| 1991年5-7月江淮洪涝:水汽和冷空气的作用比较 |
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| 引用本文： | 姜颖,陆尔.1991年5-7月江淮洪涝:水汽和冷空气的作用比较[J].气象科学,2016,36(3):382-388. |
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| 作者姓名： | 姜颖 陆尔 |
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| 作者单位： | 南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044,南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044;NOAA Climate Prediction Center, College Park, Maryland, USA |
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| 基金项目： | 国家自然科学基金资助项目（41275092、41230528）、江苏高校优势学科建设工程资助项目（PAPD） |
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| 摘 要： | 对1991年5-7月江淮流域持续性暴雨的环流异常进行分析，比较造成此次洪涝的水汽输送和冷空气活动重要性。结果表明：（1）东亚大槽维持在中国东北上空发展明显，同时鄂霍次克海上空没有建立强大阻高，这种形势有利于冷空气持续向南侵袭，盛行经向环流。此外，低纬度地区，西太平洋副热带高压主体位置于常年同期相比，明显偏西、偏强，有利于暖湿气流沿副热带高压北上到达江淮流域，与北方冷空气辐合形成强降水。（2）通过定义IT和Iq分别表征温度与水汽对降水的贡献，发现此次江淮流域地区强降水是由对流层低层水汽异常增多和气温异常偏低共同造成的，作用基本相当。
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| 关 键 词： | 江淮流域 水汽 冷空气 旱涝 |
| 收稿时间： | 2014/10/26 0:00:00 |
| 修稿时间： | 2014/12/26 0:00:00 |
Comparison of the water vapor supply and cold air surges leading to the heavy rainfall over the Yangtze-Huaihe river basins during early summer in 1991 |
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| JIANG Ying and LU Er.Comparison of the water vapor supply and cold air surges leading to the heavy rainfall over the Yangtze-Huaihe river basins during early summer in 1991[J].Scientia Meteorologica Sinica,2016,36(3):382-388. |
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| Authors: | JIANG Ying and LU Er |
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| Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing, 210044, China and Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing, 210044, China;NOAA Climate Prediction Center, College Park, Maryland, USA |
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| Abstract: | The atmospheric circulation anomalies of the continuous heavy rainfall over Yangtze-Huaihe river basin from May to July in 1991 were analyzed, moreover, the roles of water vapor transmission and cold air activities leading to this heavy rainfall were also compared. Results show that the deeper East Asia trough upon Northeast China and the unconspicuous block over the sea of Okhotsk led the cold air southward during the heavy rainfall. And the obviously westward subject position of the stronger western Pacific subtropical high over low-level areas was favorable for the northward movement of the warm and humid airflow from the West Pacific to the Yangtze-Huaihe river basins and the convergence with cold air in North China, which caused the prosperous precipitation. The definition of Iq and IT found that the temperature and moisture had almost the equivalent effects in the lower troposphere. |
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| Keywords: | Yangtze-Hauihe river basins Water vapour Cold air Drought and flood |
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