Based on the monthly precipitation data of 116 meteorological stations in Shandong Province during 1970-2021,standardized precipitation index(SPI)was calculated,and the methods of linear fitting,mutation test and Morl...Based on the monthly precipitation data of 116 meteorological stations in Shandong Province during 1970-2021,standardized precipitation index(SPI)was calculated,and the methods of linear fitting,mutation test and Morlet wavelet analysis were used to analyze the change trend and temporal and spatial distribution characteristics of SPI index in the past 52 years.The results show that there were more normal years in Shandong Province,and the frequency reached 38.46%.There was severe drought in the 1980s and more wet years after 2003.SPI index showed an upward trend in spring,summer and winter but a weak arid trend in autumn.In addition,intense dry weather was more frequent in summer.Spatially,the climate was normal or humid in most areas of Shandong Province.The regions with more wet years were located in the central and northeast Shandong and the peninsula,while the climate was normal in the southwest and north of Shandong.The areas with more dry years were mainly located in the northwest of Shandong Province.There was mainly local and global drought in Shandong Province,and the arid area showed a decreasing trend.In the past 52 years,Shandong Province experienced quasi-4 times of alternation between dry and wet climate.The long period of 21 a was the first main period,and the climate would be still wet in Shandong Province in the future.In terms of mutation,the climate in Shandong Province became humid after 2003,and 2003 was the mutation point.After the abrupt change,the climate changed from gradually drying to wetting.展开更多
[ Objective] The study aimed to discuss the characteristics of atmospheric environmental pollution in Jining City. Methed] Based on the environmental monitoring data and synchronous meteorological data in 2006 -2010 ...[ Objective] The study aimed to discuss the characteristics of atmospheric environmental pollution in Jining City. Methed] Based on the environmental monitoring data and synchronous meteorological data in 2006 -2010 in Jining City, the distribution regularity of main atmospheric pol- lutants in this city was studied by the method of statistical analysis. [ Result] There were obvious spatial and temporal distribution of atmospheric pollutants in Jining City during 2006 -2010 under the comprehensive effects of meteorological conditions and pollution source emission. That is, at- mospheric pollution was serious in winter but slight in summer, and it was severe in the morning and evening. The load coefficients of SO2, NO2 and PM10 in the atmosphere showed an increasing trend from 2006 to 2010, and their concentrations had close relations with wind direction and ve- locity, urban heat island effect, and motor vehicle quantity. [ Conclusion] This research has important practical significance to the control of atmos- pheric pollution in Jining City.展开更多
基金Supported by the Special Project for the Grass-roots Units of Shandong Meteorological Bureau(2023SDJC14).
文摘Based on the monthly precipitation data of 116 meteorological stations in Shandong Province during 1970-2021,standardized precipitation index(SPI)was calculated,and the methods of linear fitting,mutation test and Morlet wavelet analysis were used to analyze the change trend and temporal and spatial distribution characteristics of SPI index in the past 52 years.The results show that there were more normal years in Shandong Province,and the frequency reached 38.46%.There was severe drought in the 1980s and more wet years after 2003.SPI index showed an upward trend in spring,summer and winter but a weak arid trend in autumn.In addition,intense dry weather was more frequent in summer.Spatially,the climate was normal or humid in most areas of Shandong Province.The regions with more wet years were located in the central and northeast Shandong and the peninsula,while the climate was normal in the southwest and north of Shandong.The areas with more dry years were mainly located in the northwest of Shandong Province.There was mainly local and global drought in Shandong Province,and the arid area showed a decreasing trend.In the past 52 years,Shandong Province experienced quasi-4 times of alternation between dry and wet climate.The long period of 21 a was the first main period,and the climate would be still wet in Shandong Province in the future.In terms of mutation,the climate in Shandong Province became humid after 2003,and 2003 was the mutation point.After the abrupt change,the climate changed from gradually drying to wetting.
文摘[ Objective] The study aimed to discuss the characteristics of atmospheric environmental pollution in Jining City. Methed] Based on the environmental monitoring data and synchronous meteorological data in 2006 -2010 in Jining City, the distribution regularity of main atmospheric pol- lutants in this city was studied by the method of statistical analysis. [ Result] There were obvious spatial and temporal distribution of atmospheric pollutants in Jining City during 2006 -2010 under the comprehensive effects of meteorological conditions and pollution source emission. That is, at- mospheric pollution was serious in winter but slight in summer, and it was severe in the morning and evening. The load coefficients of SO2, NO2 and PM10 in the atmosphere showed an increasing trend from 2006 to 2010, and their concentrations had close relations with wind direction and ve- locity, urban heat island effect, and motor vehicle quantity. [ Conclusion] This research has important practical significance to the control of atmos- pheric pollution in Jining City.
