Studies On The Influence Of Meteorological Factors On Airborne Particulate Matters In The Vertical Gradient

In this paper, airborne particulate matter is an important factor affecting the quality of atmospheric environment and human health, to understand the dynamic changes of airborne particulate matter is important in urban governance environment. we used DUSTMATE fume and dust detector to supervise the mass concentrations of airborne particles matter (PM) at different canopy heights (2,7,14 m) in the north park of the Olympic Forest Park day and night, And combined with the meteorological data measured simultaneously, the influence of meteorological conditions on PM concentrations with 4 kinds of particulate diameters was investigated by using non-parameter statistical analysis. In order to analyz the diurnal variation and vertical distribution characteristics of PM concentrations with 4 kinds of particulate diameters (TSP, PM10, PM2.5, PM1.0) of different canopy heights in different seasons. The preliminary draw the following conclusions:1) The correlation between TSP and PM10, PM2.5, PM1.0 decreases with decreasing particle size, with canopy heights increases, decreases the correlation coefficient in summer, other seasons are the opposite. The ratio of PM10, PM2.5, PM1.0 and TSP decreases with decreasing particle size, increased with the increase of heights (except in summer).2) Correlation between PM10 and PM2.5 in winter, PM1.0 increases with decreasing particle size, the rest of the season is on the contrary. With the canopy heights increases, the correlation coefficient PM2.5, PM1.0 summer PM10 reduce gradually, in autumn, spring and winter increased first and then decreased. The ratio of PM2.5 and PM10, PM1.0 and PM10 decreases with decreasing particle size, increased with the increase of canopy heights (except in summer).3) There is a good correlation between PM2.5 and PM1.0 in different seasons. With the canopy heights increases, the correlation becomes weaker in summer, other seasons are the opposite. The ratios of different season, different heights of PM1.0 and PM2.5 are very similar.4) Spring, autumn, winter air particles and relative humidity was positively correlated, negatively correlated with pressure, temperature, wind speed, the summer air particles and positively related with the temperature, air pressure, wind speed, relative humidity was negatively correlated, the correlation between the vertical gradient of air particles and meteorological elements of each are not identical. With the canopy heights increases, the wind speed increases, the temperature gradually increased in the 19:00-08:00 range, the 09:00-18:00 range reduced gradually.5) The horizontal distribution of air particles, low in daytime, evening and morning high, daily changing amplitude with canopy heights increased gradually become smaller. The vertical gradient, the change trends of the TSP, PM10, PM2.5, PM1.0 concentration on very similar. Low during the day and night peak has been lagging.6) The spring air particles average mass concentration increases as the heights increases, the other seasons are the opposite.2 m to 7 m, the amplitude of variation of air particulate matter:Winter> autumn> spring> summer; 2 m to 14 m, the amplitude of variation of air particles matter:Autumn> spring> winter> summer; 7 m to 14 m, the amplitude of variation of air particles matter:Autumn> summer> winter> spring.