乌鲁木齐北部郊区NO2柱浓度特征研究

郊区是NO₂不可忽视的排放源。基于地基多轴差分吸收光谱技术（Multi-Axis Different Optical Absorption Spectroscopy，即MAX-DOAS），分析乌鲁木齐北部郊区（农业区）对流层NO₂垂直柱浓度（vertical column densities，即VCD）特征，以了解其变化规律和分布特点。研究表明:观测期间，每天NO₂柱浓度高度不同，但是每天的变化趋势基本相同，早上NO₂柱浓度比较高，11:00左右达到第1峰值；2017年3月3—16日NO₂平均柱浓度11.58×10¹⁵ molec/cm²；5月8—19日的日变化趋势更显著，第1峰值出现在10:00左右，比3月份要早，NO₂柱浓度平均值为7.42×10¹⁵ molec/cm²；3月份和5月份乌鲁木齐郊区（农业区）NO₂柱浓度变化整体趋势相当，符合双峰的变化，3月份NO₂柱浓度大于5月份NO₂柱浓度。

A study on NO2 vertical colum densities in suburban area of northern Urumqi

Suburbs are the important emission sources of NO₂，which is not be ignored.Based on ground Multi-Axis Different Optical Absorption Spectroscopy，this research focused on the tropospheric atmospheric concentrations of NO₂ vertical column distribution（VCD） and changes over the suburban area and field of Urumqi City，studying its variation and distribution characteristics.The results showed that:concentrations of NO₂ vertical column distribution were different every day but it showed a close trend of variation，and it was higher in the morning，11:00 am witnesses the first maximum；it′s average read 11.58×10¹⁵ molec/cm² from 3th to 16rd in March；the daily variation was more obvious，10:00 am witnesses the first maximum；it′s average read 7.42×10¹⁵ molec/cm² from 8th to 19rd in May；the trend of variation in March and May were generally close to each other in the suburban area and agricultural area，which showed a dual maximum，and the NO₂ VCD was higher in March than that in May.