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高原气象  2017, Vol. 36 Issue (6): 1557-1566    DOI: 10.7522/j.issn.1000-0534.2017.00014
论文     
连年干旱背景下洱海流域降水的精细化特征
徐安伦1, 李育1, 杨帆2, 苏锦兰1, 董保举1, 孙绩华3
1. 大理国家气候观象台, 云南 大理 671003;
2. 云南省洱源县气象局, 云南 洱源 671200;
3. 云南省气象台, 云南 昆明 650034
Fine-scale Characteristics of Rainfall in Erhai Lake Basin under Continuous Drought Conditions
XU Anlun1, LI Yu1, YANG Fan2, SU Jinlan1, DONG Baoju1, SUN Jihua3
1. Dali National Climate Observatory, Dali 671003, Yunnan, China;
2. Eryuan Meteorological Station of Yunnan Province, Eryuan 671200, Yunnan, China;
3. Yunnan Meteorological Observatory, Kunming 650034, Yunnan, China
 全文: PDF(5311 KB)  
摘要: 利用2010-2015年洱海流域22个自动气象站资料,分析了连年干旱背景下洱海流域降水的精细化时空分布特征。结果显示,(1)洱海流域降水在时间上分布不均匀,年内降水主要集中于夏、秋两季,而且夜雨特征明显;日内降水量、降水强度和降水小时数分别在06:00(北京时,下同),04:00和06:00出现峰值,分别在13:00,23:00和11:00出现谷值;长历时降水事件对累计降水量的贡献率最大,中历时的贡献率次之,短历时的贡献率最小。(2)在空间上分布差异比较显著,洱海湖区年均降水量西部多东部少,沿着点苍山山脚一线,春、夏、秋、冬四季和全年的降水量、降水小时数以及不同量级的降雨日数均偏多,一般在银桥镇双阳出现大值中心,此大值区域处于盛行风(东风)、次盛行风(东东南风)的上风向和第三盛行风(西西北风)的下风向。(3)洱海流域降水分布与低纬高原季风气候、洱海流域复杂地形以及盛行风效应等因素紧密联系。
关键词: 洱海流域降水精细化特征    
Abstract: Based on the 2010-2015 hourly rainfall data from 22 automatic weather stations in Erhai Lake basin, the fine-scale characteristics of rainfall was analyzed under continuous drought conditions. The results show that the temporal distribution of rainfall in Erhai Lake basin is uneven, which means that the rainfall is mainly concentrated in summer and autumn, and the nocturnal rainfall is obvious. The peaks of rainfall amount, rainfall intensity and rainfall hours appear around 06:00, 04:00 and 06:00 respectively, and their valleys around 13:00, 23:00 and 11:00 (Beijing time) respectively. The contributed percentage is the biggest for long duration rainfall events to the accumulated rainfall amount, bigger for medium duration rainfall events, the smallest for short duration rainfall events. The spatial distribution of rainfall in Erhai Lake basin is significant difference, which means that annual rainfall amount in west is more than that in east of the Erhai Lake area. The rainfall amount, and rainfall hours and different magnitude rainfall days are larger in spring, summer, autumn, winter and in whole year along Diancangshang Mountains line, and their largest values often appear in Yinqiao town, Dali city, Yunnan province. This largest values region is located in the upwind of prevailing wind (east wind), the second prevailing wind (east southeast wind) and in the downwind of the third prevailing wind (west northwest wind). In addition, the temporal and spatial distribution of rainfall in Erhai Lake basin is closely related to the monsoon climate, complex terrain, prevailing wind effect and so on.
Key words: Erhai Lake basin    rainfall    fine-scale characteristic
收稿日期: 2016-11-07 出版日期: 2017-12-20
ZTFLH:  P466  
基金资助: 云南省气象局科研项目(GY201602);大理州气象局2015年度科技项目;国家自然科学基金重点项目(91537212);云南省创新引导与科技型企业培育计划(2016RA096)
作者简介: 徐安伦(1981),男,云南宣威人,高级工程师,主要从事复杂地形区大气边界层、大气湍流及陆面过程的观测研究E-mail:xualun@126.com
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引用本文:

徐安伦, 李育, 杨帆, 苏锦兰, 董保举, 孙绩华. 连年干旱背景下洱海流域降水的精细化特征[J]. 高原气象, 2017, 36(6): 1557-1566.

XU Anlun, LI Yu, YANG Fan, SU Jinlan, DONG Baoju, SUN Jihua. Fine-scale Characteristics of Rainfall in Erhai Lake Basin under Continuous Drought Conditions. PLATEAU METEOROLOGY, 2017, 36(6): 1557-1566.

链接本文:

http://www.gyqx.ac.cn/CN/10.7522/j.issn.1000-0534.2017.00014        http://www.gyqx.ac.cn/CN/Y2017/V36/I6/1557

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