| 东北冷涡降水集中期的客观识别研究 |
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| 引用本文： | 房一禾,龚志强,陈海山.东北冷涡降水集中期的客观识别研究[J].气象,2016,42(1):80-88. |
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| 作者姓名： | 房一禾 龚志强 陈海山 |
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| 作者单位： | 南京信息工程大学气象灾害预报预警与评估协同创新中心，气象灾害教育部重点实验室，南京 210044；沈阳区域气候中心，沈阳 110166；南京信息工程大学大气科学学院，南京 210044,国家气候中心，中国气象局气候研究开放实验室，北京 100081,南京信息工程大学气象灾害预报预警与评估协同创新中心，气象灾害教育部重点实验室，南京 210044；南京信息工程大学大气科学学院，南京 210044 |
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| 基金项目： | 辽宁省气象局科学技术研究项目(201502)、辽宁省科技厅农业攻关及产业化项目(2015103038)、公益性行业（气象）科研专项 (GYHY201306049和GYHY201306050)共同资助 |
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| 摘 要： | 基于区域关键天气过程客观化识别和监测的需求及东北雨季应包括冷涡降水的事实,采用东北三省及内蒙古东四盟共147站逐日降水量资料,通过对东北区域多年平均5点平滑处理的逐日降水量序列的综合分析及对历年逐日滑动平均雨量的对比试验,确定了判别东北冷涡降水集中期开始日期的阈值及持续时间,进而研制了东北冷涡降水集中期开始日期的客观识别方法。基于该方法的客观识别,得到1981-2010年气候平均态的东北冷涡降水集中期的开始日期为每年的5月26日。同时,定义盛夏降水集中期开始日的前一日为冷涡降水集中期的结束日期,发现冷涡降水集中期的结束日期为6月25日。在此基础上,采用NCEP/NCAR逐日再分析的风场、位势高度场资料,通过对东北冷涡降水集中期前、中和后期各层大气环流场及各系统的逐日变化特征的对比分析,验证了该客观识别方法的合理性。
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| 关 键 词： | 东北冷涡， 降水集中期， 开始日期， 客观识别 |
| 收稿时间： | 2014/12/23 0:00:00 |
| 修稿时间： | 2015/8/18 0:00:00 |
Objective Identification Research on China Northeast Cold Vortex Precipitation Period |
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| FANG Yihe,GONG Zhiqiang and CHEN Haishan.Objective Identification Research on China Northeast Cold Vortex Precipitation Period[J].Meteorological Monthly,2016,42(1):80-88. |
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| Authors: | FANG Yihe GONG Zhiqiang and CHEN Haishan |
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| Abstract: | Based on the requirement of objective identification and monitoring to key weather process, and the fact that the rainy season of Northeast China includes cold vertex precipitation, and using the daily precipitation data of 147 observing stations in Northeast China, this paper comprehensively analyzed the daily precipitation series disposed by 5 d moving average. Also, the contrast test of the daily moving average precipitation in the former years was designed. The threshold,duration as well as the criterion of onset and end dates cold vortex precipitation period in the Northeast China were confirmed. Then, based on the NCEP/NCAR daily reanalysis data of wind field and geopotential height field, the atmospheric circulation fields at different levels before, during and after the cold vortex precipitation period were analyzed, and the rationality of the criterion was validated. The objective identification method shows that the average onset date of the cold vortex r precipitation period in Northeast China is 26 May. The analysis of midsummer precipitation period reveals that the average end date of the cold vortex precipitation period is 25 June. |
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| Keywords: | Northeast China cold vortex precipitation duration onset date objective identification |
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