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杨晓玲,丁文魁,王鹤龄.石羊河流域降雪初、终日及雪期特征分析[J].沙漠与绿洲气象,2019,13(5):76~81
石羊河流域降雪初、终日及雪期特征分析
Characteristic Analysis of Snowfall First and Last Date and Snowfall Period in Shiyang River Basin
投稿时间:2018-09-07  修订日期:2019-01-16
DOI:10.12057/j.issn.1002-0799.2019.05.011
中文关键词:  降雪初、终日  降雪期  特征分析  石羊河流域
英文关键词:snowfall first and last date  snowfall period  characteristic analysis  Shiyang River Basin
基金项目:国家自然基金“半干旱区春小麦农田干旱解除的降雨过程调控机制”(41775107)、“气温升高和降水波动对半干旱区春小麦协同影响”(41305134)资助。
作者单位E-mail
杨晓玲 甘肃省武威市气象局 wwqxj6150343@163.com 
丁文魁 甘肃省武威市气象局  
王鹤龄 中国气象局兰州干旱气象研究所  
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中文摘要:
      利用1960—2017年石羊河流域5个气象站点降雪和气温观测资料,采用气候诊断分析方法,分析了石羊河流域降雪初、终日及降雪期的时空变化特征及与气温和海拔高度的关系。结果表明:降雪初日为山区(9月6日)早于平原区(10月25日),平原区早于荒漠区(11月1日);降雪终日为山区(6月12日)晚于平原区(4月16日),平原区晚于荒漠区(4月4日);降雪期为山区(279 d)长于平原区(172 d),平原区长于荒漠区(155 d)。各地降雪初、终日及降雪期存在一定的异常性,正常降雪初、终日及降雪期年概率均超过67%。年、年代降雪初日呈推迟趋势,气候倾向率在0.844~3.101 d/10 a;降雪终日(除凉州和古浪外)呈提早趋势,气候倾向率在-3.702~1.604 d/10 a;降雪期呈缩短趋势,气候倾向率在-7.447~-0.097 d/10 a。降雪初、终日及降雪期与气温和海拔高度呈极显著相关性,气温每升高1 ℃,初日推迟约6.3 d,终日提早约7.6 d,雪期缩短约13.8 d;海拔每升高100 m,初日提早约3.3 d;终日推迟约4.0 d,雪期缩短约7.3 d。本研究为降雪预报提供了参考依据,同时对防御雪灾、科学利用降雪资源、保护生态环境和促进区域经济发展等有重要意义。
英文摘要:
      Using daily snowfall data and air temperature observation data from five meteorological stations in Shiyang River Basin during 1960-2017, temporal and spatial change characteristics of snowfall first and last date and snowfall period and relationships between they and air temperature and altitude were analyzed with climate diagnosis analysis method in Shiyang River Basin. The result showed that snowfall first date is earlier in mountain area(September 6th), followed by plain area(October 25th), finally in desert area(November 1th); and snowfall last date is later in mountain area(June 12th), followed by plain area(April 16th), finally in desert area(April 4th); and snowfall period is longer in mountain area(279 d), followed by plain area(172 d), finally in desert area(155 d). Snowfall first and last date and snowfall period have certain abnormal locally, and normal year probabilities of snowfall first and last date and snowfall period are all over 67%. Year and age snowfall first date assumes delayed trend, and the climatic tendency rate is from 0.844 to 3.101 d/10 a; snowfall last date assumes early trend(except Liangzhou and Gulang), and the climatic tendency rate is from -3.702 to 1.604 d/10 a; snowfall period assumes short trend, and the climatic tendency rate is from -7.447 to -0.097 d/10 a. There are extremely significant correlations between snowfall first and last date and snowfall period and air temperature and altitude, snowfall first date will delay about 6.3 d and snowfall last date will about 7.6 d ahead of time and snowfall period will shorten about 13.8 d for 1 degree centigrade increase of air temperature; snowfall first date will about 3.3 d ahead of time and snowfall last date will delay about 4.0 d and snowfall period will extend about 7.3 d for 100 m increase of altitude. The study provides a reference for snowfall forecast, and it is of great significance for defending snow disasters, scientifical utilizing snowfall resources, protecting ecological environment and promoting local economic development.
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