Plateau Meteorology

Plateau Meteorology >

2015 , Vol. 34 >Issue 1: 173 - 182

DOI: https://doi.org/10.7522/j.issn.1000-0534.2013.00157

Characteristics and Causes of High-Impact Weathers in the Yangtze River Delta

  • SHI Jun ,
  • CHEN Bomin ,
  • MU Haizhen ,
  • LIANG Ping
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  • Shanghai Climate Center, Shanghai 200030, China

Received date: 2013-05-20

  Online published: 2015-02-28

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Abstract

Based on the observed data from 32 meteorological stations, atmospheric circulation data and regional land use data, the evolution characteristics of high-impact weathers and the impacts of atmospheric circulation and regional urbanization and land use on them were analyzed. The results indicate that from 1959 to 2010, the decrease of low temperature, thunderstorm, strong wind, fog, snowfall and tornado days are all statistically significant, and the increase of high temperature and rainstorm days are statistically insignificant in the Yangtze River Delta. Meanwhile, the snowfall, fog, thunderstorm and low temperature had one decreased climatic jump change, but the high temperature and rainstorm days had one increased climatic jump change. Spatially, thunderstorm and strong wind days have decreased significantly in the whole Yangtze River Delta. Low temperature days have decreased significantly in the northern and middle parts, and snowfall days have decreased significantly in the eastern and southern parts of the Yangtze River Delta. High temperature days have increased significantly only in Nantong, Shanghai, Hangzhou Bay area and the eastern parts of Zhejiang. The spatial trend of rainstorm and tornado days is insignificant in the whole region, and the trend of fog days is more local. In the past 52 years, western Pacific subtropical high and northern hemisphere annular mode or arctic oscillation has increased, and polar vortex in northern hemisphere and Eurasian meridional circulation has decreased. The combined action from these atmospheric circulation systems has result in the decrease of strong wind, low temperature and snowfall days and the increase of high temperature days in the Yangtze River Delta. Urbanization and land use change have also resulted in the increase of high temperature days and the decrease of fog and strong wind days to some extent in the Yangtze River Delta.

Key words： High-impact weather; Characteristic; Atmospheric circulat; Urbanization; Yangtze River Delta

Cite this article

SHI Jun , CHEN Bomin , MU Haizhen , LIANG Ping . Characteristics and Causes of High-Impact Weathers in the Yangtze River Delta[J]. Plateau Meteorology, 2015 , 34(1) : 173 -182 . DOI: 10.7522/j.issn.1000-0534.2013.00157

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