辽宁长历时强降水的环境特征分析
投稿时间: 2016-11-22  最后修改时间: 2016-12-29  点此下载全文
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作者单位E-mail
陈传雷 辽宁省气象灾害监测预警中心 ln_ccl@163.com 
中文摘要:利用NCEP1°×1°格点再分析、FY-2E相当黑体亮温 TBB和地面加密自动气象站等资料,分析了辽宁3次典型长历时强降水TBB值与降水强度的关系、中尺度环境场特征及维持机制,并初步建立了辽宁长历时强降水概念预报模型。结果表明:在副热带高压的形态、位置和强度有利于辽宁产生强降水的大尺度形势下,副热带高压西侧低空急流持续输送的充沛暖湿空气与高空干冷空气在同一地点长时间相互作用,为强降水的发生和维持提供了有利的环境背景。强降水持续时间与其上空的强垂直速度持续时间有很好的对应关系,强降水持续时高空一般为弱的不稳定或中性层结。强降水不仅可出现在对流云团发展旺盛的冷云区内部或边缘,也可发生在TBB值较小的暖云区内,TBB值的大小与降水强度没有必然的关系,但TBB值的快速减小都预示强降水即将发生,这些结论有利于深化认识辽宁地区长历时强降水的成因并为预报提供线索。
中文关键词:长历时  强降水  环境特征  TBB
 
Characteristics of environmental circulations of Long Duration Heavy Precipitation in Liaoning Province
Abstract:his study analyzes three long duration heavy precipitation in Liaoning using NCEP1°×1°grid reanalysis data, FY-2E infrared 0.1°×0.1°TBB data and automatic weather station data. The analysis covers the relationship between TBB and precipitation as well as mesoscale environmental field characteristics and maintenance mechanism. Sustainable conceptual forecasting model in Liaoning is initially established. The results demonstrate that: A favorable environmental background for heavy precipitation is provided by the interaction between the humid warm air transferred by low-level jet of west subtropical high pressure and dry cold upper air when the shape, location and intensity of subtropical high pressure are conducive to heavy rain in Liaoning in large-scale situation. The time length of vertical movement has good correspondence with the duration of heavy rainfall and it is generally weak or unstable stratum during long-lasted high strength precipitation. The strong precipitation can occur not only in the inner or edge of the cool cloud area but also in the warm cloud area where the TBB value is small. The TBB value is not necessarily related to precipitation intensity, but the rapid decrease of TBB value indicates imminent heavy rainfall, These conclusions are helpful to deepen the understanding of the cause of the long lasting precipitation in the Liaoning area and provide clues for forecasting.
keywords:Long Duration  Heavy Precipitation  Environmental characteristics  TBB
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