Unbalanced development in term as industrial structure and the efficiency use of energy have aggravated environmental pollution to different degrees resulting in the increase of range, time and degree of fog-haze. Thi...Unbalanced development in term as industrial structure and the efficiency use of energy have aggravated environmental pollution to different degrees resulting in the increase of range, time and degree of fog-haze. This, in turn, forced the government to carry out supply-side reforms, to improve energy efficiency and optimize the industrial structure to weaken the environmental pollution. To tackle these problems, this work provides an index system for the issues related to fog-haze, uses a non-linear ST-SVAR model to reflect the effects of industrial structure and energy use efficiency on fog-haze. Results indicated that: First, current industrial structure and energy use efficiency have greater impact on the comprehensive equation of fog-haze risk than itself. With the passage of time, this influence is still gradually expanding. Second, the equations of industrial structure and energy use efficiency are strongly influenced by themselves, and other variables as the current period have less impact on them. Finally, the non-linear or asymmetric relationship is shown among industrial structure, energy use efficiency, and the fog-haze comprehensive risk equation.展开更多
Since China broke the blockade and opened the country to the outside world, many township enterprises develop quickly. Together with the pollution caused by China’s coal-burning as the main source of national energy,...Since China broke the blockade and opened the country to the outside world, many township enterprises develop quickly. Together with the pollution caused by China’s coal-burning as the main source of national energy, the pollution caused by small and medium-sized enterprises in towns and villages due to their small investment, low technology level and weak environmental awareness, and the pollution caused by a sharp increase in motor vehicle emissions lead to the fact that fog-haze has been rampant in China’s cities and urban agglomerations for nearly two decades, especially in the Beijing-Tianjin-Hebei region. This paper sorted out the current situation of fog-haze and analyzed the causes of fog-haze from the two aspects of natural and man-made causes, discussed the harms of fog-haze to human body, environment and life, and put forward the concrete measures to solve the fog-haze problem.展开更多
Characteristics and cause of the fog-haze event in East China in January 2013 were analyzed with the meteorological conventional observation data and atmospheric composition observation data. Results showed that fog o...Characteristics and cause of the fog-haze event in East China in January 2013 were analyzed with the meteorological conventional observation data and atmospheric composition observation data. Results showed that fog or haze days in east area of Southwest China and most areas of central east China were more than 20 days in this month, especially in east of North China, Huanghuai and Jianghuai regions,that were 10 -15 days more than in the same period of normal years. 500 hPa circulation presented zonal type, cold air wasn＇t active, south-branch trough was weaker, and precipitation amounts was small, which was the weather background of the extreme fog and haze. Northwest airflow at upper layer of East Asia mid-high latitude,less cloud,ground temperature reduction at night, and warm dry air coverd at 850 hPa that led to temperature inversion near surface layer,which was the key thermal factor of fog and haze formation. High humidity near the ground ,weak horizontal wind speed, and weak ascending motion ,which were not favorable for horizontal diffusion and vertical exchange of water vapor and pollutant but were the dynamic factors of maintaining fog and haze. Whether there was a water vapor saturated layer performance in relative humidity /〉90% below 925 hPa or not can be looked as a basis of distinguishing between fog and haze.展开更多
Hourly global solar radiation data is an important factor for solar energy utilization.Due to the lack of solar radiation observation stations in many areas,some hourly solar radiation models are proposed to predict h...Hourly global solar radiation data is an important factor for solar energy utilization.Due to the lack of solar radiation observation stations in many areas,some hourly solar radiation models are proposed to predict hourly solar radiation.However,the existing models perform poorly in heavy fog-haze areas because the weakening effect of fog-haze on solar radiation is not considered.Thus,in this paper,hourly global solar radiation prediction models are developed considering air quality index(AQI)using XGBoost algorithm.The results show a general improvement in the accuracy of models with AQI as an additional input(Model B1-B6)compared to models that do not consider AQI(Model A1-A6).Compared to Model A,Model B have an increase in R value from 0.927 to 0.948,a decrease in RMSE value from 0.300 to 0.282 and a decrease in MAPE value from 0.159 to 0.145.In addition,for hourly solar radiation prediction,the six most important inputs are the day of the year,air temperature difference,surface temperature difference,hour,AQI,and total cloud cover.展开更多
The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of sp...The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of spread mechanics and controlling strategies of influenza based on Fog-Haze will be scientifically meaningful.Considering that when the concentration of Fog-Haze is low,Fog-Haze contributes to the number of infectious individuals and Fog-Haze suppresses the transmission of the influenza virus when the concentration of Fog-Haze is high,we establish the Fog-Haze dynamics model.Then we prove the global existence and boundedness of the solution,and the global asymptotic stability of the solution is given by constructing a suitable Lyapunov functional.Under the Fog-Haze weather,we study the inffuenza virus transmission model that incorporates the incidence rate to reflect the Fog-Haze-dependent saturation effect and investigate the effect of Fog-Haze pollution on the transmission of influenza.We show that the basic reproduction number R_(0) determines the global dynamics of the system:if R_(0)<1,the disease-free equilibrium is global asymptotically stable;the unique endemic equilibrium is global asymptotically stable if R_(0)>1.Simulations are carried out to validate the theoretical results.Our study provides further understanding of the dynamics of Fog-Haze and the effect of Fog-Haze pollution on the transmission of influenza.展开更多
文摘Unbalanced development in term as industrial structure and the efficiency use of energy have aggravated environmental pollution to different degrees resulting in the increase of range, time and degree of fog-haze. This, in turn, forced the government to carry out supply-side reforms, to improve energy efficiency and optimize the industrial structure to weaken the environmental pollution. To tackle these problems, this work provides an index system for the issues related to fog-haze, uses a non-linear ST-SVAR model to reflect the effects of industrial structure and energy use efficiency on fog-haze. Results indicated that: First, current industrial structure and energy use efficiency have greater impact on the comprehensive equation of fog-haze risk than itself. With the passage of time, this influence is still gradually expanding. Second, the equations of industrial structure and energy use efficiency are strongly influenced by themselves, and other variables as the current period have less impact on them. Finally, the non-linear or asymmetric relationship is shown among industrial structure, energy use efficiency, and the fog-haze comprehensive risk equation.
