[Objective] The research aimed to analyze the variation trend of rainfall in Xingtai area of Hebei Province in recent 48 years. [Method] According to the annual and seasonal rainfall data in Xingtai, Nangong, Shahe an...[Objective] The research aimed to analyze the variation trend of rainfall in Xingtai area of Hebei Province in recent 48 years. [Method] According to the annual and seasonal rainfall data in Xingtai, Nangong, Shahe and Neiqiu during 1963-2010, by using the interannual variation rainfall line chart, trend chart and climatic variability, the variation trend of rainfall in Xingtai area in recent 48 years was analyzed. [Result] The annual rainfall in Xingtai area during 1963-2010 presented yearly decrease trend, and the decrease velocity was 18.0 mm/10 a. The annual rainfall in Xingtai, Nangong, Shahe and Neiqiu roughly presented same trend (linear decrease). Except spring rainfall in Xingtai area in recent 48 years slightly increased, the rainfall in summer, autumn and winter all presented linear decrease trend. The decrease velocity of summer rainfall was the maximum. The decrease of summer rainfall played decisive role in rainfall decrease of the whole year. The decrease trend of winter rainfall wasn’t as significant as that of autumn rainfall. [Conclusion] The research provided theoretical basis for studying climatic variation characteristics in Xingtai area under the climatic warming background.展开更多
[Objective] The research aimed to analyze the variation trend of temperature in Xingtai area in recent 48 years.[Method] According to the yearly and monthly average temperature data during 1963-2010 in Xingtai,Nangong...[Objective] The research aimed to analyze the variation trend of temperature in Xingtai area in recent 48 years.[Method] According to the yearly and monthly average temperature data during 1963-2010 in Xingtai,Nangong,Shahe and Neiqiu,the change trend of temperature in Xingtai area in recent 48 years was analyzed by using the line chart and trend chart of interannual variation average temperature,climate variability.[Result] The variation trends of annual average temperature,annual average maximum temperature,annual average minimum temperature and average temperatures in spring,summer,autumn,winter in Xingtai area in recent 48 years all presented the roughly same characteristics,which yearly rose.It embodied the climatic characteristics of global warming.The rise of annual mean temperature was because that the minimum temperature and winter average temperature rose.The continuous warm winter played the decisive role for the rise of annual average temperature.[Conclusion] The research provided the theoretical basis for understanding the variation characteristics of climate in Xingtai area under the climate warming background.展开更多
Through the analysis of durative high-temperature weather process occurred in Xingtai area in June of 2010,and the statistics on relative humidity and 850 hPa of temperature on high temperature day in Xingtai area dur...Through the analysis of durative high-temperature weather process occurred in Xingtai area in June of 2010,and the statistics on relative humidity and 850 hPa of temperature on high temperature day in Xingtai area during 2001- 2010,it was concluded that 500 h Pa of stable warm high-pressure ridge situation and 850 hPa of strong warm air mass control were favorable circulation situations for the formation of high temperature;sinking and adiabatic warming of high-altitude air mass was an important cause of high temperature weather generation; ground humidity at 14： 00 was small,that is,the atmosphere was very dry,and it was sunny-cloudy（ high cirrus） weather,which was a necessary condition for the high temperature weather; westerly at some time was favorable condition for high temperature; 850 h Pa of temperature prediction at the station was the key.When the forecasted 850 h Pa of station temperature was 21 ℃ and above,it was reminded the forecasters in the high-temperature forecast process.展开更多
[Objective] The research aimed to analyze variation trend of sunshine hours in Xingtai area in recent 40 years.[Method] Based on yearly and seasonal total sunshine hours in Xingtai,Shahe and Neiqiu during 1971-2010,th...[Objective] The research aimed to analyze variation trend of sunshine hours in Xingtai area in recent 40 years.[Method] Based on yearly and seasonal total sunshine hours in Xingtai,Shahe and Neiqiu during 1971-2010,the change characteristics of annual and seasonal sunshine hours were analyzed by using line chart,trend chart and climatic variability.[Result] The annual sunshine hours in Xingtai,Shahe and Neiqiu during 1971-2010 all showed systemic decrease tendency.The three-station average decrease velocity was 77.7 h/10 a.The decrease in Xingtai was the most significant.The second one was Neiqiu.The total sunshine hours of three stations in spring,summer,autumn and winter all presented systemic decrease tendency.The decrease of Xingtai was the most significant.The three-station average decrease rates in spring,summer,autumn and winter were respectively 10.7,18.7,21.6 and 26.6 h/10 a.Whether the annual or seasonal total sunshine hours,the decrease of Xingtai was the most significant,reflecting urban turbidity island effect feature.In the case of three-station mean in 40 years,the total sunshine hours in winter,spring,summer and autumn were respectively 485.5,691.4,631.7 and 551.1 h.It illustrated that spring sunshine was the most enough and was followed by summer sunshine.The gas blanket in winter was stable,and the sunshine hours were the fewest.The main reason of sunshine hours decrease was urbanization development and aggravation of pollutant discharge.[Conclusion] The research provided scientific basis for reasonably using agricultural climate resources,improving ecological environment and promoting development of agricultural economy.展开更多
