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[1]ZHEN Ying,HE Jing.Spatial and Temporal Characteristics and Mutation Analysis of Precipitation Variation in Aba Prefecture on the Southeast Margin of Qinghai-Tibet Plateau[J].Research of Soil and Water Conservation,2018,25(04):195-199.

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Spatial and Temporal Characteristics and Mutation Analysis of Precipitation Variation in Aba Prefecture on the Southeast Margin of Qinghai-Tibet Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 04 Page number: 195-199 Column: Public date: 2018-06-13

Title:: Spatial and Temporal Characteristics and Mutation Analysis of Precipitation Variation in Aba Prefecture on the Southeast Margin of Qinghai-Tibet Plateau

Author(s):: ZHEN Ying¹, HE Jing²; 1. School of Geography & Resource Science, Neijiang Normal University, Neijiang, Sichuan 641199, China;
2. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China

Keywords:: Aba Prefecture; precipitation; concentration; concentrated period

CLC:: P426.6;P461

DOI:: -

Abstract:: According to the precipitation data of 6 meteorological stations in Aba Prefecture from 1961 to 2010, temporal and spatial distribution of precipitation and its mutation were analyzed by annual uneven distribution coefficient(Cut), precipitation concentration degree (PCD), precipitation concentration period (PCP), Mann-Kendall test method and other methods combining with GIS spatial analysis technology. The results showed that: (1) in the past 50 years, precipitation in Aba was increasing, and the inclination rate was 4.25 mm per decade; the distribution of non-uniformity coefficient in precipitation was decreasing, the mean was 0.92. PCD and PCP were also declining, and the mean value was 0.57; the average value of PCP was 13.43 years, and Mann-Kendall curves was expressed as ‘ascending and descending alternately and stable’ and ‘descending-ascending-descending-ascending’; (2) the annual precipitation was decreasing from south to northeast and south, and Cut increased from east to northwest; PCD increased from east to west, and PCP had the characteristics of ‘southern early, northern late’; (3) for the synthetic analysis, PCD in the year with larger precipitation was slightly larger than that of the year with less precipitation, and it was larger in the southern part than the northern region. PCP with larger precipitation was later than the year with less precipitation, and PCP was later in northwest than any other place.

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