宁夏一次大风扬沙天气过程机制分析

干旱区地理 ›› 2017, Vol. 40 ›› Issue (6): 1134-1142.

宁夏一次大风扬沙天气过程机制分析

谭志强^1,2,3, 桑建人^1,2,4, 纪晓玲^1,2,3, 邵建^1,2,3, 朱晓炜^1,2,4

1. 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室, 宁夏银川 750002;
2. 宁夏气象防灾减灾重点实验室, 宁夏银川 750002;
3. 宁夏气象台, 宁夏银川 750002;
4. 宁夏气候中心, 宁夏银川 750002

收稿日期:2017-06-11 修回日期:2017-09-01 出版日期:2017-11-25
通讯作者: 朱晓炜.E-mail:zhxw1029@163.com
作者简介:谭志强(1980-),男,江苏连云港人,工程师,硕士,研究方向为短期预报工作.E-mail:tanzhiqiang2001@nuist.edu.cn
基金资助:
宁夏环境保护科学研究项目，宁夏自然科学基金（编号：NZ15207）

Mechanism of a strong wind and blowing sand process in Ningxia

TAN Zhi-qiang^1,2,3, SANG Jian-ren^1,2,4, JI Xiao-ling^1,2,3, SHAO Jian^1,2,3, ZHU Xiao-wei^1,2,4

1. Key Laboratory of Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, CMA, Yinchuan 750002, Ningxia, China;
2. Key Laboratory of Meteorological Disaster Prevention and Mitigation in Ningxia, Yinchuan 750002, Ningxia, China;
3. Ningxia Meteorological Observatory, Yinchuan 750002, Ningxia, China;
4. Ningxia Climate Center, Yinchuan 750002, Ningxia, China

Received:2017-06-11 Revised:2017-09-01 Online:2017-11-25

摘要/Abstract

摘要： 利用宁夏25个常规地面观测站逐时资料和欧洲中期天气预报中心（ECMWF）ERA-Interim逐6 h 0.125º×0.125º分辨率再分析资料，对宁夏2016年5月11日大风扬沙天气过程的天气形势、影响系统及其热力、动力条件和形成机制进行了分析。结果表明：（1）大风和扬沙呈现出时间位相上的不一致性，沙尘超前大风约6 h。（2）200 hPa高空急流、500 hPa锋区、700 hPa低空急流和地面冷锋是此次过程的主要影响系统。（3）大风在不同阶段对扬沙起不同作用，在初期有利于扬沙的传输，后期对扬沙起抑制作用。（4）动量下传和变压风是大风形成和发展的直接原因，感热通量通过加强地面湍流形成混合层，从而引导动量下传是其间接原因，动量下传的重要机制是对流层高层高位涡的下传，过程风力最强时位涡高值区（≥2.0 PVU）由200 hPa下传至520 hPa。（5）扬沙的产生主要是冷平流和感热通量形成的热力不稳定共同作用的结果，变压风和动量下传大风是扬沙的输送机制，次级环流缺失和冷平流中心过低（750 hPa）对沙尘输送高度的抑制作用是沙尘天气偏弱的主要原因。

关键词: 扬沙, 动量下传, 感热通量, 冷平流, 变压风, 不稳定层结

Abstract: By using the data from 25 observation stations in Ningxia,the sounding data from Yinchuan observatory and the ECMWF ERA-Interim 6-hourly reanalysis data with resolution 0.125º×0.125º,the weather situation, the influence system,the thermal,the dynamic conditions and the formation mechanism of the strong wind and weak dust process on May 11,2016 are analyzed. The results show that the strong wind and dust present a time phase inconsistency characteristics,the dust reaches its strongest stage ahead the wind 6 hours and tends to die out at the strongest stage of the wind. The 200 hPa high-level jet flow,500 hPa frontal zone,700 hPa low-level jet flow and the ground cold front is the main influencing system. Strong wind in different stages plays different roles in dust,conducive to the transmission of the sand in the early stage and restrains the development of the sand in the later stage. Further analysis shows that the high momentum carried by the 200 hPa high-level jet flow passes down through 500 hPa frontal zone,which is momentum down,and contributes to the formation of 700 hPa jet flow. The important mechanism of momentum transfer is the downward transmission of high level high vortex in the troposphere,potential vorticity region (≥2.0 PVU)down to 520 hPa with the strongest wind. At the same time,the downward momentum transmission is accompanied by the downward transmission of the cold advection in the upper air,which leads to the increase of the ground air pressure and the formation of the isallobar wind. Cold advection that is transmitted to the lower layer and surface sensible heat flux makes the atmospheric stratification unstable,through strengthening the ground turbulence to form a hybrid layer,which makes the high momentum of the 700 hPa jet flow spread to the ground and increase the surface wind speed and the maintenance and development of the dust. It can be seen that the momentum transportation downward and isallobar wind are the direct mechanisms for the formation and the development of strong winds,and the sensible heat flux is the indirect mechanism. The occurrence and development of dust is due to thermal unstable stratification,which is caused by the cold advection and the surface sensible heat. Isallobar wind and the wind formed by downward momentum are the transport mechanism of the dust. Furthermore,the inhibition effect of cold advection center (750 hPa)and the absence of secondary circulation lead to the weakness of the dust. Atmospheric stratification tends to bring the end of the dust,and the downward momentum transportation is the direct cause of the demise of the windy weather.

