[Objective] The research aimed to analyze a regional rainstorm weather process in north-central Henan Province. [Method] Based on the conventional meteorological observation data and the rainfall data of Henan Meteoro...[Objective] The research aimed to analyze a regional rainstorm weather process in north-central Henan Province. [Method] Based on the conventional meteorological observation data and the rainfall data of Henan Meteorological Station, the diagnostic analysis of atmospheric thermodynamics and dynamics on a rainstorm weather process in north-central Henan Province on July 19, 2010 was carried out. The characteristics of physical quantity field and the evolution of weather situation in north-central Henan Province when the rainstorm happened were studied. [Result] Western Pacific subtropical high strengthened to extend westward. The dynamic uplifting of low vortex at the middle and low layers, the strong water vapor transportation of southwest low-level jet caused the regional rainstorm weather process in north-central Henan Province. The diagnostic results of physical quantity showed that the deep, thick wet layer and the sustained water vapor convergence provided the abundant water vapor for rainstorm generation. The positive vorticity advection center developed and spread from northwest to southeast, which was favorable for the development of vertical movement. The structure maintenance of positive vorticity at the middle and low layers, negative vorticity at the middle and high levels provided the power condition for the regional rainstorm generation. The pumping effect of convergence at the middle and low layers, divergence at the high layer was favorable for the strengthening of vertical ascending motion at the low layer. The uplifting effect of dew point front at the middle and low layers triggered the release of unstable energy. The confrontation of warm and cold air was one of the important reasons for the regional rainstorm. TBB characteristic analysis showed that TBB was from -60 to -50 ℃ in north-central Henan Province in the whole strong precipitation time, and the moving speed was equivalent to that of southwest vortex. The low-value belt of TBB corresponded with the rainstorm occurrence zone in Henan, and the minimum-value center of TBB was basically consistent with the strongest center of precipitation. [Conclusion] The research provided the scientific basis for the short-term forecast of rainstorm.展开更多
[ Objective] The research aimed to study influences of meteorological factors on high-quality summer millet production in north Henan Province. [ Method] By using summer millet yield and corresponding meteorological d...[ Objective] The research aimed to study influences of meteorological factors on high-quality summer millet production in north Henan Province. [ Method] By using summer millet yield and corresponding meteorological data in Anyang of Henan, influence of rainfall on yield of new high-quality summer millet vadety during 2003 -2012 was analyzed. [Result]Rainfall during May -July had the maximum influence on summer millet yield. Correlation regression equation was Y = 0.738 8X ＋ 159.991 （ R = 0.982 04）, reaching extremely significant level. [ Conclusion ] The re- search could provide scientific basis for sufficiently using local meteorological condition, breeding high-quality summer millet variety and its high yield.展开更多
[Objective] The research aimed to analyze a regional heavy rainstorm process in North Henan.[Method] Based on routine weather chart,rainfall station in county and town,satellite cloud chart,etc.,by using synoptic diag...[Objective] The research aimed to analyze a regional heavy rainstorm process in North Henan.[Method] Based on routine weather chart,rainfall station in county and town,satellite cloud chart,etc.,by using synoptic diagnostic method,formation reason of the regional heavy rainstorm weather in North Henan during 18-19 August,2010 was analyzed initially from large-scale circulation background,influence system,physical quantity field and terrain influence.[Result] The strong precipitation had obvious meso-scale characteristics.The main influence systems were ground meso-scale convergence line,shear line at the middle and low layers,low-level southwest jet.The low-level southwest jet transported sufficient water vapor for generation of the heavy rainstorm.The ground converge line increased convergence ascending movement and water vapor convergence.Atmospheric divergence convergence center at the low layer was just in North Henan.Strong rise zone of the vertical velocity was also in North Henan.It provided sufficient dynamic condition for rainstorm generation.Generation,development and movement of the ground meso-scale convergence line had good indications for occurrence times and falling zones of the rainstorm and short-time strong precipitation.The big-value zones of K index and θse at the low layer both presented Ω distribution at the vertical direction,which had indicative significance for strong precipitation forecast.The strong precipitation center corresponded with fork horn terrain,and orographic rain characteristics were obvious.[Conclusion] The research provided reference basis for forecast of this kind of rainstorm.展开更多
