| 2008年初乐山持续阴冷雨雪天气特征分析 |
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| 引用本文： | 韩健.2008年初乐山持续阴冷雨雪天气特征分析[J].高原山地气象研究,2009,29(3):73-77. |
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| 作者姓名： | 韩健 |
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| 作者单位： | 四川省信息工程学校, 成都 610072 |
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| 摘 要： | 2008年1月12日~2月13日,乐山市出现了持续低温、阴雨(雪)冰冻天气。期间,日平均气温低于3℃的连续日数、连续降雪日数都突破了自1951年以来的历史记录。此文分析了2008年灾害性天气、气候事件的环流特点,与历史上几次类似的过程(1977、1984、1996年)进行了比较,并讨论了可能成因。结果表明:极涡偏南、巴尔喀什湖到贝加尔湖维持横槽、蒙古冷高压长时间维持、西太平洋副热带高压持续偏强、以及南支槽活跃等是2008年个例期间环流的基本特点。相比较,尽管2008年与1977、1984、1996年等有相似之处,但副高明显偏强、南支槽活动旺盛、极涡明显南移是2008年的明显特点。最后,分析讨论认为:2007年8月开始的拉尼娜事件,及2007年发生的太阳黑子相对数异常偏低,二者可能对寒冷事件的形成有着重要作用。
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| 关 键 词： | 2008年低温雨雪 西北太平洋副热带高压 极涡 南支槽 蒙古冷高压 拉尼娜 |
| 收稿时间： | 2009-05-04 |
Analysis on the Persistent Snowstorm and Freezing Events in Leshan in 2008 Early |
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| HAN Jian.Analysis on the Persistent Snowstorm and Freezing Events in Leshan in 2008 Early[J].Plateau and Mountain Meteorology Research,2009,29(3):73-77. |
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| Authors: | HAN Jian |
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| Institution: | Sichuan Information and Technology School, Chengdu, 610072 |
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| Abstract: | Several rainfall and snowfall synoptic processes occurred subsequently in Leshan in January-February, 2008.During the process the number of days with average temperature below 3℃ and the number of persistence snowfall days, both broke the historical records since 1951.This article analyzes the circulation features of the disaster weather and climate events in 2008, and compared the process with similar ones in the history (1977, 1984 and 1996). The results suggest that both 2008 case and the historical cases share the following circulation features:a southward shifted polar vortex (PV), a east-west orientated trough spanning Lake Balkhash and Lake Baikal, a long-term persistent Mongolian Cold high, an enhanced west Pacific subtropical high (WPSH), and an active southern Tibetan Plateau trough (STPT).In comparison, the intensified NWSH, the active STPT, and the southward shifted PV are most significant in 2008.At last, we consider that both the La Nina event beginning from August 2007 and the lower solar activity in 2007 play a role in forming these rainfall or snowfall processes through the analysis and discussion. |
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