基于ＧＩＳ的乌鲁木齐市ＮＯ２ 时空分布特征

以乌鲁木齐市2008-2012年7个空气自动监测点位小时浓度数据为基础数据，利用ArcGIS 技术，分析了其NO2年变化、月变化、日变化、空间分布等污染特征。结果表明，NO2年均值为0．065～0．068 mg/m3，基本保持稳定；NO2呈明显的季节变化，冬季污染较重，春节、秋季次之，夏季空气质量相对较好；NO2呈现“单峰型”的日变化特征，夜间NO2明显高于白天；不同季节 NO2的空间分布特征不同，与交通、供暖、人口密度、地理位置密切相关；NO2分布与风速相关关系明显，而与气温、湿度的关系为非线性。

The Spatial and Temporal Distribution of NO2 Based on GIS Analysis in Urumqi

In this paper,the writer,using ArcGIS technology,analyzes the pollution characteristics of NO2 annual change,monthly change,diurnal variation and the spatial distribution,based on the hourly concentration data of seven air automatic monitoring sites in Urumqi from 2008 to 2012.The results show that the annual average of NO2 is 0.065 ~0.68 mg/m3 ,which is basically stable. But there is a seasonal variation：the pollution in winter is serious;spring and autumn is better than winter;air quality in summer is relatively good.And the diurnal variation of NO2 presents ＆quot;single peak type＆quot;：NO2 concentration at night is significantly higher than the day.Besides,spatial distribution characteristics of NO2 varied in different seasons,and it is closely related to transportation, heating,population density,location;NO2 distribution has an obvious correlation with wind speed,and its relationship with temper-ature and humidity is nonlinear.