The Variability of Spring Sand and Dust Storm Systems in Northeast Asia from 1980 to 2011
- 作者：杨元琴王继志牛涛周春红陈淼刘冀彦
- 会议时间：2012-09-01
- 关键词：SDS weather system ; process ; wave-like trends ; CWT method
- 母体文献：第29届中国气象学会年会论文集
- 会议名称：第29届中国气象学会年会
- 会议地点：沈阳
- 主办单位：中国气象学会
- 语种：chi
摘要
The characteristic distributions of regional sand and dust storm (SDS) from 1980 to 2011 were investigated using a variety of data sources including the shared WMO meteorological elements data from surface stations,atmospheric sounding data,Chinese high density weather data,NCEP-NCAR re-analysis data as well as the archived Chinese original weather maps.The study applies the concentration-weighted trajectory (CWT) method for the deposited SDS to develop the SDS characteristic influence domain from the discrete station data and to track and analyze the large scale regional SDS processes in Northeast Asia.A spline trend analysis method was used to investigate the strength variability of the SDS systems.The results show that during the period of 1980 to 2011,the SDS processes have a wave-like behavior,featuring both a historical persistence and abrupt transition with about a 10 year high-low oscillation.Through a composite analysis of atmospheric circulation during high and low SDS years,it is found that the SDS occurrences are closely related to the anomaly of arctic vortex strength,mid-latitude westerly and circulation patterns around Lake Baikal.During the high frequency years,the meridianal flows at the top and mid troposphere above the high SDS corridor in East Asia,i.e.from Lake Balkhash,along the area of Chinese Northwest and North,Korean Peninsula and Japan island,are apparently stronger than during the low SDS years,favoring the development and transport of SDS in the mid-latitude regions.