|
|
|
| Variation of the East Asian Subtropical Westerly Jet Stream in Spring and Its Relationship with Dust Weather in China |
| Liu Shengyuan1,2, Wang Jinyan1, Wang Shigong1, Shang Kezheng1, Ni Jiangbo1 |
1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
2. 93956 PLA Troops, Zhangye 734015, Gansu, China |
|
|
|
|
Abstract The variation characteristics of the East Asian Subtropical Westerly Jet Stream and its relationship with spring dust weather in China in 1980-2012 is analyzed by using ERA-Interim global atmospheric reanalysis data from the European Centre for Medium-range Weather Forecasts and the standstorm days data in northern China. The results show that the intensity of jet center and the influence scope of the East Asian Subtropical Westerly Jet Stream in winter are much stronger and broader than those in other season, and the center of jet is located in Xinjiang in summer, the position is the most north and west for the whole year, and the intensity is weakest. Overall, the jet axis trends to move northwards in 1980-2012, the center of jet is moving east slightly, the relative intensity of jet increases with years, and it has significantly negative correlation with the sandstorm days value in spring. In the year with more sandstorm days in spring, the East Asian Subtropical Westerly Jet is weaker, but in the source area of dust such as most parts of the eastern Kazakhstan, Mongolia and Inner Mongolia, southern Xinjiang of China, the latitudinal wind speed increases at 200 hPa, and the distribution of difference fields of the wind speed and geopotential height at 500 hPa and 850 hPa is conducive to increase the ground wind speed in the source area of dust. In the source area of dust, westerly wind speed of high-level increases, the momentum transfer to the low-level, which causes the strong wind on the ground, thus easy to produce sandstorm.
|
|
Received: 12 June 2014
Published: 20 March 2015
|
|
|
[1] 罗敬宁,郑新江,朱福康,等.中国沙尘暴发生的气象危险度研究[J].中国沙漠,2011,31(1):185-190.
[2] 钱正安.关于甘、宁部分地区“93.5.5”特强沙尘暴灾害的调查报告[J].大气情报,1993,30(4):1-13.
[3] 胡隐樵,光国宁.强沙尘暴微气象特征和局地触发机制[J].大气科学,1997,21(5):581-589.
[4] 钱正安,宋敏红,李万元.近50年中国北方沙尘暴的分布及变化趋势分析[J].中国沙漠,2002,22(2):106-111.
[5] 丁瑞强,王式功,尚可政,等.近45 a中国沙尘暴和扬沙天气变化趋势和突变分析[J].中国沙漠,2003,23(1):306-310.
[6] 郑新江,刘诚,崔小平,等.沙尘暴天气的云图特征分析[J].气象,1995,21(2):27-31.
[7] 邱金恒,孙金辉.沙尘暴的光学遥感及分析[J].大气科学,1994,18(1):1-10.
[8] 王劲松,俞亚勋,赵建华.中国北方典型强沙尘暴的地面加热场特征分析[J].中国沙漠,2004,24(5):599-602.
[9] 郭慧,王式功,李栋梁,等.甘肃春季沙尘暴环流特征及其时间尺度诊断分析[J].中国沙漠,2004,24(5):593-595.
[10] 康凤琴,李耀辉,吕世华.2001年4月8日强沙尘暴天气的数值模拟研究[J].中国沙漠,2003,23(6):681-684.
[11] 孙淑清,翟国庆.低空急流的不稳定性及其对暴雨的触发作用[J].大气科学,1980,4(4):327-337.
[12] 翟国庆,丁华君,孙淑清.与低空急流相伴的暴雨天气的诊断研究[J].大气科学,1999,23(1):112-118.
[13] 翟国庆.对流层高层偏北气流在梅雨暴雨中的作用[J].气象学报,1998,56(1):68-76.
[14] 翟国庆,高坤,孙淑清.梅雨期高层流场对低层急流及中尺度系统影响的数值实验[J].气象学报,1997,55(6):714-725.
[15] 丁治英,张兴强,何金海,等.非纬向高空急流与远距离台风中尺度暴雨的研究[J].热带气象学报,2001,17(2):144-153.
[16] 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.
[17] 杨先荣,王劲松,张锦泉,等.高空急流带对甘肃沙尘暴强度的影响[J].中国沙漠,2011,31(4):1046-1051.
[18] 程海霞,丁治英,帅克杰,等.近5a中国沙尘暴与高空急流关系的统计分析[J].中国沙漠,2005,25(6):891-896.
[19] 尹树新,赵亚贤.西风急流异变对“5.5”西北地区沙尘暴的影响[C]//中国沙尘暴研究.北京:气象出版社,1997:65-69.
[20] 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):1461-1472.
[21] 康林,季明霞,黄建平,等.欧亚大气环流对中国北方春季沙尘天气的影响[J].中国沙漠,2013,33(5):1453-1460.
[22] 段海霞,赵建华,李耀辉.2011年春季中国北方沙尘天气过程及其成因[J].中国沙漠,2013,33(1):179-186. |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
2015, Vol. 35 
