| Climate change characters of precipitation in autumn among decades and years on Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2006.04.40 |
| Key Words: Loess Plateau precipitation in autumn decade climate change character |
| Author Name | Affiliation | | WANG We-i tai | Institute of Arid-meteorology CMA Key Laboratory of Arid Climate Change and Reducing Disaster,Lanzhou,Gansu 730020,China；Meteorological Bureau of Qingyang City,Xifeng,Gansu 745000,China | | ZHANG Tian-feng | Meteorological Bureau of Qingyang City,Xifeng,Gansu 745000,China | | YANG Min | Gansu Provincial Meteorogical Bureau,Lanzhou,Gansu 730020,China | | SHI Ying | Xifeng Primary Middle School,Xifeng,Gansu 745000,China | | HUANG Bin | Meteorological Bureau of Qingyang City,Xifeng,Gansu 745000,China | | WANG Yan-ling | Meteorological Bureau of Qingyang City,Xifeng,Gansu 745000,China |
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| Abstract: |
| Based on the autumn precipitation sequence data of 39 meteorological observation stations(1961～2000) with symmetrical distribution on Loess Plateau and Xifeng state benchmark climate station(1938～2003),and by applying the sub-analysis data of NCEP/NCAR(1968～2003) 500 hPa altitude anomaly fields,this paper studied the characters of accumulated precipitation anomaly among different years and decades.The result showed that the autumn precipitation of the whole region was partial to more in 1960s and less in 1990s on Loess Plateau;and the precipitation was partial to more in the north part and partial to less in the middle and south part in 1970s～1980s.There was a marked change character of autumn precipitation on Loess Plateau,that is,five years of transition change and six yeas of relative continuance phase.After the continuous less precipitation phase of 1990s,it has entered a relatively more precipitation phase,being propitious to the production of winter wheat.The atmosphere circumfluence background of precipitation in autumn was that in less precipitation yeas,the force of cold air from the polar region was feeble and the Xinjiang high-pressure ridge was strong;but in more precipitation years,the force of cold air from the polar region was strong and the Xinjiang low-pressure trough was active. |
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