| 西藏雅江中西段流域夏季降水量变化特征 |
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| 引用本文： | 次珍,尼玛吉,普布,丹增克珠.西藏雅江中西段流域夏季降水量变化特征[J].高原山地气象研究,2019,39(2):56-61. |
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| 作者姓名： | 次珍 尼玛吉 普布 丹增克珠 |
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| 作者单位： | 1. 西藏自治区拉萨市气象局, 拉萨 850001; |
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| 基金项目： | 中国气象局预报员专项项目(CMAYBY2019-112)西藏大学2018年中央支持地方高校改革发展资金项目-生态环境遥感与地理国情监测应用研究及服务平台建设拉萨市科技局重点项目(LSKJ2018009) |
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| 摘 要： | 利用西藏雅鲁藏布江流域6个代表站降水资料,研究了雅江流域近53年的夏季降水量变化特征。主要结论包括:1963~2014年雅江流域6个站各站年平均降水量在286.2~447.9mm,夏季(6~8月)平均降水量在221.4~355.4mm,占年降水量的71%~85.5%。年最大降水量出现在拉萨,其次是日喀则和泽当,位于雅江偏西段的定日和江孜降水量最少;夏季降水量空间分布特征与年降水量的分布特征基本一致。雅江流域年降水量存在显著的年际和年代际变化特征,降水总量呈增多趋势。夏季降水量对年总降水量的贡献最大,占年降水总量的77%。夏季(6~8月)降水量变化与年降水量的变化趋势一致,即总体呈增多趋势。拉萨、定日、日喀则、浪卡子夏季降水量的变化趋势与雅江流域整体趋势特征一致,其中拉萨最明显,而泽当和江孜降水量呈减少趋势。雅江流域夏季降水量在1998年出现了明显突变,21世纪以来的十几年内存在短时间的突变现象。雅江流域夏季降水量主要存在2~4a和7~8a的变化周期。
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| 关 键 词： | 雅江流域 夏季降水量特征 突变检验 小波分析 |
| 收稿时间： | 2019-04-28 |
The Characteristics of Variations in Summertime Precipitation in the Midwest Area of Yarlong Zangpo River Basin in Tibet |
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| Institution: | 1. Lhasa Meteorological Bureau, Lhasa 850000, China;2. Tibet Climate Center, Lhasa 850000, China |
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| Abstract: | By employing the precipitation observation from 6 representative stations (Lhasa,Shigatse,Zedang,Dingri,Jiangzi,and Langkazi) reanalysis datasets over the Yarlung Zangbo River Valley (YZRV) of Tibet province,China,we analyzed the characteristics of variations in summertime precipitation during 1963 to 2014.The main conclusions are as follows:From 1963 to 2014,the summer (JJA) precipitation from 6 stations spanned between 221.4 to 355.4 mm,accounting for 71%~85.5% of annual mean precipitation (between 286 and 447.9 mm).Among these stations,the Lhasa received the largest amount of precipitation annually,followed by the Shigatse and Zedang,while the Dingri and Jiangzi in the west reaches of Yarlung Zangbo River had the least annual mean precipitation;the spatial distribution of the summer precipitation is nearly the same as the annual mean.Generally,it showed an increasing trend with obvious inter-annual and inter-decadal variation characteristics of the annual precipitation over the entire YZRV region,among which summer precipitation contributed to most proportion (77%).And the variation of the summer precipitation (from June to August) indicated an increasing tendency in general,which is in line with the variation of the annual precipitation.It can be seen that the variation trend of summer precipitation in Lhasa,Dingri,Shigatse,and Langkazi is the same with the variation trend of the entire YZRV region,especially the variation trend in Lhasa,yet the variation trend in Zedang,Jiangzi showed an decreasing trend.The YZRV region had a significant abrupt change in 1998 in terms of annual mean precipitation,while during the 21st century,there was also short-time-period abrupt phenomenon.It observed that the variation period of summer precipitation in YZRV region were mainly 2~4a and 7~8a. |
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