Winter Fog-haze over the Central Plains and Northern China Plain Associated With Atmospheric Circulation Anomaly in Northern Hemisphere
Wang Jie
Wang Jizhi
Wang Hong
Chen Huailiang
Yang Yuanqin
Zhang Meng
Abstract：Using the data of surface and upper air observations (pressure,temperature,humidity,wind,visibility and fog-haze weather phenomenon,etc.) during the years of 2000-2017 and NCEP reanalysis data in January for the years 1980-2016,based on index of climate anomaly circulation analyzing,the 3D-structures and its characteristics of general atmospheric circulation anomalies associated with typical high and low frequency years of winter fog-haze weather in the Northern China Plain has been studied.Results were as follows.The fog-haze days occurring in the Central Plains and Northern China Plain winter showed an increasing trend in January for the years 2000-2017,the correlation coefficient was 0.36,exceeded 0.001 of the significant level.Analyses based on an average climate state indicated that the general atmospheric circulation anomalies distribution in the more haze years and less haze years are significantly different.During the high frequency fog-haze years,the geopotential height anomaly in the mid-upper troposphere showed a pattern of "high-low-high" anomaly distribution occurred in January cold air path from the polar regions of Tamil peninsula,across the Lake Baikal in central Siberia,to the area of the East of China,and in the lower troposphere showed a pattern of "east high-west low".During the low frequency fog-haze years,this distribution pattern did not exist,and showed an anti-phase character.The anomaly pattern during high frequency fog-haze years could provide a favorable climate background and was an important cause of the frequent occurrences of fog-haze events in the Central Plains and Northern China Plain.
Keywords：Central Plains and Northern China Plainwinter fog-hazenorthern hemisphere circulation3 D circulation in troposphere" high-low-high" anomaly pattern
Publication Date：2017-10-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 1-8 )