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Wang H.,Nanjing University of Information Science and Technology | Zhu B.,Nanjing University of Information Science and Technology | Shen L.,Jiaxing Environmental Monitoring Station | Xu H.,Zhejiang Institute of Meteorological science | And 4 more authors.
Aerosol and Air Quality Research | Year: 2016

There were 6 severe haze events over a large area of the Yangtze River Delta (YRD) region in January 2013. In this study, based on the hourly concentrations of trace gases and PM2.5 at 10 observation stations (8 city stations, 1 regional background station and 1 island station) during Jan. 1-31, 2013 as well as the concentrations of water-soluble ions at 5 stations (4 city stations and 1 regional background station) during Jan. 18-24, 2013 in the YRD region, the regional characteristics of the air pollutants during heavy haze episodes were investigated in combination with the atmospheric circulation patterns. The concentrations of PM2.5 on haze days were 1.6-2.4-fold higher than on clear days. The concentration of PM2.5, SO2, NO2 and CO increased significantly, with average values of 128.6, 48.5, 78.1 µg m-3 and 1.5 mg m-3 on haze days, and were 64.6, 36, 52.5 µg m-3 and 1.1 mg m-3 on clear days. The PM2.5 concentration of ten observation sites had positive correlations with CO and NO2, and had weakly negative correlations with O3. The sources of PM2.5, SO2, NO2 and CO were strong in inland cities and weak in coastal cities, and the sources of O3 were mainly from Wuxi, Suzhou and southeast of An’hui. The mass and water-soluble ion concentrations were both centralized in PM2.1 during the haze events; additionally, the NH4 +, SO4 2- and NO3 - ions were dominant, constituting 86-90.9% of the total ion concentrations in PM2.1. The mass spectra of NH4+, K+, Cl-, SO4 2-, F-, NO2 - and NO3 - had unimodal distributions. The secondary formations of sulfate dominated on haze days, and the nitrate oxidation rates were relatively high for inland cities and low for coastal cities. © Taiwan Association for Aerosol Research.

Liu D.-Y.,Wuxi Meteorological Observatory of Jiangsu Province | Pu M.-J.,Observatory of Jiangsu Province | Yan W.-L.,Observatory of Jiangsu Province | Xie Z.-Z.,Huaian Meteorological Observatory of Jiangsu Province
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2014

Based on the soundings of temperature, surface meteorological parameters, air pollutants concentration, the multi-day widespread fog-haze processes and the transformation between fog and haze during June 2012 at the downstream of the Huai River were investigated. Surface layer breeze provided nice dynamic conditions for the longtime maintain fog-haze; the neutrosphere or the inversion layer near the surface supplied a thermodynamic conditions; the large-scale crop residue burning provided enough condensation nucleus. During the haze-fog process, the visibility reduced with the wind speed decrease, and lifted with the wind speed increase. The formation and development of moderate and severe haze were accompanied with increasing specific humidity, while the haze-fog conversion processes were accompanied with decreasing specific humidity. The higher the specific humidity, the longer the fog-haze duration. The higher the specific humidity before the fog, the lower the minimum visibility during the fog. Visibility was positively correlated with the concentration of SO2 (Pearson correlation coefficients is 0.42), but was inversely correlated with PM2.5 and PM10 concentrations (Pearson correlation coefficients are -0.49 and -0.56, respectively). During the fog-haze processes, the upwind SO2, NO2 concentrations were higher than about 2times those of downwind. However, the downwind NO and PM10 concentrations were about 1.5 times higher than those of the upwind. Pollutants conversions occurred during the fog-haze processes.

Liu D.-Y.,Wuxi Meteorological Observatory of Jiangsu Province | Wei J.-S.,Observatory of Jiangsu Province | Yan W.-L.,Observatory of Jiangsu Province | Lu J.,Jiangsu Meteorological Information Center | Sun Y.,Observatory of Jiangsu Province
Huanjing Kexue/Environmental Science | Year: 2014

Based on the surface meteorological data of Jiangsu Province during 1980-2012, climatic characteristics and trends of the weather phenomenon of haze were analyzed. The result indicates that during 1980-2012, the haze day increased, and the severe and moderate haze days significantly increased. In the northern and coastal cities, haze days had a significant increase. Haze is often appeared in the fall and winter, and is rare in the summer, it also occurs inland, and is less in the coast. The haze happens more frequently in June since the straw burning during summer harvest time. The haze day was evenly distributed during the 80's, and increased during the 90's over southern and southwestern Jiangsu Province, middle and northern Jiangsu haze days had a growing after 2000, especially after 2010. The continuous, regional, and regional-continuous haze days were in an increasing trend. As the urban built-up area has been expanded each year, industrial emissions, coal consumption, and car ownership increase every year, resulting in regional temperature increase and relative humidity decrease, resulting in urban heat island and dry island effects. Thence the haze formation and maintenance conditions increased, which led to the increasing of haze days, and the continuous, regional and regional-continuous haze days were significantly increased.

Huaqing P.,Wuxi Meteorological Observatory of Jiangsu Province | Duanyang L.,Observatory of Jiangsu Province | Bin Z.,Wuxi Meteorological Observatory of Jiangsu Province | Yan S.,Wuxi Meteorological Observatory of Jiangsu Province | And 4 more authors.
Advances in Meteorology | Year: 2016

This paper analyzed the surface conditions and boundary-layer climate of regional haze events and heavy haze in southern Jiangsu Province in China. There are 5 types with the surface conditions which are equalized pressure (EQP), the advancing edge of a cold front (ACF), the base of high pressure (BOH), the backside of high pressure (BAH), the inverted trough of low pressure (INT), and saddle pressure (SAP) with the haze days. At that time, 4 types are divided with the regional haze events and each of which has a different boundary-layer structure. During heavy haze, the surface mainly experiences EQP, ACF, BOH, BAH, and INT which also have different boundary-layer structures. © 2016 Peng Huaqing et al.

Liu D.,Wuxi Meteorological Observatory of Jiangsu Province | Cao D.,Wuxi Meteorological Observatory of Jiangsu Province | Chen S.,Wuxi Meteorological Observatory of Jiangsu Province | Zhou B.,Wuxi Meteorological Observatory of Jiangsu Province | And 2 more authors.
Journal of Natural Disasters | Year: 2013

Dust storm at 1 - 2 May, 2011 influenced the Yellow Sea area, Shandong Province, Anhui Province, and Jiangsu Province, and worsened the air quality of cities on the north bank of Taihu Lake. In this research, using satellite monitoring images, air pollutant gas, pollutant particle visibilities and meteorological sounding data, the impacts of the sand dust weather on particles with different sizes and the air quality were analyzed, and the cause of this dust weather process was discussed as well. The results show that, the maximum concentrations of PM10, PM25-10 and PM 2 5 are 505.6 μg/m3,139.2 μg/m 3, and 367.3 μg/m3 respectively, and increased by 11 times, 26 times and 13 times , respectively compared to the situation before the dust storm. N02 mass concentration has the similar variation tendency with that of pollutant particles, but NO, S02, 0 3, and CO show opposite tendencies. The pH values of precipitation changed from 4. 9 before dust storm to 6. 42 after the storm, suggesting the rainwater changed from moderately acid to neutral. The electrical conductivity of precipitation varied from 87.5 us/cm to 162.7 us/cm, illustrating that the air pollution made the rainwater dirty.

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