[Characteristics of Aerosol Particulate Concentrations and Their Climate Background in Shanghai During 2007-2016].

We use daily aerosol particulate matter<10 μm (PM ₁₀ ) concentration data from 2006 to 2016 in Shanghai along with meteorological elements (wind and temperature), atmospheric stability, temperature inversion, and upper atmosphere circulation data, to analyze the variation characteristics of the PM ₁₀ concentrations and differences of the winter climate background. We establish a multivariate linear stepwise regression equation, and also compare and analyze differences in the upper atmospheric circulation by selecting the years with the highest and lowest PM ₁₀ concentrations. The results showed an oscillating downward trend in the annual average concentrations of PM ₁₀ in Shanghai, whereas seasonally, PM ₁₀ concentrations were relatively high in winter and showed two peaks with a low in between. PM ₁₀ concentrations were negatively correlated with the daily average wind speed and the daily mixing layer height at 20:00, and positively correlated with the frequency of northwest wind, the mean daily temperature, and the frequency of stable weathers and thermal inversion at 20:00. When the 500 hPa height field in the northern part of China was a positive anomaly in winter, a warm winter prevailed and led to high PM ₁₀ concentrations. When the 500 hPa height field was a negative anomaly, cold air frequently moved southward to result in relatively low temperatures, which caused relatively low PM ₁₀ concentrations. When the wind field at 850 hPa was easterly, the wind speed was relatively large and resulted in relatively low PM ₁₀ concentrations.