| 横断山脉地区大气环流演变特征分析 |
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| 引用本文： | 张瑶,何耀,刘丹丹.横断山脉地区大气环流演变特征分析[J].气象研究与应用,2014,35(4):24-31. |
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| 作者姓名： | 张瑶 何耀 刘丹丹 |
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| 作者单位： | 松桃苗族自治县气象局,贵州铜仁,554100 |
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| 摘 要： | 应用Lamb-Jenkinson大气环流分型方法对横断山脉地区的8个经度×10个纬度范围内1948-2012年逐日平均的海平面气压场进行环流分型,由日平均海平面气压场算出6个环流指数（u、v、V、ξu、ξv、ξ）,并由此划分出27种不同的环流型。分型结果表明：横断山脉地区主要环流分型为E型、NE型、SE型、N型和C型,其频率分别为：21.4%、14.6%、13.7%、9.8%和9.5%;E和NE型环流频率逐渐增加,C型环流型频率逐渐减少。春季横断山脉地区主导环流比较繁琐;NE、N型为夏季的主要环流型,但E型环流在夏季的频率也相当大;秋季和冬季横断山脉地区的主导环流型都为E型和SE型。夏季主导环流型持续时间较长,冬季也是主导环流持续的时间较长,个别年份主导环流型持续时间超过了一个月,这主要与横断山脉地区复杂的地形有联系。
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| 关 键 词： | 横断山脉 大气环流型 Lamb-Jenkinson环流分型 |
Characteristic analysis of atmospheric circulation evolution in Hengduan ranges |
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| Zhang Yao,He Yao,Liu Dan-dan.Characteristic analysis of atmospheric circulation evolution in Hengduan ranges[J].Journal of Guangxi Meteorology,2014,35(4):24-31. |
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| Authors: | Zhang Yao He Yao Liu Dan-dan |
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| Institution: | ( Songtao Miao Autonomous County Meteorological Service ) |
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| Abstract: | Based on the method of Lamb-Jenkinson atmospheric circulation classification,daily average sea level pressure field from 1948 to 2012 in the Hengduan mountains region of 8 longitude x 10 latitude range was classified,and six circulation index（u,v,v,ξ_u、 ξ_v、ξ） were calculated out.On the basis of these indexes 27 different circulation types were divided into.The classification results show that the main circulation types of Hengduan ranges are E,NE,SE E,N and C type,its frequency is respectively：21.4%,14.6%,13.7%,9.8%and 9.5%;the frequency of E and NE type circulation are increasing,while C type circulation type gradually decrease.The dominant circulation is more complicated in spring;while NE,N is the dominant main circulation in the summer,and frequency E type is also quite high in summer;the dominant circulation in fall and winter is E and SE type.The duration of summer and winter dominant circulation is long and lasting time leading type circulation is over a month in some years,which is mainly caused by the complex terrain of Hengduan ranges. |
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| Keywords: | Hengduan ranges atmospheric circulation pattern Lamb-Jenkinson circulation classification |
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