| Characteristics of precipitation variation in recent 61 years and its influence on ecological environment in Xingtai City |
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| DOI：10.7606/j.issn.1000-7601.2017.02.43 |
| Key Words: rainy days rainfall Mann-Kendall test curve sliding t test Xingtai |
| Author Name | Affiliation | | HAO Ju-fei | Xingtai Meteorological Bureau, Xingtai, Hebei 054000, China | | ZHANG Gong-wen | Handan Meteorological Bureau, Handan, Hebei 056001, China | | LI Zhi-xia | Xingtai Meteorological Bureau, Xingtai, Hebei 054000, China | | WANG Xiao-juan | Xingtai Meteorological Bureau, Xingtai, Hebei 054000, China | | YANG Yun-ling | Xingtai Meteorological Bureau, Xingtai, Hebei 054000, China |
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| Abstract: |
| Based on the daily precipitation data from 1954 to 2014 at Xingtai meteorological observatory in Hebei Province, the characteristics of precipitation variation were analyzed with the methods of linear trend analysis, Mann-Kendall mutation test and sliding t test. The results showed that the rainy days in each month declined rapidly along with the increase of rainfall grades, and the maximum monthly rainfall amount and rainy days appeared in July, being 18.67d and 150.46mm in average, respectively. The light rain days and light-moderate rain days showed a significant decrease by -3.17 d·10a-1 and -0.61 d·10a-1, respectively, while the days with other rain grades tended to decrease insignificantly; the total annual rainy days showed a significant decrease by -4.37 d·10a-1, in which the most obvious decline occurred in summer. The climate tendency rate of annual total rainfall was -18.23 mm·10a-1, in which the amount of light rain declined significantly by -5.22 mm·10a-1. The decline in total rainfall was caused by both the decrease of rainy days and the significant decrease of rainfall amount in light rain days and light-moderate rain days in summer. Furthermore, it was found that the mutation time of light rain days and light-moderate rain days was the mid and late 1970s and the end of 1960s, respectively, while the mutation time of total rain days and light rain amount was the early 1970s and the early 1980s, respectively. |
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