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Analyses of spring mean circulations for major andminor dust storm years in China-Mongolia area

Research in Cold and Arid Regions 2009年第4期1卷 361-371页

作者： MinHong Song 1,ZhengAn Qian 1,Ying Cai 1,ChungMing Liu 2 1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China.2.Department of Atmospheric Sciences,Taiwan University,Taipei 106,China. Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

To better understand the dust storm (hereafter ds) inducing circulation in the China-Mongolia (CM) ds activity area,the spring mean circulation features and differences on lower levels in three subregions of the CM ds area for the majorandminor-ds years have,as a whole (not partly),been analyzed,utilizing the National Centers for Environmental Prediction and the National Center for Atmospheric Research (NCEP/NCAR) reanalyzed gridded data,the observed ds frequency data in the CM area,and the composite analysis *** main conclusions are as follows:(1) Judging from the differences in the ds-inducing systems,dust origins,paths of invading cold air,and main ds-strike areas,the whole CM ds area is roughly divided into the three subre-gions:the East-,Middleand West-CM subregions (in this paper,referred to as E-,M-,and W-CM).(2) In major dss during spring over the E-CM,the middleand lower-level troughs or cyclones over the Japan Sea and northeastern China (NEC) *** invading cold air along the northeastern (NE) or north by east (NE) path often causes the ds in the E-CM *** nearly the opposite is true inminor ds during spring in E-CM.(3) In the major ds during spring over the M-CM region,the Mongolian troughs or cyclones are the main ds-inducing *** strong invading cold air along the northwestern (NW)or north by west (Nw) path causes the dss in the M-CM region.(4) In the major dss during spring over the W-CM region,the South Xinjiang heat lows prevail,the intruding cold air has a western path,and creates the dss in South Xinjiang.(5) In the past 50 years,the dss over the M-CM region have had the most severe impact on the preceding three subregions of the CM ds ***,ds activities over all of three regions of the CM area decreased in the past (particularly,over Mand W-CM regions since the *** there existed a short and sudden increasing in E-CM in the years 2000-2002.(6) It is circulation changes and desertification evolutions tha

关键词： East-,middleand west-CM subregions major andminor ds during spring ds-inducing system path of invading cold air trend of ds activity changes

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