Environmental Science and Pollution Research - The geographical distribution of plant resources is of great significance for studying the origin, distribution, and evolution of species. Climate and... 相似文献
• The Large scale Urban Consumption of energY model was updated and coupled with WRF.• Anthropogenic heat emissions altered the precipitation and its spatial distribution.• A reasonable AHE scheme could improve the performance of simulated PM2.5.• AHE aggravated the O3 pollution in urban areas. Anthropogenic heat emissions (AHE) play an important role in modulating the atmospheric thermodynamic and kinetic properties within the urban planetary boundary layer, particularly in densely populated megacities like Beijing. In this study, we estimate the AHE by using a Large-scale Urban Consumption of energY (LUCY) model and further couple LUCY with a high-resolution regional chemical transport model to evaluate the impact of AHE on atmospheric environment in Beijing. In areas with high AHE, the 2-m temperature (T2) increased to varying degrees and showed distinct diurnal and seasonal variations with maxima in night and winter. The increase in 10-m wind speed (WS10) and planetary boundary layer height (PBLH) exhibited slight diurnal variations but showed significant seasonal variations. Further, the systematic continuous precipitation increased by 2.1 mm due to the increase in PBLH and water vapor in upper air. In contrast, the precipitation in local thermal convective showers increased little because of the limited water vapor. Meanwhile, the PM2.5 reduced in areas with high AHE because of the increase in WS10 and PBLH and continued to reduce as the pollution levels increased. In contrast, in areas where prevailing wind direction was opposite to that of thermal circulation caused by AHE, the WS10 reduced, leading to increased PM2.5. The changes of PM2.5 illustrated that a reasonable AHE scheme might be an effective means to improve the performance of PM2.5 simulation. Besides, high AHE aggravated the O3 pollution in urban areas due to the reduction in NOx. 相似文献
Environmental Science and Pollution Research - Predicting the flocculant dosage in the drinking water treatment process is essential for public health. However, due to the complexity of water... 相似文献
Environmental Science and Pollution Research - Herein, novel composite materials were prepared by intercalating functional pillars, i.e., pentafluorobenzene (PFB) and sodium... 相似文献
The global spread of COVID-19, international trade protectionism, geopolitical conflicts, and climate change presents challenges and risks to sustainable supply chains (SSCs). In recent years, scholarly interest in sustainable supply chain risk management (SSCRM) has continued to rise. A helpful literature review is necessary to enable supply chain practitioners to apply empirical findings from academic research or conceptual frameworks to their operations to maintain the stability and competitiveness of sustainable supply chains. The knowledge map of SSCRM is explored in this study using both quantitative and qualitative analysis. A total of 793 articles were retrieved to reveal the knowledge map of SSCRM. Scientometric and context analysis are combined in quantitative analysis to identify the intellectual structure of risk management research related to SSC. Then, a critical review is conducted in qualitative analysis to summarize and analyze the motivations, strategies, approaches, and tools of SSCRM. Combining the quantitative and qualitative analysis results, a conceptual model is constructed for SSCRM from three aspects: (1) risk identification, (2) risk assessment, and (3) risk mitigating and responding. Finally, future research directions are suggested based on the conceptual model for guiding the theories and practice of SSCRM. This study can work as a roadmap for providing appropriate risk management policies and toolkits to SSC, which could advance theoretical thinking on how to mitigate SSC risks.
