| 近50a西北干旱区降水量变化差异分析 |
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| 引用本文： | 任朝霞,杨达源.近50a西北干旱区降水量变化差异分析[J].干旱区资源与环境,2007,21(6):114-118. |
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| 作者姓名： | 任朝霞 杨达源 |
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| 作者单位： | 1. 长安大学地球科学与国土资源学院,西安,710054
2. 南京大学城市与资源学系,南京,210093 |
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| 摘 要： | 利用近50a西北干旱区21个代表站点的逐月降水量资料,通过逐月降水量趋势系数和对西北干旱区降水量变化贡献最大的月份的比较,深入分析近50a西北干旱区降水量变化的差异,从而得到以下结论:(1)降水量变化具有明显的季节差异。西北干旱区春季降水量变化较为复杂;夏季除了新疆西北部降水量减少趋势外,其他地区降水量都以增加为主;秋季形成了从南到北降水量依次增加的格局;冬季在新疆东部、南部和河西走廊的降水量有减少趋势,新疆西北部和柴达木盆地降水量以增加为主。(2)对夏半年降水量增加贡献最大的月份主要在7月,在新疆东部、南部和柴达木盆地。冬半年降水量增加贡献最大的月份主要在3月,在新疆西部、南部地区、河西走廊和柴达木盆地。
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| 关 键 词： | 西北干旱区 降水量变化 趋势系数分析 |
| 文章编号： | 1003-7578(2007)06-114-05 |
| 修稿时间： | 2006年4月18日 |
Diversity Analysis on Precipitation Variation in the Arid Region of Northwest China in Resent 50 Years |
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| REN Zhao-xia,YANG Da-yuan.Diversity Analysis on Precipitation Variation in the Arid Region of Northwest China in Resent 50 Years[J].Journal of Arid Land Resources and Environment,2007,21(6):114-118. |
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| Authors: | REN Zhao-xia YANG Da-yuan |
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| Abstract: | Based on the monthly precipitation data of 21 stations from 1951 to 2000,trend coefficient of monthly precipitation and maximal month contributing to precipitation variation was compared.Diversity of precipitation variation in the arid region of Northwest China resent 50 years was analyzed.The results showed that:(1)Precipitation variation was different from seasonal diversity.Precipitation variation was complicatedin springtime;precipitation tended to increaseexceptthe northwestern Xinjiang in summer;trend of precipitation increasing was from southeast to northwest in autumn;Precipitation tended to decrease in the eastern and southern Xinjiang and Hexi passageway,but precipitation tended to increase in the Chaidam Basin and northwestern Xinjiang.(2) Month maximal contributing to precipitation increased was July in summer half-year,distribution in the eastern and southern Xinjiang,Hexi passageway and Chaidam Basin.Month with maximal contributing to precipitation increased was March in winter half-year,distributing in the western and southern Xinjiang,Hexi passageway and Chaidam Basin. |
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| Keywords: | arid region of Northwest China precipitation variation trend coefficient analysis |
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