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- 2017
雾霾与GPS对流层天顶延迟相关性探究
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Abstract:
利用国际GNSS服务（International GNSS Service，IGS）提供的对流层天顶延迟（zenith path delay， ZPD）产品，研究其与雾霾的相关性，并探究了造成雾霾的“元凶”——悬浮颗粒物与气压、温度和湿度的变化关系。首先，研究了中国境内4个IGS站30 d的日平均ZPD与量化评定雾霾的空气质量指数（air quality index， AQI）的变化趋势，发现二者基本同步增大（减小）。内陆3个站点的相关系数绝对值均大于0.5，说明ZPD与表征雾霾的AQI有着较强的相关关系，雾霾对对流层延迟产生影响。其次，对1 h采样率的北京房山空气质量分指数（individual air quality index， IAQI）与ZPD进行分析，二者的变化趋势基本一致，其中PM2.5、PM10、AQI与ZPD的相关系数分别为0.504 2、0.539 1和0.555 4。同时，当AQI达到300以上重度污染时，会对ZPD产生5 cm以上差值的显著影响。最后，利用IGS的M文件探究了北京房山各IAQI与气压、温度、湿度24 h变化，一天中IAQI、气压、湿度均呈“U”变化趋势，而温度则呈现倒“U”变化，说明雾霾的形成与气压、温度、湿度相关，并利用逐步线性回归给出了概略模型
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