J4 ›› 2008, Vol. 25 ›› Issue (1): 53-57.
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JING Huaixi 1,SHI Yuanyuan1,BAI Huzhi2
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景怀玺1,石圆圆1,白虎志2
作者简介:
基金资助:
白银市科学技术局“白银市地质气象灾害预报预警系统”(GK20062-3一O11A)资助
Abstract:
11he climatic variation feature of the first and tIIe last dates for thunderstorm occurring and thunderstorm days in tIIe middle part of Gansu province was analyzed by using observations of4 stations in Baiyin from 1958 to 2005 based on statistics methods of linear tend-encv estimate and wavelet analysis.Results show that the first dates of tIIunderstorm presented a delay trend(2.7 d/10 a)in the north plain:the last dates were ahead(一2.6 d/lO a)in tIIe north plain and presented parabola change in tIIe soutII mountain area.The first date variation of thunderstorm in the north plain Was steadier than that in tIIe south mountain 81"PAl,whereas tIIe last date variation of thun -derstorm in the south mountain area was steadier than that in the north plain,an d the first date change Was steadier than that of the last date of thunderstorm.Th e corresponding threshold of5一da y average temperature Was 9℃ and ll℃ in tIIe north plain for the first and last dates.respectively,and 6℃ in the south mountain.Thunderstorm days were more in tIIe soutII and less in the north,the period of8—10 vears was remarkable before the middle of the 1980s and the general trend of thunderstorm days Was decreasing.
Key words: thunderstorm weather, climatic characteristic, threshold of five—day average temperature
摘要:
利用1958—2005年白银地区4测站观测资料,采用线性趋势估计、子波分析等数理统计方法,对白银地区雷暴初、终日及雷暴出现日数气候变化特征进行分析。结果表明:雷暴初日北部平原呈推迟的趋势(2.7 d/10 a),南部山区在其平均期(4月20日)附近上下摆动。雷暴终日北部平原呈提前趋势(一2.6 d/10 a),南部山区呈抛物线变化趋势,先升后降;雷暴初日变化北部平原较南部山区稳定,雷暴终日变化南部山区较北部平原区稳定,雷暴初日较终日稳定;雷暴初、终日北部平原对应的候平均气温阈值分别为9 oC、11 oC,南部山区对应的候平均气温阈值皆为6 oC;雷暴日数“南多北少”,20世纪80年代中期以前8—10 a的周期显著,其总趋势是减少的。
关键词: 雷暴天气, 气候特征, 候平均气温阈值
CLC Number:
P467
JING Fu-Xi, DAN Yuan-Yuan, BAI Hu-Zhi. Climatic Characteristic of Thunderstorm W eather Variations in the Middle Part Of Gansu Province[J]. J4, 2008, 25(1): 53-57.
景怀玺, 石圆圆, 白虎志. 甘肃中部雷暴天气变化的气候特征分析[J]. J4, 2008, 25(1): 53-57.
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