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Spatial Propagation of Different Scale Errors in Meiyu Frontal Rainfall Systems

Acta meteorologica Sinica 2012年第2期26卷 129-146页

作者：杨舒楠谈哲敏 Key Laboratory for Mesoscale Severe Weather/Ministry of Education and School of Atmospheric SciencesNanjing University

The spatial propagation of meso-and small-scale errors in a Meiyu frontal heavy rainfall event,which occurred in eastern China during 4-6 July 2003,is investigated by using the mesoscale numerical model *** general,the spatial propagation of simulated errors depends on their horizontal ***-scale（L 〈 100 km） initial error may spread rapidly as an isotropic circle through the sound ***,many scattered convection-scale errors are triggered in moist convection zone that will spread abroad through the isotropic,round-shaped sound wave further *** to the evolution of the rainfall system,several new convection-scale errors may be generated continuously by moist convection within the propagated round-shaped *** the above circular process,the small-scale error increases in amplitude and grows in scale ***（100 km 〈 L 〈 1000 km） initial error propagates up-and down-stream wavelike through the gravity wave,meanwhile migrating down-stream slowly along with the rainfall system by the mean *** up-stream propagation of the mesoscale error is very important to the error growth because it can accumulate error energy locally at a place where there is no moist convection and far upstream from the initial perturbation *** moist convection plays an important role in the rapid growth of errors,it has no impact on the propagation of meso-and small-scale *** diabatic heating could trigger,strengthen,and promote upscaling of small-scale errors successively,and provide ＂error source＂ to error growth and *** rapid growth of simulated errors results from both intense moist convection and appropriate spatial propagation of the errors.

关键词： initial error spatial propagation upscale growth moist convection Meiyu frontal rainfall

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