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| 三江源地区近50年降水变化分析 | |
| 引用本文： | 唐红玉,杨小丹,王希娟,史津梅,徐亮.三江源地区近50年降水变化分析[J].高原气象,2007,26(1):47-54. |
| 作者姓名： | 唐红玉 杨小丹 王希娟 史津梅 徐亮 |
| 作者单位： | 1. 青海省气象台,青海,西宁,810001;中国气象局,气候研究开放实验室,北京,100081 2. 中国气象局,国家气象中心专业气象台,北京,100081 3. 青海省气象台,青海,西宁,810001 |
| 基金项目： | 中国科学院知识创新工程项目 |
| 摘 要： | 利用西北及三江源(黄河、金沙江及澜沧江)地区122个气象观测台站1956—2004年近50年的逐日降水量及月总降水量资料,分析了三江源地区降水变化特征。结果表明:近50年来三江源地区的年降水量呈减少趋势,减少幅度为6.73mm/10a;降水日数的趋势变化呈较为明显的减少趋势,递减率为2.7d/10a;平均降水强度总体呈弱的增强趋势,增强速率平均为0.20mm/d/10a,增强幅度比中国西北地区平均水平强;从4~9月最长无降水日数趋于增长反映出西北地区干旱化的趋势。 |
| 关 键 词： | 三江源区 降水变化 降水日数 |
| 文章编号： | 1000-0534（2007）01-0047-08 |
| 修稿时间： | 2005-11-112006-04-24 |
Analyses of Precipitation Change in the Source Regions of Three Rivers during 1956-2004 |
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| TANG Hong-yu,YANG Xiao-dan,WANG Xi-juan,SHI Jing-mei,XU Liang.Analyses of Precipitation Change in the Source Regions of Three Rivers during 1956-2004[J].Plateau Meteorology,2007,26(1):47-54. | |
| Authors: | TANG Hong-yu YANG Xiao-dan WANG Xi-juan SHI Jing-mei XU Liang |
| Institution: | 1. Qinghai Meteorological Bureau, Xining 810001, China; 2. LCS China Meteorological Administrations, Beijing 100081, China ; 3. Profession Meteorological Station, China Meteorological Administration, Beijing 100081, China |
| Abstract: | Based on the daily precipitation data from 122 stations in Northwest China and source regions of three rivers(Yellow river,Jinsha river and Lanchang river) during 1956-2004,the spatial and temporal distributionsof trend for precipitation total,precipitation frequency and precipitation intensity are analyzed.The main conclusionsare summarized as follows: The annual precipitation in the source regions of the three rivers has decreased by a rate 6.73 mm/10a;and the daily numbers of precipitation has obviously decreased trend,successive decrease rate is 2.7 d/10a;the mean pricipitation intensity appear to weakly strengthen trend,mean speed is 0.20 mm/d/10a.Such change trends are stronger than mean pricipitation in Northwest China.The decreasing of the longest consecutivedry days reflectsa drying trend in the source regions of three rivers. |
| Keywords: | Source regions of the three rivers Precipitation changes Daily numbers of precipitation |
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