To examine the influence of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) emissions from a municipal solid waste incinerator (MSWI) on the environment, we measured the levels of PCDD/Fs in ambient air and soil samples collected near a MSWI in Bucheon, Korea. The PCDD/Fs concentrations in the ambient air samples ranged from 0.22 to 1.16 pg I-TEQm(-3) (13.39-75.16 pg m(-3)), with an average of 0.66 pg I-TEQ m(-3) (35.62 pg m(-3)). The soil samples contained between 1.25 and 74.98 pg I-TEQ g(-1) (38.15-3,303.33 pg g(-1)), with an average of 19.06 pg I-TEQ g(-1) (1,077.11 pg g(-1)). These levels were higher than those previously reported by other investigators in a number of surveys. The furan homologues predominated in the air samples and some soil samples, and the soil PCDD/Fs levels decreased with increasing distance from the MSWI. Comparison of the homologue patterns and a multivariate statistical analysis showed that PCDD/Fs emission from the MSWI directly affected the pattern of PCDD/Fs in air, while the PCDD/Fs patterns in soil differed according to the location relative to the MSWI, roads, and construction sites. These results collectively indicate that the MSWI was the major PCDD/Fs emission source in this area, but that unidentified combustion sources and vehicles might influence the environment to some extent. 相似文献
As a part of a study developing a biological reactive barrier system to treat nitrate-contaminated groundwater, the effects of reactive media composition and co-contaminants on sulfur-oxidizing autotrophic denitrification were investigated. The size of sulfur granules affected the denitrification rates; kinetic constants of 2.883, 2.949, and 0.677 mg-N(1/2)/L(1/2)/day were obtained when the granule sizes were below 2 mm, between 2 and 5 mm, and over 5 mm, respectively. When the volume ratios of sulfur to limestone were 1:1, 2:1, 3:1, and 4:1, kinetic constants of 5.490, 3.903, 4.072, and 2.984 mg-N(1/2)/L(1/2)/day were obtained, respectively. The presence of TCE up to 20 mg/L didn't significantly affect nitrate removal efficiency. At the TCE concentration of 80 mg/L, however, nitrate removal was markedly inhibited. Also, Zn and Cu inhibited the denitrification activity at more than 0.5 mg/L of concentration whereas Cr (VI) did not significantly affect the nitrate removal efficiency at all levels tested. 相似文献
Background, Aims and Scope This research attempted to identify the dominant factors simultaneously affecting the airborne concentrations of five air
pollutants with principal component analysis and to determine the meteorologically related parameters that cause severe air-pollution
events. According to the definition of subPSI and PSI values through the U.S. EPA, the historical raw data of five criteria
air pollutants, SO2, CO, O3, PM10 and NO2, were calculated as daily subPSI values. In addition to the airborne concentrations,
this study simultaneous collected the surface meteorological parameters of the Taipei meteorological station, established
by the Central Weather Bureau.
Methods Principal component analysis was conducted to screen severe air pollution scenarios for five air pollutants: SO2, CO, O3,
PM10 and NO2. The concentrations of various air pollutants measured at 17 air-quality stations in northern Taiwan from 1995
to 2001 were transformed into daily subPSI values. The correlation analysis of the five air pollutants and four meteorological
parameters (wind speed, temperature, mixing height and ventilation rate) were included in this research. After screening severe
air pollution scenarios, this study recognized the synoptic patterns easily causing the severe air-pollution events.
Results and Discussion Analytical results showed that the eigenvalues of the first two principal components for SO2, CO, O3, PM10 and NO2 were greater
than 1. The first component of five air pollutants explained 64, 64, 67, 76 and 63% of subPSI variance for SO2, CO, O3, PM10
and NO2, respectively. Only the correlation coefficient of NO2 and CO had statistically significant positive values (0.82);
other pollutant pairs presented medium (0.4 to 0.7) or low (0 to 0.4) positive values. The correlation coefficients for air
pollutants and three meteorological parameters (wind speed, mixing height and ventilation index) were medium or low negative
values. In northern Taiwan, spring was most likely induced high concentrations and the component scores of the first component
for SO2, CO, PM10 and NO2; summer was the worst season that caused high O3 episodes. Consequently, the analytical results
of factor loadings for the first principal component and emission inventory of various sources revealed that mobile sources
were dominant factors affecting ambient air quality in northern Taiwan.
Conclusion According to the results of principal component analysis for the five air pollutants, the first two of 17 components were
cited as major factors and explained 71% of subPSI variance. Based on the inventory of NOx emissions and the isopleth diagram
of factor loading for the first component, mobile sources in the southwest Taipei City accounted for the highest factor loading
values and emission inventory values. Synoptic analysis and principal component analysis demonstrated that three types of
weather patterns (high-pressure recirculation, prefrontal warm sector and the southwesterly wind system) easily caused the
severe air-pollution scenarios. In summary, if severe air-pollution days occurred, the average meteorological parameters experienced
adverse conditions for diffusing air pollutants; that is, the average values of wind speed, mixing height and ventilation
index were lower than 2.1 ms-1, 360 m and 800 m2s-1, respectively. If one of the three synoptic patterns were to occur in
combination with adverse meteorological conditions, severe air-pollution events would be developed.
Recommendation and Outlook By utilizing synoptic patterns, this work found three weather systems easily caused severe air-pollution events over northern
Taiwan. Analytical results showed, respectively, the wind speed and mixing height were less than 2.1 m/s and 360 m during
severe air-pollution events. 相似文献