| 中国东部夏季持续性降水日变化在淮河南北的差异分析 |
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| 引用本文： | 原韦华,宇如聪,傅云飞.中国东部夏季持续性降水日变化在淮河南北的差异分析[J].地球物理学报,2014,57(3):752-759. |
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| 作者姓名： | 原韦华 宇如聪 傅云飞 |
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| 作者单位： | 1. 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室, 北京 100029;
2. 中国气象科学研究院灾害天气国家重点实验室, 北京 100081;
3. 中国科学技术大学地球和空间科学学院大气探测与气候环境实验室, 合肥 230026 |
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| 基金项目： | 国家自然科学基金(41205053和41221064);国家重点基础研究发展计划(2010CB951900);财政部/科技部公益性行业专项(GYHY201306068和GYHY201306016);水利部公益性行业专项经费项目(201301062)共同资助 |
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| 摘 要： | 本文利用1961-2006年我国285站观测的逐时降水数据，分析了中国东部不同地区夏季平均降水日变化随降水持续时间的变化特征. 虽然整个东部地区都表现为短时降水峰值较一致地出现在下午17时左右，持续较长时间降水在清晨前后发生峰值降水，但持续性降水日变化的平均峰值时间以淮河为界存在显著南北差异. 北部地区的持续性降水峰值主要出现在02-06时前后；南部地区的持续性降水峰值时间出现在06-10时. 无论是降水强度或频次的日变化峰值的南北差异均较明显，但降水强度差异更为突出，且主要表现在持续性强降水中. 进一步分析发现：一方面北部地区持续性强降水开始时间较南部地区更早；另一方面，北部地区降水从开始到峰值经历的时间更短. 最后，对持续性强降水峰值时间南北差异的可能原因进行了初步讨论.
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| 关 键 词： | 降水日变化 持续性降水 南北差异 |
| 收稿时间： | 2013-05-21 |
Study of different diurnal variations of summer long-duration rainfall between the southern and northern parts of the Huai River |
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| YUAN Wei-Hua,YU Ru-Cong,FU Yun-Fei.Study of different diurnal variations of summer long-duration rainfall between the southern and northern parts of the Huai River[J].Chinese Journal of Geophysics,2014,57(3):752-759. |
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| Authors: | YUAN Wei-Hua YU Ru-Cong FU Yun-Fei |
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| Institution: | 1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
2. LASW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, China;
3. School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Using the hourly rain gauge data of 285 stations from 1961-2006, the diurnal variations of rainfall with different duration time over the eastern China was studied. The short-duration rainfall over the whole eastern China presented peaks around 17 Beijing Time (BJT), but the peak time of long-duration rainfall exhibited significant regional differences. Long-duration rainfall over the northern (southern) parts of the Huai River showed the peaks during 02-06 (06-10) BJT. The regional differences existed in both rainfall frequency and intensity, but they were more obvious in the rainfall intensity especially for the long-duration heavy rainfall. Further analysis showed that the differences in rainfall peaks were contributed by the begin time of rainfall events and the time between the start and peak of rainfall jointly. Besides, the possible reasons, accounting for the different diurnal peaks of long-duration rainfall over the southern and northern parts of the Huai River, have also been discussed. |
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| Keywords: | Rainfall diurnal variation Long-duration rainfall Regional differences |
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