| 1965-2012年甘肃平凉地区大雪天气气候特征 |
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| 引用本文： | 王丽娜,王若升,李常德.1965-2012年甘肃平凉地区大雪天气气候特征[J].冰川冻土,2014,36(6):1450-1455. |
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| 作者姓名： | 王丽娜 王若升 李常德 |
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| 作者单位： | 甘肃省平凉市气象局, 甘肃 平凉 744000 |
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| 基金项目： | 甘肃省气象局气象科研重点项目“基于区域气象站资料的甘肃乡镇精细化气温预报系统” |
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| 摘 要： | 利用甘肃平凉地区7个气象自动站1965-2012年的逐日气象整编资料, 统计出近48 a来大雪天气出现次数, 分析了平凉大雪天气的统计特征和气候变化规律, 然后用近14 a历史天气图资料对31次大雪过程进行对比分型, 总结出三类天气形势的特征. 结果表明: 1965-2012年48 a来, 平凉大雪天气出现次数总体变化趋势不显著; 大雪天气多集中出现在秋冬、冬春冷暖季节交替的时期, 冬春交替期间出现次数多于秋冬交替期间, 隆冬季节出现次数相对较少. 平凉产生大雪天气的主要天气形势有三类: 高原低槽型、西风带小槽型和阻高-横槽型, 三类形势中最多的是高原低槽型, 其他两类出现概率相差不到10个百分点.
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| 关 键 词： | 平凉 大雪 气候特征 天气形势 |
| 收稿时间： | 2014-04-07 |
| 修稿时间： | 2014-09-07 |
Study of the weather and climatic characteristics of heavy snow events in Pingliang Prefecture of Gansu Province from 1965 to 2012 |
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| WANG Lina,WANG Ruosheng,LI Changde.Study of the weather and climatic characteristics of heavy snow events in Pingliang Prefecture of Gansu Province from 1965 to 2012[J].Journal of Glaciology and Geocryology,2014,36(6):1450-1455. |
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| Authors: | WANG Lina WANG Ruosheng LI Changde |
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| Institution: | Pingliang Meteorological Bureau, Pingliang 744000, Gansu, China |
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| Abstract: | In this paper, based on the daily meteorological data from seven automatic stations in Pingliang Prefecture of Gansu Province from 1965 to 2012, the number of heavy snow events during the 48 years were calculated, and the statistical characteristics of heavy snow event, as well as climate variation were analyzed. At last, three conceptual synoptic situation were established by using comparative and contrastive analyses of historical synoptic charts of the last 14 years, which involve 31 heavy snow events. It is found that 1) there was no overall changing tendency of heavy snow frequency in Pingliang Prefecture during the 48 years; 2) heavy snow events in the municipal always concentrated in the alternant phases from autumn to winter and from winter to spring, more in the phase from winter to spring and less in the phase from autumn to winter, and rare in the mid winter; 3) there were three conceptual synoptic situation of heavy snow event, i.e., plateau low trough type, small westerly trough type and blocking high pressure-transverse trough type, of which the plateau low trough type appeared most frequently. |
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| Keywords: | Pingliang Prefecture heavy snow climatic characteristics synoptic situation |
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