Key words: blowing sand, momentum transportation downward, sensible heat flux, cold advection, isallobar wind, unstable stratification

中图分类号:

P425.4⁺7

谭志强, 桑建人, 纪晓玲, 邵建, 朱晓炜. 宁夏一次大风扬沙天气过程机制分析[J]. 干旱区地理, 2017, 40(6): 1134-1142.

TAN Zhi-qiang, SANG Jian-ren, JI Xiao-ling, SHAO Jian, ZHU Xiao-wei. Mechanism of a strong wind and blowing sand process in Ningxia[J]. , 2017, 40(6): 1134-1142.

参考文献

[1] 曾淑玲,程一帆,王式功,等.我国西北和内蒙古地区春季沙尘暴的年代际变化及原因探析[J]. 中国沙漠,2010,30(5): 1200-1206.[ZENG Shuling,CHENG Yifan,WANG Shigong, et al. Decadal change of spring sanddust storm in northwest and Inner Mongolia of China and its cause[J]. Journal of Desert Research, 2010,30(5):1200-1206.]

[2] 姜学恭,李彰俊,程从兰,等. 地面加热对沙尘暴数值模拟结果的影响研究[J]. 中国沙漠,2010,30(1):182-192.[JIANG Xuegong, LI Zhangjun,CHENG Conglan,et al. Effects of surface heating flux on the numerical simulation results of dust storm[J]. Journal of Desert Research,2010,30(1):182-192.]

[3] 王伏村,徐东蓓,王宝鉴,等. 河西走廊一次特强沙尘暴的热力动力特征分析[J]. 气象,2012,38(8):950-959.[WANG Fucun, XU Dongbei,WANG Baojian,et al. Diagnostic analysis of thermal and dynamical characteristics of a heavy dust storm in Hexi Corridor[J]. Meteorological Monthly,2012,38(8):950-959.]

[4] 尹宪志,任金龙,马旭洁,等. 2011 年4 月28-29 日中国北方强沙尘暴发生机制位涡分析[J]. 中国沙漠,2013,33(1):195- 204.[YIN Xianzhi,REN Yulong,MA Xujie,et al. A potential vorticity analysis on the occurrence mechanism of a strong sandstorm in northern China on April 28-29,2011[J]. Journal of Desert Research,2013,33(1):195-204.]

[5] 赵庆云,张武,吕萍,等. 河西走廊“2010.04.24”特强沙尘暴特征分析[J]. 高原气象,2012,31(3):688-696.[ZHAO Qingyun, ZHANG Wu,LU Ping,et al. Characteristics analysis of the severe dust event occurred in Hexi Corridor on April 24,2010[J]. Plateau Meteorology,2012,31(3):688-696.]

[6] 段海霞,李耀辉,蒲朝霞,等. 高空急流对一次强沙尘暴过程沙尘传输的影响[J]. 中国沙漠,2013,33(5):1431-1472.[DUAN Haixia,LI Yaohui,PU Zhaoxia,et al.The influence of high level jet on dust transportation in a sandstorm process[J]. Journal of Desert Research,2013,33(5):1431-1472.]

[7] 陈豫英,赵光平. 两次典型强沙尘暴过程的对比分析[J]. 气象, 2003,29(9):18-22.[CHEN Yuying,ZHAO Guangping. Comparative analysis of two typical severe sandstorm events[J]. Meteorological Monthly,2003,29(9):18-22.]

