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气象:2006,32(3):32-38
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黄河宁蒙河段凌汛特征及成因分析
(1.国家气象中心,北京 100081;2.西藏自治区气象台)
Characteristics and Causes of Ice Flood in Ningxia-Inner Mongolia Section of the Yellow River Valley
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投稿时间:2005-11-07    修订日期:2005-12-14
中文摘要: 利用NCEP1°×1°的6小时分析资料、常规气象观测资料和水文观测资料,对黄河上游宁夏和内蒙古河段封、开河期的凌汛灾害特征和成因进行了天气动力学和热力学综合分析。结果表明:宁蒙河段凌汛灾害是特定的气象、地理和水文条件所造成的;封河主要是在经向型、开河在纬向型的有利大尺度环流形势下,与冷暖空气的侵入、气温剧烈降升、大气与水体对流失热和增热密切相关;气温的变化取决于温度平流和非绝热因子的作用,冷暖空气的强弱则取决于涡度平流的作用。
Abstract:During the season when the river water freezes or the river ice melts, ice flood disaster usually occurs in Ningxia-Inner Mongolia section of the Yellow River valley. Based on the meteorological and hydrological observations and NCEP/NCAR 6h analysis dataset of 1°×1°, the characteristics and causes of the disaster are analyzed by thermodynamic and dynamic methods. The results indicate that the disaster occurs under some meteorological, geographical and hydrological conditions. The freeze-up/break-up is related closely to the cold/warm air incursion and abrupt decreasing/increasing of temperature under advantageous large-scale circulation. The temperature advection and diabatic factor have an effect on the temperature change, while the intensity of the cold/warm air depends on the vorticity advection.
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引用文本:
王文东,张芳华,康志明,罗金秀,陈涛,杨克明,2006.黄河宁蒙河段凌汛特征及成因分析[J].气象,32(3):32-38.
,2006.Characteristics and Causes of Ice Flood in Ningxia-Inner Mongolia Section of the Yellow River Valley[J].Meteor Mon,32(3):32-38.