Multiple Time Scales Characteristic of Precipitation in Recent 50 Years of Upper and Middle Reach of Yellow River
Abstract: Based on the yearly and monthly precipitation data of 45 stations from 1961 to 2011 over the up-per and middle reach of Yellow River (UMRYR), by the method of climate tendency rate, precipita-tion index, concentration degree and period, the precipitation interannual variation and distribu-tion characteristic and its evolution trend were analyzed. The results show that: 1) The annual precipitation rapidly declines from southeast to northwest, and there was a rain shadow area from Lanzhou to Huining of middle Gansu province. The two climate change sensitive areas were source area of the Yellow River and middle and east of Gansu loess plateau. The precipitation increased in source area of the Yellow River, mean value of climate tendency rate was 9.5 mm/10a. The drought trend was obvious in middle and east of Gansu loess plateau, average value of climate tendency rate was −23.4 mm/10a. 2) There were significant difference of mobile trend and track of 400 mm rainfall contour between source area and middle reach of the Yellow River. In source area of the Yellow River, the trend of 400 mm rainfall contour moved north, but in middle reach of the Yellow River the contour obvious moved southeast before 2000, and regressed to northwest after 2000. 3) The general variation trend of seasonal distribution of precipitation in UMRYR were that the precipitation reduced obviously in spring and summer but increased significantly in autumn, especially after 2000. The variation trend of precipitation in each season was inconsistent in different areas, and the area where seasonal distribution of precipitation was obvious was Gu-anzhong plain. 4) The precipitation concentration period of UMRYR was in July, but concentration period of source area was slightly earlier than middle reach of the Yellow River. The precipitation concentration degree increased from southeast to northwest, and the value was between 0.45 - 0.71.
文章引用: 夏 权 , 吴芳蓉 , 陈少勇 (2014) 近50年黄河上中游降水多时间尺度特征分析。 气候变化研究快报， 3， 154-163. doi: 10.12677/CCRL.2014.33021
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