| 苗运玲,卓芝正,张军,李如琦,王健.乌鲁木齐汛期降水集中度和集中期时空变化特征[J].沙漠与绿洲气象,2021,15(4):9~16 |
| 乌鲁木齐汛期降水集中度和集中期时空变化特征 |
| Concentration Degree(PCD) and Precipitation Concentration Period(PCP) in Flood Season in Urumqi |
| 投稿时间：2020-12-25 修订日期：2021-06-11 |
| DOI：10.12057/j.issn.1002-0799.2021.04.002 |
| 中文关键词: 汛期 降水 集中度 集中期 乌鲁木齐 |
| 英文关键词:flood season precipitation concentration degree concentration period Urumqi |
| 基金项目:新疆气象局重点项目（ZD201902）、中亚大气科学研究基金（CASS201707）和中国沙漠气象科学研究基金（SQJ2015001） |
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| 中文摘要: |
| 利用乌鲁木齐5个国家气象站1978-2019年5-9月逐日降水资料，统计分析逐候降水集中度（PCD）和集中期（PCP）变化趋势和时空分布特征。结果表明：近42 a乌鲁木齐汛期降水集中度和集中期均呈微弱下降趋势，表明汛期降水分配趋于均匀，降水集中期呈逐渐提前趋势；汛期降水集中度和集中期空间分布差异显著，降水集中程度由西向东逐渐增大，降水集中期出现时间由北向南逐渐推迟；汛期降水集中度在整个研究期内存在6 a、15 a左右周期变化，降水集中期存在12 a左右周期变化；对多降水年和少降水年降水集中度和集中期合成分析，发现少降水年降水集中程度高于多降水年，而降水集中期明显晚于多降水年。 |
| 英文摘要: |
| Based on the daily precipitation data at 5 meteorological stations in Urumqi from May to September from 1978 to 2019, the variation trend and spatial-temporal distribution characteristics of PCD and PCP were analyzed. The results show that: in recent 42 years, the precipitation concentration degree and concentration period in Urumqi in flood season show a weak downward trend, which indicates that the precipitation distribution in flood season tends to be uniform, and the precipitation concentration period gradually advances. The results show that there are significant differences in the spatial distribution of precipitation concentration degree and concentration period in flood season. The precipitation concentration degree increases gradually from west to East, and the occurrence time of precipitation concentration period delays gradually from north to south. During the whole study period, the precipitation concentration in flood season varies about 6 years and 15 years, while the precipitation concentration period varies about 12 years. It is found that the precipitation concentration degree in less precipitation years is higher than that in more precipitation years, and the precipitation concentration period is obviously later than that in more precipitation years. |
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