The variation of precipitation and rain days for different intensity classes during the rainy season in the Qilian Mountains, Northwest China

Zhao Chuancheng; Ding Yongjian; Yao Shuxia

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The variation of precipitation and rain days for different intensity classes during the rainy season in the Qilian Mountains, Northwest China

机译：西北祁连山中雨季在雨季下雨季降水和下雨日的变化

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As an important indicator of climate change, precipitation variability is critical to the ecological environment in arid and semi-arid mountains. This study examined the variability and trends of precipitation and rain days in the Qilian Mountains based on meteorological station data during the rainy seasons of 1960-2017 using a non-parametric method. The results revealed the following. (1) Many major precipitation events occurred during the rainy season (precipitation amount and number of rain days accounted for 80% and 70% of the annual total, respectively) and the proportion of precipitation increased significantly with altitude. (2) The distribution of different intensity classes of precipitation was complex in different months and at different altitudes. The distribution of rain days of different intensity classes was similar to that of precipitation. Variation of precipitation and rain days was significant (not significant) in central and eastern parts (western parts and in the Hexi Corridor on the northern slopes) of the Qilian Mountains. Regions with significant (non-significant) increasing trends for both light and moderate rain were distributed above the upper portion, i.e., 2600-3200 m (in the Hexi Corridor on the northern slopes) of the Qilian Mountains. (3) Mutations of light rain and rain days occurred before the mid-1980s above the upper portion but late in the first decade of the twenty-first century in the lower portion (2000-2600 m). Mutations of moderate rain and moderate rain days occurred earlier than for light rain and light rain days; the abrupt change points occurred later with decreasing altitude.

机译：作为气候变化的重要指标，降水变量对干旱和半干旱山脉的生态环境至关重要。本研究审查了在1960 - 2017年雨季的气象站数据使用非参数方法的基于气象站数据的祁连山降水和下雨日的变化和趋势。结果表明以下。（1）在雨季期间发生了许多主要降水事件（降水量和雨天数占> 80％和>每年总数的70％），并且沉淀比例随高度而显着增加。（2）在不同的月份和不同的海拔地区，不同强度沉淀的分布复杂。不同强度类的雨水日的分布与降水相似。中央和东部零部件（西部零部件和北坡上河内走廊）的降水和下雨日的变化是显着的（不显着的）。具有显着（非显着）的区域增加光和中等雨水和中等雨量的趋势在上部的上方分布，即祁连山的2600-3200米（在北坡上的河西走廊）。（3）在20世纪80年代中期以上20世纪80年代中升之前发生了小雨和下雨的突变，但在下半部分（2000-2600米）的二十一世纪的第一个十年后。中度雨和中度下雨日的突变比小雨和小雨日更早发生;突然的变化点后来发生了较低的高度。

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来源
《Theoretical and applied climatology》 |2021年第2期|163-178|共16页
作者
Zhao Chuancheng; Ding Yongjian; Yao Shuxia;
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作者单位

Lanzhou City Univ Coll Geog & Environm Engn Lanzhou 730000 Peoples R China|Chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst State Key Lab Cryospher Sci Lanzhou 730000 Peoples R China;

Chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst State Key Lab Cryospher Sci Lanzhou 730000 Peoples R China;

Lanzhou City Univ Coll Math Lanzhou 730000 Peoples R China;

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正文语种 eng
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关键词
Precipitation; Rain days; Qilian Mountains; Mann-Kendall test;

机译：降水;雨天;祁连山;MANN-KENDALL测试;

The variation of precipitation and rain days for different intensity classes during the rainy season in the Qilian Mountains, Northwest China

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