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气象:2012,38(6):679-687
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一次大范围辐射雾天气过程的观测和数值模拟分析
(1.湖南省邵阳市气象台,邵阳 422000;2.湖南省气象局,长沙 410007;3.湖南省常德市气象台,常德 415000)
Observations and Numerical Simulation of a Wide Range of Radiation Fog
(1.Shaoyang Meteorological Observatory of Hunan Province, Shaoyang 422000;2.Hunan Provincial Meteorological Service, Changsha 410007;3.Changde Meteorological Observatory of Hunan Province, Changde 415000)
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投稿时间:2011-06-01    修订日期:2011-08-13
中文摘要: 利用观测资料分析2010年1月华中一次大范围辐射雾过程的环流背景及气象要素分布特点。发现:本次大雾过程有两层较明显的逆温层,高空系统性偏北气流形成下沉逆温,位于700 hPa附近,使大气层结维持稳定,低层水汽不能上传,为大雾生成提供高湿环境条件;地面辐射冷却作用形成近地辐射逆温层,是辐射雾形成和发展的主要因素,而日出后太阳短波辐射对地面的加热和热量湍流输送是白天辐射雾消散的重要原因。利用WRF模式进行模拟实验,发现用T213资料作为模式的初始和边界条件模拟近地层气象要素,较NCEP再分析资料有一定优势;900 m以下U大值区与最大逆温≥5℃重叠区与雾区对应较好;河流湖泊北侧在地面由高压脊转高压后部后,在低空偏南气流水汽输送作用下,出现辐射雾转平流雾可能性较大;WRF模式模拟的近地面层要素结果和实况有所差距,必须采用观测资料同化改进。
Abstract:The circulation background and characteristics of meteorological element distribution are analyzed on a wide spread radiation fog that occurred in January 2010 over the Central China area. Observation and simulation of the wide spread radiation fog over Hunan are investigated by using a new generation of high resolution Weather Research and Forecasting (WRF) Model. The results show that there are two obvious inversion layers occurring in the evolution process of the radiation fog. One is the subsidence inversion formed by the high altitude systemic northerly airstream, which is located near 700 hPa with the stable atmospheric stratification, and thus low level water vapor can not be propagated upward, and therefore provides high humidity conditions for the fog formation. The other is the radiation inversion formed from the surface cooling effect of radiation, which is the main factor for the formation and development of this fog. However, for the dissipation of the fog the main cause is the surface heating by solar shortwave radiation after sunrise and heat transportation. In addition, it shows that there are better simulation results by using WRF model when T213 data are used as the initial conditions instead of NCEP reanalysis. The overlap zone of the maximum U value below 900 m with large inversion ≥ 5℃ corresponds well with the fog. At the north of the rivers and lakes, moreover after high ridge changed into high rear sector near the surface, the advection fog appears likely due to the effect of water vapor transport by low level southerly flow. There is a gap of the near surface layer of elements between the simulation from WRF model and observations, and the assimilation of observation data must be considered in the simulation.
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基金项目:中国气象局2011年气象关键技术集成与应用(CMAGJ2011M35)项目资助
引用文本:
彭双姿,刘从省,屈右铭,姚蓉,唐杰,田泽芸,2012.一次大范围辐射雾天气过程的观测和数值模拟分析[J].气象,38(6):679-687.
PENG Shuangzi,LIU Congsheng,QU Youming,YAO Rong,TANG Jie,TIAN Zeyun,2012.Observations and Numerical Simulation of a Wide Range of Radiation Fog[J].Meteor Mon,38(6):679-687.