兩次春季強風暴天氣環(huán)境場對比分析

doi:10.3969/2013jms.0001

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兩次春季強風暴天氣環(huán)境場對比分析
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                        10.3969/2013jms.0001
                    
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基金項目:國家自然科學基金資助項目（41140036）

Contrast analysis on environment field of two strong storms in spring

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利用NCAR/NCEP再分析資料和常規(guī)氣象觀測資料，對發(fā)生在長江中下游的兩次春季強風暴天氣影響系統(tǒng)、不穩(wěn)定條件、觸發(fā)機制進行對比分析。結(jié)果表明：（1）兩次強風暴天氣，都是在東北冷渦大背景、高空槽、低層切變線和偏西氣流的有利形勢下產(chǎn)生的；（2）兩次強風暴過程的近地面比濕不足12 g/kg，相對濕度在600 hPa附近呈現(xiàn)低—高—低的變化，近地面的水汽通量在強對流發(fā)生地附近輻合；（3）流場分布表征：低層輻合、高層輻散；強風暴發(fā)生前后垂直速度是下沉—上升—上升運動減弱的變化；（4）風暴發(fā)生前近地層溫度梯度明顯加強；K指數(shù)>30℃、SWEAT指數(shù)>100；（5）上層干冷空氣下傳侵入引發(fā)的對流不穩(wěn)定層結(jié)、較強垂直風切變、能量鋒區(qū)的存在、高低空急流耦合所造成的抽吸作用均有利于觸發(fā)強對流天氣的產(chǎn)生；（6）兩次強風暴過程的不同點有：近地面第1次過程的濕度比第2次過程的濕度低；第1次過程的能量鋒區(qū)自下而上北抬，第2次過程南撤。

Abstract:

Based on NCAR/NCEP reanalysis and observation data, the influencing system, unstable conditions and triggerring mechanism of two strong storms in spring in the middle and lower Yangtze were analyzed. Results are as follows: (1) Both of two strong storms occurred in the conditions of upper-level trough, lower shear line and west airflow under the background of northeast cold vortex. (2) The special humidity near the ground was below 12 g/kg and relative humidity experienced a process of going down—going up—going down again at 600 hPa. Moisture flux near the ground was convergent in the area with strong convective weather. (3) The flow field distribution was convergent in low layer and divergent in high layer. The change of vertical speed before and after strong storm occurrence showed in turn sinking-rising-weakened rising. (4) The temperature gradient near the ground improved remarkably before the storms. K index was greater than 30℃ and SWEAT index was more than 100. (5) Convective unstable stratification caused by dry and cold air invasion, strong vertical wind shear, energy front area, suction action of high and low jet coupling all triggered convective weather. (6) Some differences existed in the two strong storms: humidity in the first process near the surface was lower than that in the second; the energy front area was northward lifting from bottom to top in the first process while in the second one it was southward lifting.

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周后福,鄭振榮,刁秀廣,劉杰,王華軍.兩次春季強風暴天氣環(huán)境場對比分析.氣象科學,2014,34(2):229-236 ZHOU Houfu, ZHENG Zhenrong, DIAO Xiuguang, LIU Jie, WANG Huajun. Contrast analysis on environment field of two strong storms in spring. Journal of the Meteorological Sciences,2014,34(2):229-236

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收稿日期:2012-08-13
最后修改日期:2012-10-01
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在線發(fā)布日期: 2014-05-07
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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说