Pattern Classification of Heavy Rainfall in Jianghuai Region and Associated Circulations

Newly reconstructed dataset of regional historical heavy rain events, daily rainfall data of 2474 observational stations in China and NCEP/NCAR reanalysis data during 1981-2016, 1-10d rainfall products of 2016 from ECMWF and T639 models are used to study heavy rainfall events in Jianghuai Region.Fir...

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Bibliographic Details
Published inYing yong qi xiang xue bao = Quarterly journal of applied meteorology no. 4
Main Authors Tan, Guirong, Fan, Yiyuan, Niu, Ruoyun
Format Journal Article
LanguageChinese
Published Beijing China Meteorological Press 01.01.2018
Subjects
Anomalies
Atmospheric precipitations
Circulation
Circulation patterns
Circulation types
Classification
Coefficients
Correlation coefficient
Correlation coefficients
Daily precipitation
Daily rainfall data
Divergence
Fields
Heavy rainfall
Height
Jet stream
Jet streams (meteorology)
Lead time
Meridional circulation
Meridional wind
Methods
NCEP/NCAR reanalysis
Orthogonal functions
Pattern classification
Prophase
Rain
Rainfall
Rainfall patterns
Relative humidity
Ridges
Rivers
Troughs
Wind
Zonal winds
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Summary:Newly reconstructed dataset of regional historical heavy rain events, daily rainfall data of 2474 observational stations in China and NCEP/NCAR reanalysis data during 1981-2016, 1-10d rainfall products of 2016 from ECMWF and T639 models are used to study heavy rainfall events in Jianghuai Region.Firstly, typical rain patterns are refined by empirical orthogonal function(EOF) based on 72 heavy rainfall cases. And then the classification of the regional heavy rainfall patterns for all heavy rainfall cases is done objectively through taking corresponding circulation patterns of basic rain patterns as targets with an analogue method.Furthermore, circulation characteristics of heavy rainfall patterns in Jianghuai Region are investigated. From the prophase of heavy rainfall at 500hPa height fields, for Type Q_Ⅰ there is an enhancing large low vortex and it splits into two centers forming a circulation type of two troughs and one ridge, with marked anomalies but small amplitudes at low latitudes near Jianghuai Regio
ISSN:1001-7313