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中国沙漠 ›› 2013, Vol. 33 ›› Issue (3): 874-881.DOI: 10.7522/j.issn.1000-694X.2013.00124

• 天气与气候 • 上一篇    下一篇

基于图形分析的宁夏春季干旱监测预测方法研究

邵 建1,2, 胡文东1, 冯建民1, 杨有林1,2, 李艳春1,2   

  1. 1.宁夏气象科学研究所 宁夏气象防灾减灾重点实验室, 宁夏 银川 750002;
    2.宁夏气象台, 宁夏 银川 750002
  • 收稿日期:2012-11-16 修回日期:2012-12-23 出版日期:2013-05-20 发布日期:2012-12-23

A Monitoring and Predicting Method of Spring Drought in Ningxia of China Based on Graph Recognition Technique

SHAO Jian1,2, HU Wen-dong1 , FENG Jian-min1, YANG You-lin1,2, LI Yan-chun1,2   

  1. 1.Ningxia Key Laboratory of Meteorological Disaster Prevention and Mitigation, Ningxia Institute of Meteorological Science, Yinchuan 750002, China;
    2.Ningxia Meteorological Observatory, Yinchuan 750002, China
  • Received:2012-11-16 Revised:2012-12-23 Online:2013-05-20 Published:2012-12-23

摘要:

利用NCEP/NCAR再分析春季逐月平均位势高度、风、温度、垂直速度等物理量的格点资料,通过图形分析技术进行天气系统识别,建立3类宁夏春季干旱多层次环流概念模型,并对各类型主要影响因子进行特征量对比计算,得出了宁夏春季干旱监测预测定量化指标。在如下条件下,宁夏易发生春季干旱:(1)500 hPa东亚大槽位于120°—140°E,其中位于120°—130°E间时发生的干旱强度最大,偏东或偏西则强度减弱;(2)500 hPa中亚脊强盛、完整且位于60°—100°E,位于80°E附近干旱强度最大,弱脊分裂或偏西则干旱强度较弱;(3)副热带高压呈带状,脊线位于20°N以南且西脊点位于110°E以西时;(4)850 hPa偏南气流强度较弱,北界位于27°N以南时;(5)700 hPa判定区域(30°—50°N、90°—110°E)内干区控制范围比率达45%时;(6)500 hPa判定区域(30°—50°N、90°—110°E)内下沉气流区占区域面积的比率≥75%,700 hPa下沉气流区占区域面积的比率≥60%,且宁夏北部受下沉气流区控制。利用图形分析法对宁夏春季干旱进行监测预测,对2010年和2011年春季气候趋势进行拟合检验,效果良好。

关键词: 干旱, 图形分析, 影响因子自动判别, 监测预测方法, 宁夏

Abstract:

Three kinds multi-level atmospheric circulation conceptual model of spring drought in Ningxia were established, and monitoring and predicting quantitative indices were studied based on the NCEP/NCAR reanalysis monthly data sets, through technology of weather system identification and other graphic analysis methods. And the monitoring and forecasting quantitative indices of Ningxia spring drought were given here. Spring drought in Ningxia occurs under following conditions: (1) East Asia Trough at 500 hPa is over 120—140 °E , and the drought is the most serious when the trough is over 120°-130°E; (2) The whole Central Asia Ridge at 500 hPa is over 60°-100°E, especially when it is near 80°E; (3)The Subtropical High Pressure is in ribbon shape and the west ridge point extends to 110 °E; (4) Southern Air Stream at 850 hPa is weak, and its north side stretches to 27 °N; (5) Dry area occupies more than 45% of the key area (90°-110°E, 30°N to 50°N) at 700 hPa; (6)Downdraft at 500 hPa (700 hPa) occupies more than 75%(60%) of the key area (90°-110°E, 30°-50°N), and the northern Ningxia is controlled by downdraft. Meteorological data analysis showed that spring droughts in Ningxia in 2010 and 2011 were well predicted by weather system identification technology.

Key words: drought, graph recognition, auto-discrimination, monitoring and predicting method, Ningxia

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