[1]ZHANG Kexin,PENG Jiaoting,SU Zhihua,et al.Characteristics of Variation of Precipitation Concentration Index and Its Teleconnection Relationships with Large-scale Atmospheric Circulations in Gansu Province[J].Research of Soil and Water Conservation,2021,28(05):261-267.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 05
Page number:
261-267
Column:
Public date:
2021-08-20
- Title:
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Characteristics of Variation of Precipitation Concentration Index and Its Teleconnection Relationships with Large-scale Atmospheric Circulations in Gansu Province
- Author(s):
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ZHANG Kexin1,PENG Jiaoting1,SU Zhihua1,LIU Jinlin1,CAO Liguo2
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(1.School of Management Science and Engineering,Guizhou University of Finance and Economics,Guiyang 550025,China; 2.School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China)
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- Keywords:
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precipitation concentration index; temporal-spatial variability; atmospheric circulation index; Gansu Province
- CLC:
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P467
- DOI:
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- Abstract:
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The precipitation concentration index(PCI)is a powerful indicator for temporal precipitation distribution and is also very useful for the assessment of seasonal precipitation changes. The primary objectives of this study are to investigate and analyze the temporal-spatial variability patterns of annual and seasonal PCI values based on monthly precipitation data. These data were collected from 27 meteorological stations located throughout Gansu Province,for the period of 1961—2017. Additionally,the possible teleconnection with the largescale circulation pattern was investigated. The results reveal that the variation trend of annual PCI values had decreased at a rate of -0.54/decade in Gansu Province over the past 57 years. The regularity of the annual precipitation pattern increased in spring,summer,and autumn from southeast to northwest of Gansu Province. However,the winter precipitation dispersion and the pattern in the considered period were more regular than those of the other seasons. Furthermore,the relationship between the PCI and PDO,AO,ENSO,and SS presented significant periodic variations with PCI,indicating that changes in the PCI appeared to be rather complex and possibly related to global atmospheric characteristics. These results presented in this study indicate that the PCI is an essential feature for water resource planning,prediction of risk due to droughts or floods,and the management of natural resources.