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Weakening of Winter North Atlantic Oscillation Signal in Spring Precipitation over Southern China 被引量:3
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作者 ZHOU Bo-Tao 《Atmospheric and Oceanic Science Letters》 CSCD 2013年第5期248-252,共5页
In this study,the relationship between the North Atlantic Oscillation (NAO) in winter (DecemberFebruary) and the precipitation over southem China (SCP) in the following spring (March-May) was investigated.Resu... In this study,the relationship between the North Atlantic Oscillation (NAO) in winter (DecemberFebruary) and the precipitation over southem China (SCP) in the following spring (March-May) was investigated.Results showed an interdecadal change,from strong to weak connection,in their connection.Before the early 1980s,they were highly correlated,with a strong (weak) winter NAO followed by an increased (decreased) spring SCP.However,after the early 1980s,their relationship was weakened significantly.This unstable relationship may be linked to the climatological change of East Asian jet.Before the early 1980s,the wave train along the Asian jet propagated the NAO signal eastward to East Asia and affected local upper-tropospheric atmospheric circulation.A strong NAO in winter led to an anomalous anticyclonic circulation at the south side of 30°N in East Asia in spring,resulting in an increase of SCP.In contrast,after the early 1980s,the wave train pattern along the Asian jet extended eastward due to strengthening of the climatological East Asian jet.Correspondingly,the NAO-related East Asian atmospheric circulations in the upper troposphere shifted eastward,thereby weakening the linkage between the spring SCP and the winter NAO. 展开更多
关键词 North Atlantic Oscillation precipitation over southern china interdecadal change
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CLIMATOLOGICAL CHARACTERISTICS OF SPRING PRECIPITATION OVER SOUTHERN CHINA AND ITS INTRASEASONAL OSCILLATION 被引量:1
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作者 潘蔚娟 李春晖 蒋承霖 《Journal of Tropical Meteorology》 SCIE 2016年第2期233-242,共10页
Based on observations and reanalysis data,the characteristics of the evolution of climatological spring precipitation over Southern China(SPSC) and the associated climatological intraseasonal oscillation(CISO) and atm... Based on observations and reanalysis data,the characteristics of the evolution of climatological spring precipitation over Southern China(SPSC) and the associated climatological intraseasonal oscillation(CISO) and atmospheric circulation are studied.Results show that SPSC increases in an oscillatory way.Although the evolution of SPSC is similar in different regions,there are also differences.In different regions of Southern China,the onset dates of the rain season are from the 12 th to 24 th pentad and the peak dates are after the 20 th pentad.CISO is an important component of SPSC,which is not only statistically significant,but also accompanies a dynamically coherent structure.The peak wet/dry phase of each CISO cycle corresponds to a significant rainfall increasing/decreasing period and modulates the evolution of SPSC.The rainfall growth in the second half of March and mid-April is the result of the modulation.The wet/dry phase of CISO is accompanied by low-level convergent(upper-level divergent) and cyclonic(anti-cyclonic) circulation,which favors ascending motion to develop over Southern China. 展开更多
关键词 spring precipitation over southern china wavelet analysis climatological intraseasonal oscillation
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