Cause Analysis for Continuous Rain of Sanmenxia City in Late Summer and Early Autumn of 2014
Li Jingmei
Abstract：In this paper,the analysis was carried out for the circulation situation,physical quantity field to find out the main cause of the continuous rain weather during September 7-18,2014 by the method of statistic contrastive analysis and diagnostic analysis etc.The data of NCEP/NCAR 1 o x 1 ° 6 h,NCEP/NCAR 2.5° x 2.5° daily average reanalysis data,automatic station rainfall data was used.The result showed as follows.1) Going northwards and much stronger anomalously of South Asia high provided the favorable large-scale circulation conditions for this continuous rain process.2)The long-term stable maintenance of subtropical high was advantageous to reduce moving speed of low trough and shear line,and force the northwards transportation of warm-wet air flow.3) Urals high-pressure ridge was weaker than that in normal years,and was quite different with its abnormal stronger situations in common continuous rain weather.4)The coupling between stable subtropical upper-level jet stream and southwest lowlevel jet stream outside subtropical high provided continuous ascending motion and moisture convergence for continuous rain.5)It was not enough to generate sufficient water vapor for heavy rainfall,and there must also had obvious water vapor convergence in the transition zone of water vapor.6) The low-level strong vertical ascending motion effectively drived the development of storm rainfall during this continuous rain.
Keywords：continuous rainupper level jetlow level jetthe South Asian high
Publication Date：2017-04-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 115-119 )