| Change of the ten-day precipitation and its relationship with soil moisture in the rainfed area east of the Yellow River in Gansu province |
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| DOI：10.7606/j.issn.1000-7601.2011.02.40 |
| Key Words: rain-fed agricultural area ten-day precipitation soil moisture Gansu Province |
| Author Name | Affiliation | | LU Dengrong | Institute of Arid Meteorology， China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Proince，Key Open Laboratory of Arid Climatic Change and Disaster Reducion, Lanzhou, Gansu 730020，China
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United Data Laboratory of Gansu Provincial Meteorological Bureau and Lanzhou University， Lanzhou, Gansu 730020，China | | HUANG Bin | Institute of Arid Meteorology， China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Proince，Key Open Laboratory of Arid Climatic Change and Disaster Reducion, Lanzhou, Gansu 730020，China
Gansu Qingyang Meteorological Bureau, Xifeng， Gansu 745000，China | | WANG Jinsong | Institute of Arid Meteorology， China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Proince，Key Open Laboratory of Arid Climatic Change and Disaster Reducion, Lanzhou, Gansu 730020，China |
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| Abstract: |
| Based on the daily precipitation and the soil moisture data from 1971~2007, analysis is made of the spatial distribution and climatic variability of ten day precipitation， and the relationship between the change of ten-day precipitation and soil moisture . The data are from 13 meteorological stations over the rain fed area east of Yellow River in Gansu Province. The results show that the distribution of every ten day average precipitation presents as two styles, i.e. the southern type and the eastermn type . The area with the biggest amount of precipitation is located in the southern (east-emn) part of the study area and the precipitation decreases from south (east) to north (west) when the distribution of pre-cipitation shows the southern (easterm) type. In recent 37 years, the occurrence probability of southermn (eastermn) type is 37 (63) percent and the main occurrence period is during the first ten -day in March (last ten-day in June ) and the mid ten-day in June (last ten day in November). The tendency of precipitation change appears significant decreasing for the first ten-day in March，the mid ten-day in April, the first ten-day in September and the first ten day in October. There exists，in a sense, a significant positive correlation between the ten day precipitation and the corresponding ten-day soil moisture，while the time of soil thawing and the relative amount of precipitation also have influence on this correlation. |
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