香港港口近地面O 3 与氮氧化物浓度变化的多重分形特征

Q2 Environmental Science 环境科学研究 Pub Date : 2017-01-25 DOI:10.13198/J.ISSN.1001-6929.2017.01.14

乔中霞, 何红弟, 杨斌, 邢小虎

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Abstract

以2012年3月-2014年2月香港葵涌港口大气ρ（O3）、ρ（NO2）和ρ（NOx）的小时均值为研究对象，运用多重分形去趋势互相关分析法，对香港港口近地面ρ（O3）与ρ（NO2）和ρ（NOx）相互作用的多重分形特征进行研究.结果表明：香港港口O3 vs NO2[ρ（O3）vs ρ（NO2），下同]的h（2）（广义Hurst指数）为0.80，O3 vs NOx[ρ（O3）vs ρ（NOx），下同]的h（2）为0.79，二者的h（2）均大于0.5，表明ρ（O3）与ρ（NO2）、ρ（NOx）间均存在显著的长程交叉相关性.港口ρ（O3）与ρ（NO2）、ρ（NOx）相互关系的多重分形特性在日际和季节上存在显著差异，其中夜晚的O3 vs NO2的Δα（分形强度指数）为0.92，O3 vs NOx的Δα为0.81，而白天二者的Δα分别为0.59和0.43，说明夜晚的多重分形特征明显强于白天；Δα为春季>夏季>秋冬，表明多重分形程度在春季最强，夏季次之，秋冬季最弱，可能与港口特殊的地理位置和气候条件有关.研究显示，在构建港口ρ（O3）的预测模型时，需要考虑不同的时间尺度、不同气象条件下ρ（O3）与ρ（NO2）、ρ（NOx）相关性的多重分形特征的差异性.

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Multifractal characteristics of changes in surface O 3 and nitrogen oxide concentrations near Hong Kong ports

From March 2012 to February 2014, Hong Kong's Kwai Chung Port Atmosphere ρ (O3) ρ (NO2) and ρ The hourly mean of (NOx) is the research object, and the multifractal de trend cross correlation analysis method is used to analyze the near surface of Hong Kong ports ρ (O3) and ρ (NO2) and ρ The multifractal characteristics of (NOx) interactions were studied. The results showed that O3 vs NO2 in Hong Kong ports[ ρ (O3) vs ρ The h (2) (generalized Hurst index) of (NO2) is 0.80, O3 vs NOx[ ρ (O3) vs ρ The h (2) of (NOx) is 0.79, and the h (2) of both is greater than 0.5, indicating that ρ (O3) and ρ (NO2) ρ There is a significant long-range cross correlation between (NOx). Ports ρ (O3) and ρ (NO2) ρ There are significant differences in the multifractal characteristics of the relationship between (NOx) during the day and season, with O3 at night vs. NO2 Δα (Fractal strength index) is 0.92, O3 vs. NOx Δα Is 0.81, while during the day, both Δα The values are 0.59 and 0.43 respectively, indicating that the multifractal characteristics at night are significantly stronger than during the day; Δα The degree of multifractality is strongest in spring, followed by summer, and weakest in autumn and winter, which may be related to the special geographical location and climatic conditions of the port. Research shows that in constructing the port, the degree of multifractality is strongest in spring, followed by summer, and weakest in autumn and winter ρ When predicting (O3), it is necessary to consider different time scales and meteorological conditions ρ (O3) and ρ (NO2) ρ The difference in multifractal characteristics of (NOx) correlation

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