In January 2013, China suffered large-scale haze weather four times, affecting 30 cities in all. The average number of haze weather days in many regions was higher than the same period in every year since 1961. PM2.s,...In January 2013, China suffered large-scale haze weather four times, affecting 30 cities in all. The average number of haze weather days in many regions was higher than the same period in every year since 1961. PM2.s, which is defined as fine particulate matter with an aerodynamic diameter of 2.5 micrometers or less, is the main health hazard in the context of haze weather. It can carry large amounts of poisonous and harmful substances, and penetrate deep into the lungs and blood circulation through the respiratory tract, thereby affecting human health.展开更多
From December 3 to 12,2017,Zhangzhou experienced a haze weather process lasting for 10 days.In this paper,based on surface meteorological observation and environmental monitoring data,statistical comparison,Eta correl...From December 3 to 12,2017,Zhangzhou experienced a haze weather process lasting for 10 days.In this paper,based on surface meteorological observation and environmental monitoring data,statistical comparison,Eta correlation coefficient,clustering analysis and other methods were adopted to analyze the causes of haze weather in the whole process from clean air (December 2) to haze generation,maintenance (December 3-12) and dissipation (December 13).The results showed that two blasts of strong cold air invaded the city during the haze formation and maintenance,and regional pollution transport and static and stable weather were the main reasons for the continuous high concentration of particulate matter,the occurrence of mild pollution from PM 10 and PM 2.5 in some periods and mild-heavy haze weather lasting for 10 days.In this process,PM concentration had a strong negative correlation with air temperature and visibility,and the absolute values of the correlation coefficients were between 0.6 and 0.8.PM concentration correlated with relative humidity positively and with wind speed weakly.Regional transport of particulate matter and ozone was conducted in the form of northeast wind and southeast wind backflow.At night and in the morning,under the influence of static and stable weather and long-term sea and land breeze (6 d),average wind speed was less than 1.5 m/s,and the frequency of static wind and small wind exceeded 50%,while there was no precipitation.At 08:00,in the middle and low altitudes,the inversion layer appeared in one week,and cloud cover was large,while the height of mixed layer was below 600 m.In the whole process,it was in the weak divergence field under cold high pressure,and the overall diffusion,dilution and cleaning ability of the atmosphere were poor.展开更多
文摘In January 2013, China suffered large-scale haze weather four times, affecting 30 cities in all. The average number of haze weather days in many regions was higher than the same period in every year since 1961. PM2.s, which is defined as fine particulate matter with an aerodynamic diameter of 2.5 micrometers or less, is the main health hazard in the context of haze weather. It can carry large amounts of poisonous and harmful substances, and penetrate deep into the lungs and blood circulation through the respiratory tract, thereby affecting human health.
基金Supported by National Natural Science Foundation of China(U14052235)National Natural Science Foundation of Zhangzhou(ZZ2018J03)Shengzhou Environmental Protection Bureau([350600]ZY[GK]2018003-1)
文摘From December 3 to 12,2017,Zhangzhou experienced a haze weather process lasting for 10 days.In this paper,based on surface meteorological observation and environmental monitoring data,statistical comparison,Eta correlation coefficient,clustering analysis and other methods were adopted to analyze the causes of haze weather in the whole process from clean air (December 2) to haze generation,maintenance (December 3-12) and dissipation (December 13).The results showed that two blasts of strong cold air invaded the city during the haze formation and maintenance,and regional pollution transport and static and stable weather were the main reasons for the continuous high concentration of particulate matter,the occurrence of mild pollution from PM 10 and PM 2.5 in some periods and mild-heavy haze weather lasting for 10 days.In this process,PM concentration had a strong negative correlation with air temperature and visibility,and the absolute values of the correlation coefficients were between 0.6 and 0.8.PM concentration correlated with relative humidity positively and with wind speed weakly.Regional transport of particulate matter and ozone was conducted in the form of northeast wind and southeast wind backflow.At night and in the morning,under the influence of static and stable weather and long-term sea and land breeze (6 d),average wind speed was less than 1.5 m/s,and the frequency of static wind and small wind exceeded 50%,while there was no precipitation.At 08:00,in the middle and low altitudes,the inversion layer appeared in one week,and cloud cover was large,while the height of mixed layer was below 600 m.In the whole process,it was in the weak divergence field under cold high pressure,and the overall diffusion,dilution and cleaning ability of the atmosphere were poor.