文摘[Objective] The research aimed to analyze the variation trend of rainfall in Xingtai area of Hebei Province in recent 48 years. [Method] According to the annual and seasonal rainfall data in Xingtai, Nangong, Shahe and Neiqiu during 1963-2010, by using the interannual variation rainfall line chart, trend chart and climatic variability, the variation trend of rainfall in Xingtai area in recent 48 years was analyzed. [Result] The annual rainfall in Xingtai area during 1963-2010 presented yearly decrease trend, and the decrease velocity was 18.0 mm/10 a. The annual rainfall in Xingtai, Nangong, Shahe and Neiqiu roughly presented same trend (linear decrease). Except spring rainfall in Xingtai area in recent 48 years slightly increased, the rainfall in summer, autumn and winter all presented linear decrease trend. The decrease velocity of summer rainfall was the maximum. The decrease of summer rainfall played decisive role in rainfall decrease of the whole year. The decrease trend of winter rainfall wasn’t as significant as that of autumn rainfall. [Conclusion] The research provided theoretical basis for studying climatic variation characteristics in Xingtai area under the climatic warming background.
文摘[Objective] The research aimed to analyze the variation trend of temperature in Xingtai area in recent 48 years.[Method] According to the yearly and monthly average temperature data during 1963-2010 in Xingtai,Nangong,Shahe and Neiqiu,the change trend of temperature in Xingtai area in recent 48 years was analyzed by using the line chart and trend chart of interannual variation average temperature,climate variability.[Result] The variation trends of annual average temperature,annual average maximum temperature,annual average minimum temperature and average temperatures in spring,summer,autumn,winter in Xingtai area in recent 48 years all presented the roughly same characteristics,which yearly rose.It embodied the climatic characteristics of global warming.The rise of annual mean temperature was because that the minimum temperature and winter average temperature rose.The continuous warm winter played the decisive role for the rise of annual average temperature.[Conclusion] The research provided the theoretical basis for understanding the variation characteristics of climate in Xingtai area under the climate warming background.
文摘Through the analysis of durative high-temperature weather process occurred in Xingtai area in June of 2010,and the statistics on relative humidity and 850 hPa of temperature on high temperature day in Xingtai area during 2001- 2010,it was concluded that 500 h Pa of stable warm high-pressure ridge situation and 850 hPa of strong warm air mass control were favorable circulation situations for the formation of high temperature;sinking and adiabatic warming of high-altitude air mass was an important cause of high temperature weather generation; ground humidity at 14： 00 was small,that is,the atmosphere was very dry,and it was sunny-cloudy（ high cirrus） weather,which was a necessary condition for the high temperature weather; westerly at some time was favorable condition for high temperature; 850 h Pa of temperature prediction at the station was the key.When the forecasted 850 h Pa of station temperature was 21 ℃ and above,it was reminded the forecasters in the high-temperature forecast process.
文摘[Objective] The research aimed to analyze variation trend of sunshine hours in Xingtai area in recent 40 years.[Method] Based on yearly and seasonal total sunshine hours in Xingtai,Shahe and Neiqiu during 1971-2010,the change characteristics of annual and seasonal sunshine hours were analyzed by using line chart,trend chart and climatic variability.[Result] The annual sunshine hours in Xingtai,Shahe and Neiqiu during 1971-2010 all showed systemic decrease tendency.The three-station average decrease velocity was 77.7 h/10 a.The decrease in Xingtai was the most significant.The second one was Neiqiu.The total sunshine hours of three stations in spring,summer,autumn and winter all presented systemic decrease tendency.The decrease of Xingtai was the most significant.The three-station average decrease rates in spring,summer,autumn and winter were respectively 10.7,18.7,21.6 and 26.6 h/10 a.Whether the annual or seasonal total sunshine hours,the decrease of Xingtai was the most significant,reflecting urban turbidity island effect feature.In the case of three-station mean in 40 years,the total sunshine hours in winter,spring,summer and autumn were respectively 485.5,691.4,631.7 and 551.1 h.It illustrated that spring sunshine was the most enough and was followed by summer sunshine.The gas blanket in winter was stable,and the sunshine hours were the fewest.The main reason of sunshine hours decrease was urbanization development and aggravation of pollutant discharge.[Conclusion] The research provided scientific basis for reasonably using agricultural climate resources,improving ecological environment and promoting development of agricultural economy.
