| 摘要: |
| 【目的】掌握大兴安岭地区雷电分布的特点，以提高当地森林火险等级的预报水平。【方法】利用黑龙江省大兴安岭地区的闪电定位仪数据及雷击火和气象数据，分析2005-2008年闪电分布特征及其与雷击火的关系。【结果】大兴安岭地区闪电主要发生在6-8月份，日变化基本呈双峰分布，其中12：00-20:00发生最频繁；研究区负闪次数明显多于正闪，6月和8月以雷电流强度绝对值在1～10 kA的闪击次数居多，7月以雷电流强度绝对值大于10 kA的闪击次数占优势，其中从10:00-20:00，雷电流强度绝对值多为1～10 kA，从21:00-03:00，雷电流强度绝对值在20 kA以上所占比例高；闪击当日的降水量对雷击火的发生有较大影响，闪击次数为［1，1 000］∪［10 500，+∞），且当日降水量为［0，1］ mm易发生雷击火；发生雷击火的雷电流强度绝对值主要在1~10 kA。【结论】 闪电和降水对大兴安岭地区的雷击火发生均有较大影响，在较少降水及中等强度雷电流时更易发生雷击火。 |
| 关键词: 大兴安岭 雷电 雷击火 |
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| 基金项目:中国气象局公益性行业(气象)科研专项（GYHY200706021） |
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| Study on the lightning conditions of lightning fires in Daxing’an mountains |
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| Abstract: |
| 【Objective】This study was to master the local distribution characteristics of lightning to raise forecast standards further.【Method】Based on the data on lightning position indicator,and lightning fire and meteorology from 2005 to 2008,the relationship between the lightning distributivity and lightning fire in Daxing’an mountains was analyzed.【Result】Lightning occurred frequently from June to August with bimodal daily variation,most frequently from 12:00 to 20:00.The proportion of negative lightning was higher than that of positive one.Absolute value of intensity of lightning current between 1 kA and 10 kA mostly occurred in June and August,while that larger than 10 kA mostly occurred in July.At the same time,it was mostly between 1 kA and 10 kA at 10:00 and 20:00,and from 21:00-03:00,it was mostly above 20 kA.On the same day of lightning, precipitation has great influence on fires.The lightning time was ［1，1 000］ and ［10 500，+∞),and fires occurred easily when the precipitation was ［0，1］ mm.Absolute value of intensity of lightning current was mostly between 1 kA and 10 kA.【Conclusion】Lightning current and precipitation have great influence on lighting fire in Daxing’an mountains.Lighting fires were liable when precipitation was low and intensity of lightning current was moderate. |
| Key words: Daxing’an mountains lightning lightning fires |
