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Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.], 2008
Based on the TRACE-P emission data and a Shanghai local emission inventory, the regional air quality model Models-3/CMAQ was applied with the mesoscale model MM5 to simulate the distribution and transport status of O3 and PM10 in the Yangtze River Delta (YRD) in January and July 2001. Ten days' hourly monitoring data at Shanghai monitoring sites were used to verify the model performance. Results show that the correlation coefficients between monitoring and simulation data of O3 and PM10 are 0.77 and 0.52, and the indices of agreement reach 0.81 and 0.99, respectively. The Models-3 simulation shows a 27% underestimation of the maximum O3 hourly concentration, but performs well in average O3 hourly concentration simulation with a normalized bias of -3.1%. The model shows a 10% underestimation of the average PM10 hourly concentration, with a normalized bias of 46%. Models-3/CMAQ has the ability to simulate the processes of air pollution transport in the YRD, and the model results a...
Pollution Characteristics and Assessment of Heavy Metals in Water from the Dongliao River
Advances in Environmental Protection, 2019
The concentrations of heavy metals including Fe, Mn, Cu, Ni, Pb, Cd in the Dongliao River were determined to illustrate the distribution characteristics of heavy metals. Heavy metal pollution index (HPI) method was used to evaluate pollution levels of heavy metals. The results showed that the contents of heavy metals except Pb were in line with the surface water quality standard III. The HPI of the Dongliao River was 26.1930 at an acceptable level.
Acta Ecologica Sinica, 2014
Numerous studies have shown that ecological factor changes along the spatial gradient of urban and rural sites have a strong similarity to the temporal gradient of global change. Therefore, based on environmental gradients between urban and rural areas, a space鄄for鄄time substitution experiment called the " urban nature experimental field冶 method is developed to research the response of the terrestrial ecosystem to global climatic change. In recent related studies, the characteristics of ecological factors in urban and rural areas were observed in many cities around the world, most of which were focused on temperature and carbon dioxide. However, some reports showed that the disturbance from near鄄ground ozone was one of the most influential factors in determining the effectiveness and applicability of the method. To date, little research has been carried out to monitor and identify the spatial variation of near鄄ground ozone concentrations along the urban鄄rural gradient. Therefore, we selected the following urban and rural forest sites: the urban site in Qingliangshan Park near the urban center of Nanjing, and the rural site in Xiashu at 41. 7 km distance from the Nanjing city center. We monitored near鄄ground ozone concentrations, as well as light intensity, air temperature and humidity, from June 2011 to January 2013. We also compared diurnal and seasonal variation of ozone concentration. The results suggest that there were significant differences of temperature, humidity and maximum light intensity between the two observation sites (P<0郾 001). Compared to the rural forest site, the urban site had an average 0.93益 higher temperature, 3.37% lower humidity, and 13108.77 lx lower maximum light intensity. This shows typical differences of temperature and humidity between urban and http: / / www.ecologica.cn rural sites, and implies the representativeness and appropriateness of the selection of the two monitoring sites. At the urban site, an annual average of 19.95 nL / L in near鄄gound ozone concentration was observed, slightly less than that at the rural site (23.24 nL / L). The difference pattern of ozone concentration between the two sites varied seasonally. In autumn, winter and spring, significantly higher seasonal average ozone concentrations were observed at the rural forest site, relative to the urban site (P< 0.01). In summer, there was no difference between the two sites (P > 0.05). Relative frequencies of ozone concentrations in excess of 40 nL / L were 14. 0% and 13. 9% at the urban and rural sites, respectively. AOT40 (accumulated ozone exposure over a threshold of 40 nL / L) values at the urban and rural forest sites were 0.968伊10 h and 1郾 259 伊 10 h, respectively. There was no significant difference in AOT40 values between the two sites. Our study demonstrated that near鄄ground ozone concentration in the rural forest was generally higher than that in the urban forest. However, there was no significant difference during summer in the city of Nanjing, the season when plants grow vigorously and are susceptible to damage from near鄄ground ozone concentrations. We conclude that the disturbance of plant growth from variation of near鄄ground ozone concentrations between the urban and rural sites was negligible in the urban space鄄for鄄time substitution experiments.
环丙沙星对土壤微生物量碳和土壤微生物 群落碳代谢多样性的影响
Acta Ecologica Sinica, 2013
To evaluate the effects of ciprofloxacin (CIP) residues on the microbiological characteristics of soil, the microbial biomass carbon (MBC) and carbon鄄source metabolic functions of the soil microbial communities exposed to CIP were studied by the method of chloroform fumigation extraction and Biolog technology. The results showed that the content of MBC of groups treated with CIP (w CIP 逸 0. 1滋g / g) were significantly distinguished from that of CK, and they were decreased with the increasing concentration of CIP in soil, the content of MBC in soil exposed to 100滋g / g CIP decreased 58. 69%. Moreover, the carbon鄄source metabolic functions of the soil microbial communities exposed to CIP significantly decreased, too. Under the application of CIP, the microbial utilization rate of carbon sources, including carbohydrates,
2004
Based on the 4 synthetic cruise CT D data in t he per iod of spring and summer from June 2000 to June 2002, it is rev ealed t hat there exists intrusion phenomena of low salinit y water (L SW) in the region of stratification outside the northern Jiangsu Shoal(N JS) and nearshore around Cheng shantou Shidao (CS). T he LSW intrudes much wide and strong as long as the stratification strength and varies wit h the years. T he tongue like LSW intrudes northeastward and southw estward r espectively from N JS and CS. T he fo rmer is w ide and str ong , while the latter is r elat ively w eak. T he LSW is caused by the intrusion of the fr esh coastal w ater and has a close relationship w ith the distinguished tidal fro nt in that area.