1998年长江中下游地区暴雨过程大气低频扰动场分析

doi:10.3969/j.issn.1673-503X.2016.04.003

Abstract

Abstract: The data of daily precipitation in the mid-lower reaches of the Yangtze River and the reanalysis data of NCEP/NCAR (National Centers for Environmental Prediction/National Center for Atmospheric Research) which have been treated with the physical decomposition on atmospheric variables were used to study the significant characteristics of the low-frequency atmospheric disturbances during heavy rainfall events in 1998 based on the methods of Morlet wavelet analysis and Lanczos band-pass filters.The results show that before August it is the precipitation high incidence period,especially for the rainstorms in the mid-lower reaches of the Yangtze River in 1998.There are two kinds of low-frequency oscillations during heavy rainfall events;the 12-24 days low-frequency oscillations (LFO) mainly occur from January to April,and the 30-60 days LFO usually occur from June to August.Heavy rainfall events during January to April in this region are related to the 12-24 days low-frequency disturbed cyclones (or anticyclones) at 850 hPa that move eastward from the Sichuan Basin vicinity in the east side of the Tibetan Plateau,while the heavy rainfall events during May to August are related to the 30-36 days low-frequency disturbed cyclones (or anticyclones) that move westward from the sea surface of the south of the Japan main island.The geopotential height field of the 12-24 days low-frequency disturbances shows a vertical baroclinic structure,and its central axis tilts towards the west,which is different from that of the 30-60 days low-frequency disturbances characterized by barotropicity.The strongest signals of 12-24 days low-frequency disturbances that cause the heavy rainfall from January to April in this region are located around 925-850 hPa and originate from the east side of the Tibetan Plateau and the mid-high latitudes,respectively.However,the strongest signals of 30-60 days low-frequency disturbances are mostly located around 850-500 hPa and are generated from the eastern and central parts of the Pacific Ocean and the near place of the equator,respectively.

Key words: Mid-lower reaches of the Yangtze River, Heavy rainfall, Band-pass filter, Physical decomposition of atmospheric variables, Low frequency disturbance

CLC Number:

LI Jin, DING Ting, SUN Lin-hai, QIAN Wei-hong. Analysis of low-frequency atmospheric disturbances over mid-lower reaches of the Yangtze River during heavy rainfall in 1998[J]. Journal of Meteorology and Environment, 2016, 32(4): 23-31.

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Analysis of low-frequency atmospheric disturbances over mid-lower reaches of the Yangtze River during heavy rainfall in 1998

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