内蒙古“5.3”强沙尘暴天气成因分析
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摘要
为了研究内蒙古中西部强沙尘暴发生发展机制,利用常规气象资料及NCEP1°×1°再分析资料,对2017年5月3—4日内蒙古中西部地区一次强沙尘暴天气成因进行分析。结果表明:(1)500 hPa低槽、蒙古气旋和地面冷锋是本次强沙尘暴天气过程的主要影响系统,此次强沙暴过程属于地面冷锋和蒙古气旋共同影响的类型;(2)分析高低层温压场与涡度平流发现,动力因子(涡度平流)和热力因子(温度平流)的共同作用,推动了蒙古气旋的东移发展;(3)垂直螺旋度分布特征是上负下正,表明沙尘区域上空高层为辐散区,有下沉运动,中低层为辐合区,有上升运动。
The aims are to study the occurrence and development mechanism of strong sandstorm in midwestern Inner Mongolia. Based on conventional observation data and NCEP(1°×1°) reanalysis data, the author analyzed the causes of the strong sandstorm process in middle-western Inner Mongolia on May 3-4, 2017. The results showed that:(1) the 500 hPa trough, the Mongolia cyclone and the surface cold front were the main influencing system of the strong sandstorm process which belonged to the common type affected by the surface cold front and the Mongolia cyclone;(2) by analyzing the field of temperature-pressure and vorticity advection,dynamic factor(vorticity advection) and thermal factor(temperature advection) played a significant role in the eastward movement of the Mongolia cyclone;(3) the vertical helicity distribution was characterized by negative at higher levels and positive at lower levels, indicating that the upper and higher layers of the dust region were divergent areas with sinking motion; the middle and low layers were convergence areas with rising motion.
The aims are to study the occurrence and development mechanism of strong sandstorm in midwestern Inner Mongolia. Based on conventional observation data and NCEP(1°×1°) reanalysis data, the author analyzed the causes of the strong sandstorm process in middle-western Inner Mongolia on May 3-4, 2017. The results showed that:(1) the 500 hPa trough, the Mongolia cyclone and the surface cold front were the main influencing system of the strong sandstorm process which belonged to the common type affected by the surface cold front and the Mongolia cyclone;(2) by analyzing the field of temperature-pressure and vorticity advection,dynamic factor(vorticity advection) and thermal factor(temperature advection) played a significant role in the eastward movement of the Mongolia cyclone;(3) the vertical helicity distribution was characterized by negative at higher levels and positive at lower levels, indicating that the upper and higher layers of the dust region were divergent areas with sinking motion; the middle and low layers were convergence areas with rising motion.
引文
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[17]许东蓓,任余龙,李文莉,等.“4.29”中国西北强沙尘暴数值模拟及螺旋度分析[J].高原气象,2011,30(1):115-124.
[18]陆慧娟,高守亭.螺旋度及螺旋度方程的讨论[J].气象学报,2003,23(6):684-691.
[19]程鹏,王宝鉴,孔祥伟,等.河西走廊一次强沙尘暴天气的螺旋度诊断[J].干旱气象,2013,31(1):144-149.
[20]王文,隆霄,李耀辉,等.“2002.3”强沙尘暴过程的中尺度动力学诊断分析[J].干旱气象,2004,22(3):17-21.
[2]王丽娟,王俊超,叶金桃,等.北方一次强沙尘暴过程的诊断分析和数值模拟.高原气象[J].2013,32(4):1010-1018.
[3]马素艳,丁治英,韩经纬,等.2011年5月11日内蒙古地区强沙尘暴天气过程分析[J].内蒙古气象,2013,204(1):8-15.
[4]李岩英,许东蓓,陈英,等.典型槽型转脊型黑风天气过程成因分析[J].中国沙漠,2013,32(1):188-194.
[5]赵明瑞,闫大同,李岩瑛,等.甘肃民勤2001—2010年沙尘暴变化特征及原因分析[J].中国沙漠,2013,33(40):1144-1149.
[6]段海霞,李耀辉,蒲朝霞,等.高空急流对一次沙尘暴过程沙尘传输的影响[J].中国沙漠,2013,33(5):1461-1472.
[7]于海跃,李红英,张玉香,等.“4.23”特强沙尘暴天气成因分析[J].中国农学通报,2016,32(19):136-141.
[8]方宗义,朱福康,江吉喜,等.中国沙尘暴研究[M].北京:气象出版社,1997:1-10.
[9]李一平,德勒格尔玛,斯琴,等.内蒙古沙尘天气少发季节沙尘天气预报技术分析[J].高原气象,2013,33(5):1483-1491.
[10]姜学恭,云静波.三类沙尘暴过程环流特征和动力结构对比分析[J].高原气象,2014,33(1):241-251.
[11]钱莉,姚玉璧,杨鑫,等.河西走廊盛夏一次沙尘暴天气过程成因[J].中国沙漠,2016,36(2):459-466.
[12]冯鑫媛,王式功,程一帆,等.中国北方中西部沙尘暴气候特征[J].中国沙漠,2010,30(2):394-399.
[13]康玲,孙鑫,侯婷,等.内蒙古沙尘暴的分布特征[J].中国沙漠,2010,30(2):400-406.
[14]李余祥,何清,黄少鹏,等.南疆一次强沙尘暴前后塔中近地面各气象要素的变化特征[J].高原气象,2009,28(3):652-662.
[15]程海霞,丁治英,帅克杰,等.沙尘暴天气的高空急流统计特征空动力分析[J].南京气象学院学报,2006,29(6):806-814.
[16]谭志强,王敏,李婷,等.2014年8月15—16日宁夏强对流天气螺旋度分析[J].干旱气象,2015,33(6):926-933.
[17]许东蓓,任余龙,李文莉,等.“4.29”中国西北强沙尘暴数值模拟及螺旋度分析[J].高原气象,2011,30(1):115-124.
[18]陆慧娟,高守亭.螺旋度及螺旋度方程的讨论[J].气象学报,2003,23(6):684-691.
[19]程鹏,王宝鉴,孔祥伟,等.河西走廊一次强沙尘暴天气的螺旋度诊断[J].干旱气象,2013,31(1):144-149.
[20]王文,隆霄,李耀辉,等.“2002.3”强沙尘暴过程的中尺度动力学诊断分析[J].干旱气象,2004,22(3):17-21.