According to the information service of agricultural meteorology,based on the real-time variation information of soil moisture condition in recent three years and regular soil moisture measurement data,the meteorologi...According to the information service of agricultural meteorology,based on the real-time variation information of soil moisture condition in recent three years and regular soil moisture measurement data,the meteorological factors highly-related with the variations of soil moisture were analyzed. The result shows that the variations of soil moisture condition could be quantitatively estimated by normal meteorological observation and used for predicting the tendency and degree of spring-drought.展开更多
[Objective] The research aimed to examine climate change characteristics in western Qinling during 1967-2007. [Me^od] Based on the data of temperature, precipitation, sunshine duration, relative humidity and evaporati...[Objective] The research aimed to examine climate change characteristics in western Qinling during 1967-2007. [Me^od] Based on the data of temperature, precipitation, sunshine duration, relative humidity and evaporation capacity derived from 17 weather stations, we analyzed the climatic change characteristics in western Qinling in the past 41 years, r Result] Increase magnitude of the annual mean temperature was 0.30 ℃/10 a in the past 41 years. Annual precipitation averaged 802 mm and varied non-significantly during the 41 years, while precipitation in spring significantly decreased by 13.68 mm/10 a. Besides, annual sunshine duration and annual mean relative humidity both decreased non-significantly, in contrast to annual evaporation capacity which showed an insignificantly increasing trend. Compared among southern, central and northern areas of the western Qinling, annual mean temperature, precipitation and relative humidity showed decreasing trends from south to north, while annual sunshine duration and annual evaporation capacity showed inversely increasing trends. [ Condusionl Thus, our research could provide reference basis for ecosystem stability and related research in western Qinling.展开更多
[Objective] The characteristics of the changes of evaporation in Nanjing City from 1985 to 2010 were expounded.[Method] By dint of the evaporation data of the E601B evaporator of Nanjing during 1985-2010,an investigat...[Objective] The characteristics of the changes of evaporation in Nanjing City from 1985 to 2010 were expounded.[Method] By dint of the evaporation data of the E601B evaporator of Nanjing during 1985-2010,an investigation was performed to analyze the variation characteristics of Nanjing evaporation and the reasons based on linear regression,tendency analysis and anomaly analysis methods.[Result] Results showed that the annual and seasonal evaporation in Nanjing was increasing,especially the evaporation in spring,and followed by that in summer and autumn.The increasing evaporation tendency was indistinct in winter.And the annual evaporation variation was mainly caused by the changes of seasonal evaporation in spring and summer.The influential factors of evaporation variation included temperature,ground temperature,sunshine time,average wind speed,relative humidity,air pressure,precipitation,and so on.By means of the correlation analysis on the impact factors and evaporation,the evaporation was in positive relation with relevant humidity,temperature,and pressure and ground temperature.It had small relation with precipitation,sunshine hours and wind speed.Evaporation was the comprehensive effect of all kinds of meteorological elements.The relevance between evaporation and relevant humidity was the best.[Conclusion] The study provided theoretical basis for the analysis of water resources evaluation and climate changes.展开更多
文摘According to the information service of agricultural meteorology,based on the real-time variation information of soil moisture condition in recent three years and regular soil moisture measurement data,the meteorological factors highly-related with the variations of soil moisture were analyzed. The result shows that the variations of soil moisture condition could be quantitatively estimated by normal meteorological observation and used for predicting the tendency and degree of spring-drought.
基金Supported by Special Item of Basic Science Research Business in Central-level Public Research Institutes,China(2009KYYW12,2007KYYW04)
文摘[Objective] The research aimed to examine climate change characteristics in western Qinling during 1967-2007. [Me^od] Based on the data of temperature, precipitation, sunshine duration, relative humidity and evaporation capacity derived from 17 weather stations, we analyzed the climatic change characteristics in western Qinling in the past 41 years, r Result] Increase magnitude of the annual mean temperature was 0.30 ℃/10 a in the past 41 years. Annual precipitation averaged 802 mm and varied non-significantly during the 41 years, while precipitation in spring significantly decreased by 13.68 mm/10 a. Besides, annual sunshine duration and annual mean relative humidity both decreased non-significantly, in contrast to annual evaporation capacity which showed an insignificantly increasing trend. Compared among southern, central and northern areas of the western Qinling, annual mean temperature, precipitation and relative humidity showed decreasing trends from south to north, while annual sunshine duration and annual evaporation capacity showed inversely increasing trends. [ Condusionl Thus, our research could provide reference basis for ecosystem stability and related research in western Qinling.
基金Supported by Science and Technology Development Program of Nanjing Meteorological Bureau (NJ200809)
文摘[Objective] The characteristics of the changes of evaporation in Nanjing City from 1985 to 2010 were expounded.[Method] By dint of the evaporation data of the E601B evaporator of Nanjing during 1985-2010,an investigation was performed to analyze the variation characteristics of Nanjing evaporation and the reasons based on linear regression,tendency analysis and anomaly analysis methods.[Result] Results showed that the annual and seasonal evaporation in Nanjing was increasing,especially the evaporation in spring,and followed by that in summer and autumn.The increasing evaporation tendency was indistinct in winter.And the annual evaporation variation was mainly caused by the changes of seasonal evaporation in spring and summer.The influential factors of evaporation variation included temperature,ground temperature,sunshine time,average wind speed,relative humidity,air pressure,precipitation,and so on.By means of the correlation analysis on the impact factors and evaporation,the evaporation was in positive relation with relevant humidity,temperature,and pressure and ground temperature.It had small relation with precipitation,sunshine hours and wind speed.Evaporation was the comprehensive effect of all kinds of meteorological elements.The relevance between evaporation and relevant humidity was the best.[Conclusion] The study provided theoretical basis for the analysis of water resources evaluation and climate changes.
