关键词: 种间关联, 种间关联

Abstract: The study aims to deeply understand the influence of topography of Taihang Mountains on heavy snow, provide better forecast and service for agriculture production, therefore to adapt to the adjustment of new agricultural planting structure and reduce the influence of snow on agriculture production. The authors used NCEP global reanalysis data and observations, conducted numerical experiments of two occluded frontal snowstorms occurring over Shanxi on November 10 of 2009 and March 14 of 2010 with WRF model, and investigated the impact of topography change of Taihang Mountains on magnitude, intensity, scope and spatial structural characteristics of snowstorm. The results showed that: (1) the simulation with moderate altitude was closer to observations for the snowstorm resulting from southerly influence systems, while the impact of the simulation with increased altitude was more obvious for the snowstorm due to northerly influence systems; (2) during different stages of occluded frontal snowstorm, there was a large discrepancy in the impact of topography change on the transport of low-level moisture; (3) the simulation with suitably reduced altitude made vertical structure of high-level divergence and low-level convergence more obvious and central intensity stronger, which was beneficial for the occurrence of snowstorm; (4) regarding the snowstorm owing to southerly influence systems, the simulation with reduced altitude strengthened high-level dry intrusion and consequently led to the enhanced triggering effect.