correlation between O-3 and CO in Ahmedabad indicate incomplete photochemical processes in the ambient air. Despite an overall inverse relationship between O-3 and NOx, daytime O-3 was found to be positively correlated with night-time NOx as well as night-time CO. Levels of CO, NOx and SO2 showed unique relationships with wind direction depending on source locations. Low CO-NOx slope for Ahmedabad indicate relatively fresh emissions from local sources. SO2 values as well as SO2/NOx ratios were higher when wind was from the eastern sector of the city, which contains a thermal power station and a few industrial clusters. The SO2/NOx slope for point sources in Ahmedabad is estimated to be 0.4 while for mobile sources, it is 0.026.
机译：2011年5月至10月，在印度西部半干旱的城市艾哈迈达巴德，对O-3，CO，NOx和SO2进行了连续测量，以研究在此变化的气象期间它们的水平，变异性和相互关系条件。与印度其他主要城市地区相比，在艾哈迈达巴德观察到的一氧化碳和二氧化硫含量总体上不是很高。另一方面，发现受车辆排放影响的NOx水平显着升高。但是，这些值仍低于北京，香港，墨西哥等大城市的水平。在季风后的几个月中，由于盛行风的同时变化，微量气体水平突然增加。在十月份期间，所有气体的水平，变异性和昼夜振幅都特别高。尽管主要污染物与风速呈负相关，但O-3有趣地显示出正相关。艾哈迈达巴德的低坡度和O-3与CO之间的相关性相对较低，表明环境空气中的光化学过程不完整。尽管O-3与NOx之间总体上呈反比关系，但白天O-3与夜间NOx以及夜间CO呈正相关。CO，NOx和SO2的含量与风向呈独特关系，具体取决于源位置。艾哈迈达巴德的CO-NOx斜率低表明本地来源的排放相对较新。当风来自城市的东部地区时，SO2值以及SO2 / NOx比率会更高，该地区包括一个火力发电厂和一些工业集群。艾哈迈达巴德点源的SO2 / NOx斜率估计为0.4，而移动源的SO2 / NOx斜率为0.026。

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