2008年12月兩次強(qiáng)寒潮過程的等熵位渦分析

doi:10.3969/2012jms.0131

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2008年12月兩次強(qiáng)寒潮過程的等熵位渦分析
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                        10.3969/2012jms.0131
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金項(xiàng)目(41005027;40875025;40875030);氣象災(zāi)害省部共建教育部重點(diǎn)實(shí)驗(yàn)室開放課題(KLME0905)

Analysis of isentropic vorticity for two cold wave processes in Dec. 2008

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利用2008年12月的NCAR/NCEP逐日6 h再分析資料,對(duì)本月發(fā)生的兩次強(qiáng)寒潮事件(分別簡(jiǎn)稱為過程Ⅰ和過程Ⅱ)進(jìn)行了等熵面位渦分析。結(jié)果表明:(1)兩次寒潮過程的爆發(fā)時(shí)間均可用低層位渦擾動(dòng)的時(shí)間曲線的轉(zhuǎn)折點(diǎn)來確認(rèn);(2)兩次過程中在寒潮爆發(fā)時(shí),都存在明顯的高位渦值向下傳播特征,過程Ⅱ明顯于過程Ⅰ;(3)等熵面分析可跟蹤寒潮強(qiáng)冷空氣活動(dòng),等熵面位渦演變反映了高、低層冷空氣的分布及活動(dòng)狀況;等熵面位渦高值區(qū)代表冷空氣范圍,等位渦線密集區(qū)代表冷暖空氣對(duì)峙。寒潮爆發(fā)時(shí),等熵面上高層高位渦向下向南傳播,導(dǎo)致高位渦強(qiáng)冷空氣在垂直方向上拉伸,正渦度增強(qiáng)。

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NCAR/NCEP reanalysis daily data with 6 h interval is used for the diagnostic analysis of the isentropic potential vorticity for two processes(process Ⅰ and Ⅱ for short) of strong cold wave in Dec,2008. The result shows that: firstly, the time of cold wave outbreaking can be determined by the turning point of the time curve of low-level potential vorticity disturbance; secondly, there are evident features of the downward spread of high vorticity in both processes when cold wave occurs. The analysis of isentropic surface can be used to follow the track of strong cold air motion in cold waves. Also, the isentropic potential vorticity evolution represents the distribution and activities of cold air at high and low levels. The high value region of isentropic potential vorticity demonstrates the range of cold air while the concentrated region of equal constant potential vorticity lines represents confrontation of warm and cold air. When cold waves outbreak, high potential vorticity transports downward and southward at high level in isentropic surface, so strong cold air of high potential vorticity extrudes. Otherwise, the isobaric surface shows a shape with convex above and concave below, the cyclonic rotation enhances and positive vorticity increases. In process Ⅱ, cold air is supplied again, which at high level transports downward so intensely that the temperature at surface decreases rapidly.

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田秀霞,壽紹文.2008年12月兩次強(qiáng)寒潮過程的等熵位渦分析.氣象科學(xué),2013,33(1):102-108 TIAN Xiuxia, SHOU Shaowen. Analysis of isentropic vorticity for two cold wave processes in Dec. 2008. Journal of the Meteorological Sciences,2013,33(1):102-108

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收稿日期:2011-08-04
最后修改日期:2012-05-20
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在線發(fā)布日期: 2013-03-06
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