【摘要】 探讨蝗灾发生程度与大气环流的关系是建立蝗灾天气学预测模型的基础。本文运用统计学理论研究了内蒙古地区蝗虫发生面积与大气环流特征量的关系。结果表明:头年7月西太平洋副高脊线位置南移有利于成虫生长和产卵;当年2月北非大西洋北美副高北界偏北、当年1月太平洋区极涡偏强影响虫卵越冬和夏季生长,与当年蝗虫发生面积呈负相关;当年5月北半球极涡中心位置移至60°—90°W时,灾害等级均为3级以上。更多还原

【Abstract】 To approach the relationships between grasshopper occurrence and atmospheric circulation characteristics is the foundation for establishing synoptic forecast models of grasshopper disaster.By using the principles of statistics,this paper analyzed the relationships between grasshopper occurrences in Inner Mongolia and atmospheric circulation characteristics.The results showed that the southward shift of subtropical anticyclone ridge over the West Pacific in last July was advantageous to the growth and oviposition of grasshopper imagoes,while the northward shift of the north boundary of North America subtropical anticyclone in North Africa Atlantic in February and the stronger polar vortex intensity indices in Pacific Ocean in January had negative effects on the egg mass of grasshopper in winter and its growth in summer.The grasshopper disaster grades were above the third grade when the center of the polar vortex in the Northern Hemisphere in May was located nearby 60°-90°W.更多还原