| 中国西北降水年内非均匀性特征分析 |
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| 引用本文： | 杨金虎,王鹏祥,白虎志,杨启国,韩树林.中国西北降水年内非均匀性特征分析[J].气候变化研究进展,2007,3(5):276-281. |
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| 作者姓名： | 杨金虎 王鹏祥 白虎志 杨启国 韩树林 |
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| 作者单位： | 甘肃省定西市气象局 |
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| 基金项目： | 科技部社会公益研究项目;甘肃省干旱气象科学研究项目 |
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| 摘 要： | 基于中国西北五省（区）1960-2004年112个台站逐日降水资料，通过表征时间分配特征的新参数—集中度和集中期，对西北地区年降水的年内集中特征进行了分析，结果表明：中国西北年降水集中度和集中期的空间分布存在很大的差异；中国西北年降水集中度东、西部表现出反向变化趋势，而降水集中期南、北部表现出反向变化趋势；年降水集中度与集中期同年降水量之间存在较好的相关性；另外年降水集中度与集中期同夏季北极涛动和东亚夏季风在年代际尺度上也存在很好的相关性。
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| 关 键 词： | 中国西北 降水集中度 降水集中期 非均匀性 |
| 文章编号： | 1673-1719（2007）05-0276-06 |
| 收稿时间： | 2006-11-30 |
| 修稿时间： | 2006-11-30 |
AIntra-annual Inhomogeneity Characteristics of Precipitation over Northwest China |
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| Yang Jinhu,Wang Pengxiang,Bai Huzhi,Yang Qiguo,Han Shulin.AIntra-annual Inhomogeneity Characteristics of Precipitation over Northwest China[J].Advances in Climate Change,2007,3(5):276-281. |
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| Authors: | Yang Jinhu Wang Pengxiang Bai Huzhi Yang Qiguo Han Shulin |
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| Institution: | 1 Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climate Change and Disaster Reduction of Gansu Province, Key Laboratory of Arid Climate Change and Disaster Reduction of China Meteorological Administration, Lanzhou 730020, China; 2 Meteorological Office of Dingxi, Dingxi 743000, Gansu, China; 3 Meteorological Office ofTongwei, Tongwei 743300, Gansu, China |
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| Abstract: | Based on 112 stations daily precipitation data in Northwest China from 1960 to 2004 ,concentrated characteristics of precipitation were analyzed by using definitions of concentration degree and concentration period in Northwest China. The results show that spatial distributions of both precipitation concentration degree (PCD) and precipitation concentration period (PCP) exist significant differences in Northwest China. It is proved that PCD shows an opposite change tendency in the east to the west of Northwest China,and PCP shows an opposite change tendency in the south to the north of Northwest China. It is also found that there are better correlation between PCD,PCP and the East Asia summer monsoon,summer Arctic oscillation on inter-decadal scale,respectively. |
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| Keywords: | Northwest China precipitation concentration degree precipitation concentration period inhomogeneity |
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