[8] 陈豫英,陈楠,谭志强,等. 热力作用对宁夏不同强度沙尘天气的影响[J]. 高原气象,2015,34(6):1668-1676.[CHEN Yuying, CHEN Nan,TAN Zhiqiang,et al. Impact of thermal action on different intensity sandstorms in Ningxia[J]. Plateau Meteorology, 2015,34(6):1668-1676.]

[9] 陈豫英,陈楠,谭志强. 宁夏不同强度沙尘天气动力机制[J]. 中国沙漠,2015,35(2):438-447.[CHEN Yuying,CHEN Nan, TAN Zhiqiang. Dynamic mechanism of dust weather with different intensities in Ningxia[J]. Journal of Desert Research,2015, 35(2):438-447.]

[10] 陈豫英,陈楠,谭志强,等.“2013.3.9”宁夏强沙尘暴天气的热力动力条件分析[J]. 干旱区地理,2016,39(2):285-293.[CHEN Yuying,CHEN Nan,TAN Zhiqiang,et al. Condition analysis of thermal and dynamical characteristics of heavy duststorm in Ningxia on March 9,2013[J]. Arid Land Geography, 2016,39(2):285-293.]

[11] 郑广芬,赵光平,李艳春,等. 宁夏中北部地区沙尘暴天气发生过程中的不稳定条件分析[J]. 中国沙漠,2004,24(6):701- 705.[ZHENG Guangfen,ZHAO Guangping,LI Yanchun,et al. Analysis on unstable condition in sandstorm processes in middle and north area of Ningxia[J]. Journal of Desert Research,2004, 24(6):701-705.]

[12] 陈晓光,纪晓玲,刘庆军,等. 200 hPa 高空急流与宁夏春季沙尘暴过程的特征分析[J]. 中国沙漠,2006,26(2):238-242.[CHEN Xiaoguang,JI Xiaoling,LIU Qingjun,et al. Relationship between 200 hPa jet and sandstorm during spring in Ningxia[J]. Journal of Desert Research,2006,26(2):238-242.]

[13] 陈楠,陈豫英,范小明,等. 西北地区东部沙尘暴转型的环流演变及差异特征分析[J]. 干旱区地理,2010,33(5):676-683.[CHEN Nan,CHEN Yuying,FAN Xiaoming,et al. Circulation evolvement and its diversity characteristics at the transition period of sandstorm occurrence frequency at the east part of northwest China[J]. Arid Land Geography,2010,33(5):676-683.]

[14] 赵蔚,丁永红,辛尧胜,等. 宁夏一次(2009-04-23)区域性沙尘暴天气的热力、动力触发机制[J]. 宁夏工程技术,2010,9(2): 97-100.[ZHAO Wei,DING Yonghong,XIN Yaosheng,et al. Thermodynamics and dynamics trigger mechanism of a regional dust storm weather in Ningxia[J]. Ningxia Engineering Technology, 2010,9(2):97-100.]

[15] 冯建民. 宁夏天气预报手册[M]. 北京:气象出版社,2012:139.[FENG Jianmin. The weather forecast manual of Ningxia[M]. Beijing:China Meteorological Press,2012:139.]

[16] 邬仲勋,王式功,尚可政,等. 冷空气大风过程中动量下传特征[J]. 中国沙漠,2016,36(2):467-473.[WU Zhongxun,WANG Shigong,SHANG Kezheng,et al. The characteristics of momentum transfer during a cold strong wind process[J]. Journal of Desert Research,2016,36(2):467-473.]

[17] 孙永刚,孟雪峰,荀学义,等. 温度平流在沙尘暴和大风预报中的差异分析[J]. 气象,2014,40(11):1302-1307.[SUN Yonggang, MENG Xuefeng,XUN Xueyi,et al. Difference analysis of temperature advection in servere sandstorm and strong wind prediction[J]. Meteorological Monthly,2014,40(11):1302- 1307.]

[18] 钱莉,薛生梁,杨永龙,等. 民勤“2010.4.24”黑风天气过程的稳定度分析[J]. 干旱区地理,2012,35(3):408-414.[QIAN Li, XUE Shengliang,YANG Yonglong,et al. Stability of black sandstorm in Minqin on April 24,2010[J]. Arid Land Geography, 2012,35(3):408-414.]

[19] 彭小桐,黄辉成,杨爱玲. 基于溃变理论的沙尘大风天气预测研究[J]. 气象与减灾研究,2014,37(2):19-22.[PENG Xiaotong, HUANG Huicheng,YANG Ailing. Study of dust windy weather forecasting based on“blown-up”theory[J]. Meteorology and Disaster Reduction Research,2014,37(2):19-22.]