文摘Since China broke the blockade and opened the country to the outside world, many township enterprises develop quickly. Together with the pollution caused by China’s coal-burning as the main source of national energy, the pollution caused by small and medium-sized enterprises in towns and villages due to their small investment, low technology level and weak environmental awareness, and the pollution caused by a sharp increase in motor vehicle emissions lead to the fact that fog-haze has been rampant in China’s cities and urban agglomerations for nearly two decades, especially in the Beijing-Tianjin-Hebei region. This paper sorted out the current situation of fog-haze and analyzed the causes of fog-haze from the two aspects of natural and man-made causes, discussed the harms of fog-haze to human body, environment and life, and put forward the concrete measures to solve the fog-haze problem.
基金Supported by Special Item of Public Welfare Industry(Meteorology) Science Research,China(GYHY201306015)National Science and Technology Support Plan Item,China(2014BAC16B02)
文摘Characteristics and cause of the fog-haze event in East China in January 2013 were analyzed with the meteorological conventional observation data and atmospheric composition observation data. Results showed that fog or haze days in east area of Southwest China and most areas of central east China were more than 20 days in this month, especially in east of North China, Huanghuai and Jianghuai regions,that were 10 -15 days more than in the same period of normal years. 500 hPa circulation presented zonal type, cold air wasn＇t active, south-branch trough was weaker, and precipitation amounts was small, which was the weather background of the extreme fog and haze. Northwest airflow at upper layer of East Asia mid-high latitude,less cloud,ground temperature reduction at night, and warm dry air coverd at 850 hPa that led to temperature inversion near surface layer,which was the key thermal factor of fog and haze formation. High humidity near the ground ,weak horizontal wind speed, and weak ascending motion ,which were not favorable for horizontal diffusion and vertical exchange of water vapor and pollutant but were the dynamic factors of maintaining fog and haze. Whether there was a water vapor saturated layer performance in relative humidity /〉90% below 925 hPa or not can be looked as a basis of distinguishing between fog and haze.
基金the funding support from China Postdoctoral Science Foundation(No.2023M730981)the data sup-port from the Ministry of Ecology and Environment of the People’s Re-public of China and National Meteorological Science Data Center.
文摘Hourly global solar radiation data is an important factor for solar energy utilization.Due to the lack of solar radiation observation stations in many areas,some hourly solar radiation models are proposed to predict hourly solar radiation.However,the existing models perform poorly in heavy fog-haze areas because the weakening effect of fog-haze on solar radiation is not considered.Thus,in this paper,hourly global solar radiation prediction models are developed considering air quality index(AQI)using XGBoost algorithm.The results show a general improvement in the accuracy of models with AQI as an additional input(Model B1-B6)compared to models that do not consider AQI(Model A1-A6).Compared to Model A,Model B have an increase in R value from 0.927 to 0.948,a decrease in RMSE value from 0.300 to 0.282 and a decrease in MAPE value from 0.159 to 0.145.In addition,for hourly solar radiation prediction,the six most important inputs are the day of the year,air temperature difference,surface temperature difference,hour,AQI,and total cloud cover.
基金supported by the National Natural Science Foundation of China (12171291,11601291,61873154)the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (20200001)+5 种基金the Fundamental Research Program of Shanxi Province (20210302124018)the Shanxi Scholarship Council of China (HGKY2019004)the Scientific and Technological Innovation Programs (STIP)of Higher Education Institutions in Shanxi (2019L0082)the Program for the Outstanding Innovative Teams (OIT)of Higher Learning Institutions of Shanxithe Simons Foundation-Mathematics and Physical Sciences (523360)the 1331 Engineering Project of Shanxi Province.
文摘The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of spread mechanics and controlling strategies of influenza based on Fog-Haze will be scientifically meaningful.Considering that when the concentration of Fog-Haze is low,Fog-Haze contributes to the number of infectious individuals and Fog-Haze suppresses the transmission of the influenza virus when the concentration of Fog-Haze is high,we establish the Fog-Haze dynamics model.Then we prove the global existence and boundedness of the solution,and the global asymptotic stability of the solution is given by constructing a suitable Lyapunov functional.Under the Fog-Haze weather,we study the inffuenza virus transmission model that incorporates the incidence rate to reflect the Fog-Haze-dependent saturation effect and investigate the effect of Fog-Haze pollution on the transmission of influenza.We show that the basic reproduction number R_(0) determines the global dynamics of the system:if R_(0)<1,the disease-free equilibrium is global asymptotically stable;the unique endemic equilibrium is global asymptotically stable if R_(0)>1.Simulations are carried out to validate the theoretical results.Our study provides further understanding of the dynamics of Fog-Haze and the effect of Fog-Haze pollution on the transmission of influenza.
