Relationship between Meiyu in mid- and low-reaches of the Yangtze River and global atmospheric circulation is investigated using ECMWF's geopotenhal height data. It is shown that Meiyu is associated not only with the circulation of the Northern Hemisphere (especially Eutssia), but also with the contemporaneous and previous circulation of the Southern Hemisphere to a high degree. It is found that if the meridional circulation develops in February over the mid- and high-latitudes of the South Indian ocean, there tends to be more rain during following Meiyu preiod in mid- and low-reaches of the Yangtze River. In addition, Meiyu is related to the intensity of the South Pole vortex to some degree.
Chinese Journal of Atmospheric Sciences