Identifying the impacts of climate on the regional transport of haze pollution and inter-cities correspondence within the Yangtze River Delta

Environmental Pollution
Hang XiaoLei Tong

Abstract

Regional haze pollution has become an important environmental issue in the Yangtze River Delta (YRD) region. Regional transport and inter-influence of PM2.5 among cities occurs frequently as a result of the subtropical monsoon climate. Backward trajectory statistics indicated that a north wind prevailed from October to March, while a southeast wind predominated from May to September. The temporal relationships of carbon and nitrogen isotopes among cities were dependent on the prevailing wind direction. Regional PM2.5 pollution was confirmed in the YRD region by means of significant correlations and similar cyclical characteristics of PM2.5 among Lin'an, Ningbo, Nanjing and Shanghai. Granger causality tests of the time series of PM2.5 values indicate that the regional transport of haze pollutants is governed by prevailing wind direction, as the PM2.5 concentrations from upwind area cities generally influence that of the downwind cities. Furthermore, stronger correlation coefficients were identified according to monsoon pathways. To clarify the impacts of the monsoon climate, a vector autoregressive (VAR) model was introduced. Variance decomposition in the VAR model also indicated that the upwind area cities contributed significa...Continue Reading

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