| The character of index of arid dog days and multilayer hierarchical method for predetermination in Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2006.04.39 |
| Key Words: index of arid dog days(or draught index) EOF analysis multiplayer hierarchical Gansu province |
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| Abstract: |
| We calculated the Demadong arid index according to the data which got from 58 meteorological agencies and stations in Gansu Province,P.R.C.from 1961 to 2000 and also carried out EOF analysis.The results indicated as follow: The spatial distribution of arid dog days index and distribution of amount precipitation were very similar.The arid dog days had three kinds of main spatial distribution forms and 7 climatic zones.The breakout frequency of arid dog days was difference among the zones.The highest was in Tianshui area and the lowest was located at the west part of centre in Gansu Province.We got conclusions from aforesaid and determined the representative regional station,investigated forecast factors which had higher related coefficient absolute value and progressed forecast experiment by means of multiplayer hierarchical and gained some forecast results which were much better than usual methods. |