Abstract
Using the daily precipitation data at 89 stations during 1975–2017 in the Qin-ba Mountain area, variation characteristics of different-grade precipitation in the north and south of the Qin-ba Mountain area are analyzed by the linear regression, Mann-Kendall test, and correlation analysis, based on the precipitation grade classification standard proposed by Dai Aiguo and the division of the geo-ecological boundary in mountain range presented by Kang Muyi. The results are as follows: (1) Light rain occurs most frequently, and the percentage of light rain in the north is twice that of the southern region. Rainstorms are the most rare. Precipitation above 800 mm mainly occurs south of the study area, and the result is consistent with the boundary between the north and south of the precipitation. (2) The beginning of precipitation mainly occurs in early April. The high precipitation concentration (PCD) in the north is an important reason for the debris flow disaster. The north-south precipitation concentration period (PCP) is about 1 month ahead of the central part. (3) In the past 43 years, the overall precipitation in the Qin-ba Mountain area has shown a decreasing trend, with the frequency of light rain and the percentage of heavy rain decreasing year by year. (4) The frequency of light rain is negatively correlated with other frequencies. In addition, the fewer days of precipitation, the later the precipitation concentration period (PCP) occurs, which means that the disaster occurs later.
Highlights
In recent years, the global climate has changed significantly
The high precipitation concentration (PCD) in the north is an important reason for the debris flow disaster
(4) The frequency of light rain is negatively correlated with other frequencies
Summary
The global climate has changed significantly. Precipitation is one of the most sensitive meteorological factors in response to the global change, and its frequency and intensity are closely related to Responsible Editor: Zhihua Zhang. As a traditional rain-fed agriculture area and one of the regions that most influenced by extreme precipitation events at the same latitude (Yang et al 2014), it is of great importance to reveal the variation characteristics of precipitation in this area Previous studies in this area mainly focused on the variations of precipitation amount at different spatial and temporal scales (Gao et al 2012; Jiang et al 2012; Zhu et al 2014; Liu et al 2008) or the characteristic analysis of extreme precipitation events (Li et al 2015). According to the geo-ecological boundary in Qinling Mountain Range based on the distribution of climate-vegetation contours proposed by Kang and Zhu (2006), the temporal and spatial distribution characteristics of precipitation in the north and south of the Qin-ba Mountain area are analyzed (Fig. 1)
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