| 华北夏季不同月份降水的年代际变化 |
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| 引用本文： | 陆日宇.华北夏季不同月份降水的年代际变化[J].高原气象,1999,18(4):509-519. |
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| 作者姓名： | 陆日宇 |
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| 作者单位： | 中国科学院大气物理研究所,北京,100080 |
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| 基金项目： | 中国科学院“九·五”重大应用基础研究项目 |
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| 摘 要： | 利用９５１年到１９９６年华北地区１７个站的月降水资料，分析了华北地区夏季各月降水的年代际变化特征，结果表明：６月降水量较少，且在年代际变化下没有表现出减少趋势；７月降水量较多，年代际变化较大，８０年代是少；８月的降水量在年代际变化上表现出线性减少的趋势并呈准１０年周期的振荡，７月和８月的降水量均在６０年代中期和从７０年代末到８０年代初有两次明显的减少。根据７、８月降水不同的年代际变化特征，我们利用
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| 关 键 词： | 华北降水 年代际变化 大气环流异常 |
| 修稿时间： | 1999-04-02 |
INTERDECADAL VARIATIONS OF PRECIPITATIONS IN VARIOUS MONTHS OF SUMMER IN NORTH CHINA |
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| LU Ri-yu.INTERDECADAL VARIATIONS OF PRECIPITATIONS IN VARIOUS MONTHS OF SUMMER IN NORTH CHINA[J].Plateau Meteorology,1999,18(4):509-519. |
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| Authors: | LU Ri-yu |
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| Abstract: | The features of interdecadal variations of precipitations in various months of summer in North China are analyzed by using the observed data of summer monthly precipitations from 1951 to 1996 at 17 stations in North China. It is shown that the precipitations in each month have different features. In North China, the precipitation in June was the smallest and does not exhibit a decreasing trend in the interdecadal variations,but the precipitation in July was the largest with a large interdecadal variability and reached its minimum in the 1980's. There are a linear decreasing trend and a quasi ten years oscillation in the interdecadal variations of precipitations in August. Both precipitations in July and August in North China remarkably decreased in the middle 1960's and at the end of 1970's.According to the different features of precipitations in July and August, the atmospheric circulation anomalies in the middle and high latitudes associated with the interdecadal variaitons of droughts and floods in North China are examined by using composite method. The analyzed results suggested that the interdecadal variations of precipitation in July not only were associated with the atmospheric circulation anomalies in July, but also had an important impact on the atmospheric circulation anomalies in August. In the relationship between the variations of summer precipitation in North China and the atmospheric circulation anomalies in the middle and high latitudes, the impact of the former on the latter may be more dominant. |
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| Keywords: | Precipitation Interdecadal variation Atmospheric circulation anomaly |
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