文摘[Objective] The research aimed to analyze a regional rainstorm weather process in north-central Henan Province. [Method] Based on the conventional meteorological observation data and the rainfall data of Henan Meteorological Station, the diagnostic analysis of atmospheric thermodynamics and dynamics on a rainstorm weather process in north-central Henan Province on July 19, 2010 was carried out. The characteristics of physical quantity field and the evolution of weather situation in north-central Henan Province when the rainstorm happened were studied. [Result] Western Pacific subtropical high strengthened to extend westward. The dynamic uplifting of low vortex at the middle and low layers, the strong water vapor transportation of southwest low-level jet caused the regional rainstorm weather process in north-central Henan Province. The diagnostic results of physical quantity showed that the deep, thick wet layer and the sustained water vapor convergence provided the abundant water vapor for rainstorm generation. The positive vorticity advection center developed and spread from northwest to southeast, which was favorable for the development of vertical movement. The structure maintenance of positive vorticity at the middle and low layers, negative vorticity at the middle and high levels provided the power condition for the regional rainstorm generation. The pumping effect of convergence at the middle and low layers, divergence at the high layer was favorable for the strengthening of vertical ascending motion at the low layer. The uplifting effect of dew point front at the middle and low layers triggered the release of unstable energy. The confrontation of warm and cold air was one of the important reasons for the regional rainstorm. TBB characteristic analysis showed that TBB was from -60 to -50 ℃ in north-central Henan Province in the whole strong precipitation time, and the moving speed was equivalent to that of southwest vortex. The low-value belt of TBB corresponded with the rainstorm occurrence zone in Henan, and the minimum-value center of TBB was basically consistent with the strongest center of precipitation. [Conclusion] The research provided the scientific basis for the short-term forecast of rainstorm.
基金Supported by"11th Five-year National Science and Technology Support Plan Project,China(2006BAD02B02-01-02)Technology System Project of National Modern Millet Industry,China(CRS-07)
文摘[ Objective] The research aimed to study influences of meteorological factors on high-quality summer millet production in north Henan Province. [ Method] By using summer millet yield and corresponding meteorological data in Anyang of Henan, influence of rainfall on yield of new high-quality summer millet vadety during 2003 -2012 was analyzed. [Result]Rainfall during May -July had the maximum influence on summer millet yield. Correlation regression equation was Y = 0.738 8X ＋ 159.991 （ R = 0.982 04）, reaching extremely significant level. [ Conclusion ] The re- search could provide scientific basis for sufficiently using local meteorological condition, breeding high-quality summer millet variety and its high yield.
文摘[Objective] The research aimed to analyze a regional heavy rainstorm process in North Henan.[Method] Based on routine weather chart,rainfall station in county and town,satellite cloud chart,etc.,by using synoptic diagnostic method,formation reason of the regional heavy rainstorm weather in North Henan during 18-19 August,2010 was analyzed initially from large-scale circulation background,influence system,physical quantity field and terrain influence.[Result] The strong precipitation had obvious meso-scale characteristics.The main influence systems were ground meso-scale convergence line,shear line at the middle and low layers,low-level southwest jet.The low-level southwest jet transported sufficient water vapor for generation of the heavy rainstorm.The ground converge line increased convergence ascending movement and water vapor convergence.Atmospheric divergence convergence center at the low layer was just in North Henan.Strong rise zone of the vertical velocity was also in North Henan.It provided sufficient dynamic condition for rainstorm generation.Generation,development and movement of the ground meso-scale convergence line had good indications for occurrence times and falling zones of the rainstorm and short-time strong precipitation.The big-value zones of K index and θse at the low layer both presented Ω distribution at the vertical direction,which had indicative significance for strong precipitation forecast.The strong precipitation center corresponded with fork horn terrain,and orographic rain characteristics were obvious.[Conclusion] The research provided reference basis for forecast of this kind of rainstorm.
