| 何生录,严应存,张亚珍,韩忠全,许学莲,张 娟.祁连山南麓汛期降水时空分布特征研究[J].沙漠与绿洲气象,2022,16(2):116~121 |
| 祁连山南麓汛期降水时空分布特征研究 |
| Spatial and Temporal Distribution of Precipitation in Flood Season at the Southern Foot of Qilian Mountains |
| 投稿时间：2021-01-26 修订日期：2021-08-05 |
| DOI：10.12057/j.issn.1002-0799.2022.02.016 |
| 中文关键词: 汛期 降水 时空特征 祁连山南麓 |
| 英文关键词:flood season precipitation spatio-temporal characteristics the southern foot of Qilian Mountain |
| 基金项目:国家自然(41765008, 41861049),青海省科技厅项目(2019-HZ-820,2021-ZJ-611),青海省气象局面上项目（QXMS2021-32）,青海省防灾减灾重点实验室开放基金. |
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| 中文摘要: |
| 利用 1961—2019 年祁连山南麓 12 个国家气象站汛期（5—9 月）逐日降水资料，采用线性趋势、相关分析、ArcGIS 空间分析和 Morlet 小波分析对祁连山南麓汛期降水时空分布特征进行分析研究。结果表明：(1）祁连山南麓汛期降水量呈显著增加趋势，降水日数呈减少趋势，7 月降水量最多，8 月降水强度最大。（2）汛期降水量、降水日数和降水强度均呈自西向东逐渐增加趋势，降水量高值区在门源，降水日数野牛沟最多，降水强度大通最大。（3）汛期降水集中度呈下降趋势，21 世纪后降水处于均匀化状态，降水集中度存在 5 a 左右的短周期和 20 a 左右的长周期变化，空间分布呈由东向西增加趋势。（4）小雨、中雨和大雨及以上雨量随海拔高度的升高在增多，雨量分别在 2 751.1、2 528.8 和 1 977.4 m 达到最大值；降雨量级越高，出现雨量最大值的海拔高度越低。 |
| 英文摘要: |
| Based on the daily precipitation data of 12 national meteorological stations at the southern foot of Qilian Mountains from 1961 to 2019，the spatial and temporal distribution characteristics of
precipitation in flood season （May to September） were analyzed by using linear trend，correlation analysis，ArcGIS spatial analysis and Morlet wavelet analysis.The results showed：（1）The precipitation in flood season at the southern foot of Qilian Mountains showed a significant increasing trend，while the precipitation days showed a decreasing trend，with the maximum precipitation in July and the maximum precipitation intensity in August.（2）Precipitation，precipitation days and precipitation intensity increased gradually from west to East in flood season.The high value area of precipitation was in Menyuan，with the largest number of precipitation days in Yeniugou and the largest precipitation intensity in Datong.（3）The precipitation concentration degree in flood season showed a downward trend.After entering the 21st century，the precipitation was in a state of homogenization.The precipitation concentration degree had a short period of about 5 years and a long period of about 20 years，and the spatial distribution showed an increasing trend from east to west. （4）The rainfall of light rain，moderate rain，heavy rain and above increased with altitude，and the rainfall reached the maximum at 2 751.1 ，2 528.8 and 1 977.4 m，respectively.The higher the category of rainfall，the lower the altitude at which the maximum rainfall occurred. |
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