新疆绿洲城市夏季农田区对流层NO_2垂直柱浓度特征分析

2014年夏季6~8月利用地基多轴差分吸收光谱仪(MAX DOAS)在新疆绿洲城市乌鲁木齐市三道坝镇、库尔勒市西尼尔镇及博乐市84团农田区观测的NO_2垂直柱浓度(VCD)数据,结合同期的气象数据分析了NO_2VCD的变化特征。研究表明:1NO_2气体的日变化规律在乌鲁木齐市和库尔勒市农田区呈波浪式多峰特征,博乐市农田区呈明显的双峰形式,且峰值除了库尔勒市在午后外,乌鲁木齐市和博乐市均出现在早晚时段;2新疆绿洲城市农田区在夏季6月(3.327×1015molec/cm~2)的NO_2VCD最高,其次是7月(2.002×1015molec/cm~2),最低是8月(1.656×1015molec/cm2);3NO_2VCD与气温、水汽压气象要素密切相关;由于城市间地势、格局的差异,库尔勒市的NO_2浓度与风速呈显著正相关,乌鲁木齐市、博乐市的NO_2浓度与风速相关性不显著。

Characteristic Analyzed on NO2 Tropospheric Column Concentrait ons of Xinjiang Oasis Farmland Area in Summer

Based on the measurements by Multi -Axis Differential Optical Absorption Spectroscopy ( MAX-DOAS) at Three Tao ba town of Urumqi ,Xinier town of Korla ,84 Corps of Bole in Xinjiang Oasis , from June to August of 2014 ,the tropospheric vertical column density ( VCD) of NO2 on farmland area in Xinjiang Oasis cities was retrieved and its changed characteristics were analyzed .The results showed that diurnal variation of NO 2 VCD on farmland in Urumqi and Korla oasis cities were charac-teristics of wave-shape curve with multimodal peak values .Bole cities was characteristics of bimodal peak ,Urumqi and Bole were peaked at morning and eight times .Korla was peaked at afternoon .The maximum value of NO2 VCD was 3.327 ×1015 molec/cm2 in June,the median value of NO2 VCD was 2.002 ×1015 molec/cm2 in July,and the minimum value of NO2 VCD was 1.656 ×1015 molec/cm2 in August.The temperature and water vapor pressure had greatly impacted on NO 2,the farmland area NO2 concentration was positively correlated with wind speed in Korla city;The farmland area NO2 concentration was nega-tively correlated with wind speed in Urumqi and Bole city .