The trend, seasonal cycle, and sources of tropospheric NO2 over China during 1997–2006 based on satellite measurement
The trend, seasonal cycle, and sources of tropospheric NO2 over China during 1997–2006 based on satellite measurement
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DOI：
10.1007/s11430-007-0141-6
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Xingying Zhang;Peng Zhang;Yan Zhang;Xiaojing Li;H. Qiu
中科院分区：
文献类型：
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作者：
Xingying Zhang;Peng Zhang;Yan Zhang;Xiaojing Li;H. Qiu
本文根据GOME和SCIAMACHY卫星观测资料，分析了我国对流层NO_2气柱浓度的时空分布特征。根据这些观测结果，确定了1997年至2006年间对流层NO2的月平均变化。并分析了其变化趋势和季节周期。本文讨论了特大城市上空对流层NO_2的可能来源。结果表明，由于人类活动的影响，我国东部地区对流层NO2浓度有较大的增长，尤其是在经济发展较快的工业区，如长江三角洲和珠江三角洲地区。我国特大城市对流层NO2浓度呈快速上升趋势。例如，上海在1997-2006年期间NO2柱以每年20%（参考年1997）的线性显著增长，这是所有选定城市中增长最快的。NO_2浓度季节分布在我国东西部存在差异。在中国东部地区，由于突出的人类活动和气象条件，在季节循环中发现了预期的冬季最大值。在西部，该循环在夏季显示出NO2最大值，这归因于自然排放，特别是土壤排放和闪电。机动车保有量与对流层NO2浓度之间存在显著的相关性，机动车保有量的快速增长可能是我国特大城市对流层NO2浓度升高的原因之一。
The characteristics of spatial and temporal distribution of tropospheric NO2column density concentration over China are presented, on the basis of measurements from the satellite instruments GOME and SCIAMACHY. From these observations, monthly averaged tropospheric NO2variations are determined for the period of 1997 to 2006. The trend and seasonal cycle are also investigated. The possible source of tropospheric NO2over megacity area is discussed in this paper. The results show a large growth of tropospheric NO2over eastern China, especially above the industrial areas with a fast economical growth, such as, Yangtze Rive Delta region and Pearl River Delta region because of the prominent anthropogenic activity. There is a rapid increase of tropospheric NO2over megacities in China. For instance, Shanghai had a linear significant increase in NO2columns of ∼20% per year (reference year 1997) in the period of 1997–2006, which is the rapidest increase among all the selected cities. The seasonal pattern of the NO2concentration shows a difference between the east and west in China. In the eastern part of China, an expected winter maximum in seasonal cycle is found because of the prominent anthropogenic activity and meteorological conditions. In the western part this cycle shows a NO2maximum in summer time, which is attributed to natural emissions, especially soil emissions and lightning. A quickly increasing vehicle population may contribute to the increase of tropospheric NO2over megacities in China for the remarkable correlation for vehicle population with tropospheric NO2.